{"id":17406,"date":"2017-05-03T10:13:29","date_gmt":"2017-05-03T10:13:29","guid":{"rendered":"https:\/\/rsgb.org\/main\/?page_id=17406"},"modified":"2022-02-01T10:21:39","modified_gmt":"2022-02-01T10:21:39","slug":"abbreviations-and-acronyms","status":"publish","type":"page","link":"https:\/\/rsgb.org\/main\/publications-archives\/radcom\/supplementary-information\/abbreviations-and-acronyms\/","title":{"rendered":"Abbreviations and acronyms"},"content":{"rendered":"

This is a non-exhaustive list of acronyms, abbreviations and conventions used in RadCom<\/em>.<\/strong><\/p>\n

At the bottom of the page you will also find some of the conventions used in GB2RS Local News and RadCom<\/em> Club Calendar plus an explanation of common symbols used in RadCom<\/em> and other RSGB publications.\u00a0Some of the definitions may vary slightly from those published elsewhere: the meanings listed here reflect their usage in RadCom<\/em>.<\/p>\n

(As time permits, I am slowly going through the list and adding links to relevant definitions and\/or organisations etc. Whilst many of the subjects, for example ARDF, are covered on the RSGB website I have elected to use Wikipedia as the primary reference source, at least for the initial run-through. The exception to this is organisations, such as ARRL, where I link to their home page. You’re welcome to open a discussion with me about this via the email address below. Giles, G1MFG, 29 July 2021)<\/em><\/p>\n

We welcome any suggested amateur radio-related additions to this list: if you would like to contribute new entries (or corrections), please email radcom@rsgb.org.uk with the subject line Acronyms and if possible format your additions as acronym <tab> expansion.<\/p>\n

 <\/p>\n

Abbreviations and acronyms list<\/strong><\/p>\n

Note: the abbreviations are capitalised correctly as they should appear and the expansions use capitals where they are properly required \u2013 eg<\/span><\/p>\n

k \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0kilo (multiplier, x 1,000)
\n<\/span>K \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0kelvin (temperature)
\n<\/span>RSGB\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Radio Society of Great Britain<\/span><\/p>\n

 <\/p>\n

A\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amp (ampere<\/a>)<\/p>\n

AC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 activity contest<\/p>\n

AC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0alternating current<\/a><\/p>\n

ADC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 analogue to digital converter<\/a><\/p>\n

ADIF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Amateur Data Interchange Format<\/a><\/p>\n

ADSL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 asymmetric digital subscriber line<\/a><\/p>\n

AF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 audio frequency<\/a> (about 20Hz to about 20kHz)<\/p>\n

AFS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Affiliated Society (contest)<\/a><\/p>\n

AGC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 automatic gain control<\/a><\/p>\n

AGL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 above ground level<\/a><\/p>\n

Ah \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 amp-hour<\/a> (eg battery capacity)<\/p>\n

ALC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0automatic level control<\/a><\/p>\n

ALE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 automatic link establishment<\/a><\/p>\n

AM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amplitude modulation<\/a><\/p>\n

AMBE\u00a0 \u00a0 \u00a0 \u00a0 Advanced Multi-Band Excitation<\/p>\n

AMBE+\u00a0 \u00a0 more advanced version of AMBE<\/p>\n

AMTOR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur teleprinting over radio<\/a><\/p>\n

AMU\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 antenna matching unit<\/a><\/p>\n

AOTA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Airfields on the Air<\/a><\/p>\n

APF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 all pass filter<\/a><\/p>\n

APRS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 automatic packet reporting system<\/a><\/p>\n

APSK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 amplitude and phase shift keying<\/a><\/p>\n

APT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 automatic picture transmission<\/a><\/p>\n

APT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Asia-Pacific Telecommunity<\/a><\/p>\n

ARA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur radio association<\/p>\n

ARC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur radio club<\/p>\n

ARDF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur radio direction finding<\/a><\/p>\n

AREDN \u00a0 \u00a0 \u00a0 \u00a0 Amateur Radio Emergency Data Network<\/a><\/p>\n

ARG\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur radio group<\/p>\n

ARI \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Associazione Radioamatori Italiani<\/em><\/a> (Italian national society)<\/p>\n

ARISS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Amateur Radio on the International Space Station<\/a><\/p>\n

AROS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Amateur Radio Observation Service (replaced by RSGB OAS<\/a>)<\/p>\n

ARRL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 American Radio Relay League<\/a><\/p>\n

ARS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur radio society<\/p>\n

AS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0aircraft scatter<\/a><\/p>\n

ASCII \u00a0 \u00a0 \u00a0 \u00a0 \u00a0American Standard Code for Information Interchange<\/a><\/p>\n

ASK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amplitude shift keying<\/a><\/p>\n

ASL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0above sea level<\/a><\/p>\n

ASTU\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 antenna system tuning unit<\/a><\/p>\n

ATA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0AT attachment (now PATA<\/a> (qv))<\/p>\n

ATC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Air Training Corps<\/a><\/p>\n

ATC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0air traffic control<\/a><\/p>\n

ATC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0amateur transmitting club<\/p>\n

ATNO\u00a0 \u00a0 \u00a0 \u00a0 all-time new one<\/a><\/p>\n

ATS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 amateur transmitting society<\/p>\n

ATT\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 attenuator (radio panel marking)<\/p>\n

ATU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0antenna tuning unit<\/a><\/p>\n

ATV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0amateur television<\/a><\/p>\n

Az \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 azimuth<\/a><\/p>\n

b \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0bit<\/a><\/p>\n

B \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0byte<\/a><\/p>\n

BARTG \u00a0 \u00a0 \u00a0 \u00a0 British Amateur Radio Teledata Group<\/a><\/p>\n

BATC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0British Amateur Television Club<\/a><\/p>\n

BC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0broadcast<\/a><\/p>\n

BCI \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 broadcast interference<\/p>\n

BEAMA \u00a0 \u00a0 \u00a0 \u00a0British Electrotechnical and Allied Manufacturers\u2019 Association<\/a><\/p>\n

BERU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 British Empire Radio Union (contest) (now known as the Commonwealth Contest<\/a>)<\/p>\n

BLM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Board liaison member<\/p>\n

BM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0balanced modulator or balanced mixer<\/a><\/p>\n

BNC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Bayonet Neill-Concelman<\/a> (connector)<\/p>\n

BPF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 band pass filter<\/a><\/p>\n

BPSK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 binary phase shift keying<\/a><\/p>\n

BT\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Bluetooth<\/a><\/p>\n

BT\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0British Telecom<\/a><\/p>\n

BVWS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0British Vintage Wireless Society<\/a><\/p>\n

BW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 bandwidth<\/a><\/p>\n

BWO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 backward-wave oscillator<\/a><\/p>\n

BWO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Bridge Wireless Office (eg aboard HMS Belfast<\/em>)<\/p>\n

C \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Celsius (centigrade)<\/p>\n

C \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 coulomb (unit of electric charge)<\/p>\n

C&G\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 City and Guilds<\/p>\n

CAN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0controller area network (bus)<\/p>\n

CAPEX \u00a0 \u00a0 \u00a0 \u00a0 capital expenditure<\/p>\n

CAR\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 carrier [level] (radio panel marking)<\/p>\n

CASHOTA \u00a0 \u00a0 Castles and Stately Homes on the Air<\/p>\n

CAT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0computer-assisted transceiver (or computer-aided)<\/p>\n

CATV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Community Access Television\u00a0(or\u00a0Community Antenna Television) (cable TV)<\/p>\n

CB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Citizen\u2019s Band<\/p>\n

CC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0club contest<\/p>\n

CC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Contest Committee<\/p>\n

CCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Commonwealth Century Club (operating award)<\/p>\n

CDXC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Chiltern DX Club<\/p>\n

CE \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0chip enable (control signal)<\/p>\n

CEPT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0European Conference of Postal and Telecommunications Administrations<\/p>\n

CFL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 compact fluorescent lamp<\/p>\n

CHU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Canadian government standard time station on 3330, 7850 and 14670kHz<\/p>\n

CIGR\u00c9\u00a0 \u00a0 \u00a0 \u00a0Conseil International des Grands R\u00e9seaux \u00c9lectriques<\/em> (Council for Large Electrical Systems)<\/p>\n

CITEL \u00a0 \u00a0 \u00a0 \u00a0Comisi\u00f3n Interamericana de Telecomunicaciones<\/i> (Inter-American Telecommunication Commission)<\/p>\n

CLAR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0clarifier (radio panel marking)<\/p>\n

CLK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0clock (control signal)<\/p>\n

cm \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 centimetre (0.01m)<\/p>\n

CMOS\u00a0 \u00a0 \u00a0 \u00a0complementary metal-oxide-semiconductor<\/p>\n

Codec2\u00a0 \u00a0 \u00a0 Family of audio vocoders created by VK5DGR, also the basis of FreeDV on HF<\/p>\n

condx \u00a0 \u00a0 \u00a0 \u00a0 condition(s)<\/p>\n

CoTY \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Club of the Year<\/p>\n

cps \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0characters per second<\/p>\n

cps \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0cycles per second (Hz)\u00a0(deprecated)<\/p>\n

CQWW \u00a0 \u00a0 \u00a0 \u00a0CQ worldwide (contest programme)<\/p>\n

CRC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0cyclic redundancy check<\/p>\n

CRT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0cathode ray tube<\/p>\n

CSC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Contest Support Committee<\/p>\n

CTCSS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 continuous tone coded squelch system<\/p>\n

CTS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 clear to send<\/p>\n

CV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 curriculum vitae<\/p>\n

c\/w \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0complete with<\/p>\n

CW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0continuous wave (usually meaning Morse code)<\/p>\n

DAC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 digital to analogue converter<\/p>\n

DARC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0[and] district amateur radio club<\/p>\n

DARC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Deutscher Amateur-Radio-Club<\/em> (German national society)<\/p>\n

DARS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0[and] district amateur radio society<\/p>\n

DATV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0digital amateur television<\/p>\n

dB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0decibel<\/p>\n

dBc\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0decibels relative to carrier<\/p>\n

dBd \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0decibels relative to a dipole<\/p>\n

dBFS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0decibels relative to full scale<\/p>\n

dBi \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 decibels relative to an isotropic radiator<\/p>\n

dBm \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 decibels relative to one milliwatt<\/p>\n

DBM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 double-balanced mixer<\/p>\n

dBW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 decibels relative to one watt<\/p>\n

DC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 direct current<\/p>\n

DCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Data Communications Committee<\/p>\n

DCS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 digital coded squelch<\/p>\n

DDS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 direct digital synthesiser<\/p>\n

DFIG\u00a0 \u00a0 \u00a0 \u00a0 \u00a0doubly fed induction generator<\/p>\n

DIN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Deutsches Institut f\u00fcr Normung<\/em> (German standards institute)<\/p>\n

DMA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 direct memory access<\/p>\n

DMR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Digital Mobile Radio<\/p>\n

DNR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 digital noise reduction<\/p>\n

DOCSIS \u00a0 \u00a0 \u00a0Data Over Cable Service Interface Specification<\/p>\n

DORA\u00a0 \u00a0 \u00a0 \u00a0 Directory Of Resources and Advice<\/p>\n

dPMR\u00a0 \u00a0 \u00a0 \u00a0 Digital Private Mobile Radio<\/p>\n

DSB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 double sideband<\/p>\n

DSC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 digital selective calling<\/p>\n

DSB-SC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 double sideband suppressed carrier<\/p>\n

DSL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0digital subscriber line<\/p>\n

DSP\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 digital signal processing (or processor)<\/p>\n

DSSC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 dual sideband suppressed carrier<\/p>\n

DSSS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 direct sequence spread spectrum<\/p>\n

D-Star \u00a0 \u00a0 \u00a0 \u00a0 Digital Smart Technologies for Amateur Radio<\/p>\n

DTL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0diode-transistor logic<\/p>\n

DTMF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 dual tone multi frequency (Touch-Tone)<\/p>\n

DUT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 device under test<\/p>\n

DV\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0digital voice<\/p>\n

DVB-S\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 digital video broadcasting \u2013 satellite<\/p>\n

DVB-S2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 digital video broadcasting \u2013 satellite, second generation<\/p>\n

DVB-T \u00a0 \u00a0 \u00a0 \u00a0 digital video broadcasting \u2013 terrestrial<\/p>\n

DVB-T2 \u00a0 \u00a0 \u00a0 digital video broadcasting \u2013 satellite, second generation<\/p>\n

DVSI\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Digital Voice Systems Inc, USA-based creators of IMBE and AMBE<\/p>\n

DX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0long distance<\/p>\n

DXCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0DX Century Club (award programme)<\/p>\n

DXpedition \u00a0 one or more amateurs going to an (usually infrequently activated) location to activate the square, country, island (or whatever) for a short time for the benefit of those wanting to work that place<\/p>\n

e \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0base of the natural logarithm (2.71828\u2026)<\/p>\n

ECSS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 exalted-carrier selectable-sideband (zero beat tuning to receive AM on SSB mode)<\/p>\n

EDR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Experimenterende Danske Radioamat\u00f8rer (Danish national society)<\/p>\n

EEPROM \u00a0 \u00a0 \u00a0 electrically erasable programmable read-only memory<\/p>\n

EG \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Examinations Group<\/p>\n

EIRP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 effective isotropic radiated power<\/p>\n

El \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0elevation<\/p>\n

ele \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [antenna] element(s)<\/p>\n

ELF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 extremely low frequency (300Hz to 3kHz)<\/p>\n

EMC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 electromagnetic compatibility<\/p>\n

EME\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 earth-moon-earth (Moonbounce)<\/p>\n

EMR\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 enhanced monitor request<\/p>\n

EHF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 extremely high frequency (30GHz to 300GHz)<\/p>\n

EMP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0electromagnetic pulse<\/p>\n

ENA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 enable<\/p>\n

ENR\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0excess noise ratio<\/p>\n

EPROM \u00a0 \u00a0 \u00a0 \u00a0erasable programmable read-only memory<\/p>\n

EQAM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Examination Quality Assurance Manager<\/p>\n

ERP\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 effective radiated power<\/p>\n

Es \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Sporadic-E (propagation)<\/p>\n

ESC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Examination Standards Committee<\/p>\n

ESM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Examinations Standards Manager<\/p>\n

ETCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Emerging Technology Co-ordination Committee<\/p>\n

EU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0European Union<\/p>\n

EUDXF\u00a0 \u00a0 \u00a0 \u00a0 European DX Foundation<\/p>\n

EUT\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0equipment under test<\/p>\n

EUV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0extreme ultraviolet<\/p>\n

EW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 electronic warfare<\/p>\n

EZNEC\u00ae\u00a0<\/sup>\u00a0 \u00a0 \u00a0NEC-based antenna modelling software<\/p>\n

F \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 farad<\/p>\n

F<\/em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0noise factor (note italic F)<\/p>\n

f \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0frequency (general)<\/p>\n

foF2 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 critical frequency (highest frequency returned by the F2 layer)<\/p>\n

FAQ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0frequently asked questions<\/p>\n

FCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Federal Communications Commission (USA regulator)<\/p>\n

FDD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0frequency division duplexing<\/p>\n

FDM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 frequency division multiplexing<\/p>\n

FDIM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Four Days In May<\/p>\n

FEC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0forward error correction<\/p>\n

FET \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0field-effect transistor<\/p>\n

FFT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Fast Fourier Transform<\/p>\n

FFTW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0fastest Fourier Transform in the West<\/p>\n

FH \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0frequency hopping<\/p>\n

FIR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 far infrared<\/p>\n

FM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 frequency modulation<\/p>\n

FMAC \u00a0 \u00a0 \u00a0 \u00a0 FM activity contest<\/p>\n

FOSS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0free open-source software<\/p>\n

FP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0floating point<\/p>\n

FPGA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0field programmable gate array<\/p>\n

fps \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 feet per second<\/p>\n

fps \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 frames per second<\/p>\n

FPV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0first person view (or video)<\/p>\n

FS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 full scale<\/p>\n

FS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 field strength<\/p>\n

FSD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 full scale deflection<\/p>\n

FSK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 frequency shift keying<\/p>\n

FSTV \u00a0 \u00a0 \u00a0 \u00a0 fast scan television<\/p>\n

ft \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0foot (about 305mm) (or feet)<\/p>\n

FTTP \u00a0 \u00a0 \u00a0 \u00a0 fibre to the premises<\/p>\n

FWHM \u00a0 \u00a0 \u00a0 \u00a0full width half maximum<\/p>\n

G \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 giga (multiplier, x 1,000,000,000)<\/p>\n

g \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 gram<\/p>\n

GAREC \u00a0 \u00a0 \u00a0 \u00a0Global Amateur Radio Emergency Communications Conference<\/p>\n

Gb \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 gigabit (conventionally 1,073,741,824 bits or 1024Mb)<\/p>\n

GB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 gigabyte (conventionally 1,073,741,824 bytes or 1024MB)<\/p>\n

GC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 good condition<\/p>\n

GE \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 General Electric (business)<\/p>\n

GEC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 General Electric Company<\/p>\n

GHz \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0gigahertz (thousand million cycles per second)<\/p>\n

GIRO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Global Ionospheric Research Organisation<\/p>\n

GLS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 general lighting service<\/p>\n

GM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0General Manager (RSGB)<\/p>\n

GM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0group mode<\/p>\n

GMDX \u00a0 \u00a0 \u00a0 \u00a0 Scottish DX Association<\/p>\n

GMRT\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Scottish Microwave Round Table<\/p>\n

GNSS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 global navigation satellite system<\/p>\n

GNU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0GNU’s Not Unix! [sic<\/em> – Ed]<\/p>\n

GP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ground plane<\/p>\n

GPIO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0general purpose input \/ output<\/p>\n

GPO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 General Post Office<\/p>\n

GPRS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0general packet radio service<\/p>\n

GPS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Global Positioning System<\/p>\n

GSM\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Global System for Mobile communications<\/p>\n

GWO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0good working order<\/p>\n

H \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0henry<\/p>\n

h \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0hour<\/p>\n

HAAT \u00a0 \u00a0 \u00a0 \u00a0 height above average terrain<\/p>\n

HAREC \u00a0 \u00a0 \u00a0 \u00a0Harmonised Amateur Radio Examination Certificate<\/p>\n

HD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 high definition<\/p>\n

HDTV \u00a0 \u00a0 \u00a0 \u00a0 high definition television<\/p>\n

HEVC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0high efficiency video coding<\/p>\n

HF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 high frequency (3MHz to 30MHz)<\/p>\n

HFC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 HF Convention (now RSGB Convention)<\/p>\n

HFC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 hybrid fibre coaxial<\/p>\n

HFCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0HF Contest Committee<\/p>\n

hFE<\/sub><\/em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0bipolar transistor DC current gain<\/a><\/p>\n

HPF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0high pass filter<\/p>\n

HPWPT \u00a0 \u00a0 \u00a0 high power wireless power transfer<\/p>\n

HS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 heatsink<\/p>\n

HVDC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0high voltage direct current<\/p>\n

Hz \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0hertz (cycles per second)<\/p>\n

I \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0current (A)<\/p>\n

I \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0in-phase component of a signal or magnitude<\/p>\n

I\/O \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 input \/ output<\/p>\n

I\/Q \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 in-phase and quadrature components of a signal<\/p>\n

IC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 integrated circuit<\/p>\n

ICAS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 intermittent commercial \/ amateur service<\/p>\n

Ic \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 collector current<\/p>\n

ICE\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 in-circuit emulation<\/p>\n

Id \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 drain current<\/p>\n

ID (or id) \u00a0 \u00a0 \u00a0inside diameter<\/p>\n

IDE \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 integrated development environment<\/p>\n

IDE \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 integrated drive electronics<\/p>\n

ISB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 independent sideband<\/p>\n

I2<\/sup>C \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 inter integrated circuit (digital communication)<\/p>\n

IARP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 International Amateur Radio Permit<\/p>\n

IARU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 International Amateur Radio Union<\/p>\n

ICNIRP \u00a0 \u00a0 \u00a0 \u00a0 International Commission on Non-Ionizing Radiation Protection<\/p>\n

IF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 intermediate frequency<\/p>\n

IGBT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 insulated-gate bipolar ransistor<\/p>\n

ILLW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 International Lighthouses and Lightships Week(end)<\/p>\n

IMBE\u00a0 \u00a0 \u00a0 \u00a0 Improved Multi-Band Excitation<\/p>\n

IMD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 intermodulation distortion<\/p>\n

in \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0inch (about 25.4mm)<\/p>\n

IOTA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Islands On The Air (awards programme and contest)<\/p>\n

IP3 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 third-order intercept<\/p>\n

IPO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 intercept point optimisation<\/p>\n

IR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 infrared<\/p>\n

IRC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 international reply coupon<\/p>\n

IRC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 internet relay chat<\/p>\n

IRLP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Internet Radio Linking Project<\/p>\n

IRQ\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 interrupt request<\/p>\n

ISB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 independent sideband<\/p>\n

ISBN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0international standard book number<\/p>\n

ISCAT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0ionospheric scattering<\/p>\n

ISM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Industrial, Scientific and Medical<\/p>\n

ISP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 internet service provider<\/p>\n

ISS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 International Space Station<\/p>\n

ITU \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 International Telecommunications Union<\/p>\n

ITS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Institute for Telecommunication Sciences (USA)<\/p>\n

J \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 joule<\/p>\n

JARL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Japan Amateur Radio League<\/p>\n

JFET\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 junction field effect transistor<\/p>\n

JOTA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Jamboree on the Air<\/p>\n

JPL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Jet Propulsion Laboratory (NASA)<\/p>\n

JTAG\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Joint Test Action Group<\/p>\n

JTDX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [K1]JT modes for DXing<\/p>\n

K \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0kelvin (NB: never \u00b0K)<\/p>\n

K \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0(Morse) invitation to transmit<\/p>\n

k \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 kilo (multiplier, x 1,000)<\/p>\n

kb \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 kilobit\u00a0 (conventionally 1024 bits)<\/p>\n

kB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 kilobyte (conventionally 1024 bytes)<\/p>\n

kc\/s\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 kilocycles per second (kilohertz) (deprecated)<\/p>\n

kg \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 kilogram (1000g)<\/p>\n

kHz \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 kilohertz (thousand cycles per second)<\/p>\n

km \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0kilometre<\/p>\n

ksps\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 kilosymbols per second<\/p>\n

kW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0kilowatt<\/p>\n

kWh \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0kilowatt-hour (3,600,000 joules)<\/p>\n

LAN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 local area network<\/p>\n

lb \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0pound<\/p>\n

LCD\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 liquid crystal display<\/p>\n

LDO\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0low dropout<\/p>\n

LDPC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 low density parity check<\/p>\n

LED\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 light-emitting diode<\/p>\n

LF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 low frequency (30kHz to 300kHz)<\/p>\n

LHS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0left hand side<\/p>\n

LISN\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 line impedance stabilisation network<\/p>\n

LiFePO4 \u00a0 \u00a0 \u00a0 \u00a0lithium iron phosphate (battery technology)<\/p>\n

Li-ion \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 lithium-ion (battery technology)<\/p>\n

LiPo \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0(also Li-Po)\u00a0lithium-polymer (battery technology)<\/p>\n

LNA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0low noise amplifier<\/p>\n

LNTA\u00a0 \u00a0 \u00a0 \u00a0\u00a0 low noise transconductance amplifier<\/p>\n

LO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0local oscillator<\/p>\n

LotW\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Logbook of the World<\/p>\n

LP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 log periodic<\/p>\n

LPF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 low pass filter<\/p>\n

LSB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 least significant bit<\/p>\n

LSB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 lower sideband<\/p>\n

LVD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Low Voltage Directive<\/p>\n

LVDS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 low voltage differential signalling<\/p>\n

LW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 long wave (about 150kHz to 300kHz)<\/p>\n

LWIR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 long wavelength infrared<\/p>\n

M \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 mega (multiplier, x 1,000,000)<\/p>\n

m \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 metre<\/p>\n

M17\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0an open source DV mode<\/p>\n

mA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 milliamp (0.001A, 1000\u00b5A)<\/p>\n

mAh \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 milliamp-hour (eg battery capacity)<\/p>\n

MARC \u00a0 \u00a0 \u00a0 \u00a0 Marconi Amateur Radio Circle (Malta)<\/p>\n

MARL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Malta Amateur Radio League<\/p>\n

Mb \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0megabit (conventionally 1048576 bits or 1024kb)<\/p>\n

MB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 megabyte (conventionally 1048576 bytes or 1024kB)<\/p>\n

MC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0master of ceremonies<\/p>\n

Mc\/s \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 megacycles per second (megahertz)\u00a0(deprecated)<\/p>\n

MER\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 modulation error rate<\/p>\n

MF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 medium frequency (300kHz to 3MHz)<\/p>\n

MFSK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 multiple frequency shift keying<\/p>\n

MGM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 machine-generated mode<\/p>\n

MHz \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0megahertz (million cycles per second)<\/p>\n

MIMO\u00a0 \u00a0 \u00a0 \u00a0 multiple input multiple output<\/p>\n

MLS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 maximum (or maximal) length sequence<\/p>\n

ML&S \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Martin Lynch & Sons (retailer)<\/p>\n

mm \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 millimetre (0.001m)<\/p>\n

MMDVM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Multi-Mode Digital Voice Modem<\/p>\n

MO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 multiple operator<\/p>\n

MoD\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Ministry of Defence<\/p>\n

MOSFET \u00a0 \u00a0 \u00a0metal oxide semiconductor field effect transistor<\/p>\n

MOTA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Museums on the Air<\/p>\n

MOTA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Mills on the Air<\/p>\n

MPEG \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Moving Picture Experts Group<\/p>\n

MR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 moonrise<\/p>\n

MS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 meteor scatter<\/p>\n

MS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 moonset<\/p>\n

MSF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0UK NPL standard time service broadcast on 60kHz<\/p>\n

MSHV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0meteor scatter [software by LZ2]HV<\/p>\n

MSK\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 minimum-shift keying<\/p>\n

Msps\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 megasymbols per second<\/p>\n

MSB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 most significant bit<\/p>\n

MTBF\u00a0 \u00a0 \u00a0 \u00a0 mean time before failure<\/p>\n

MUF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0maximum usable frequency<\/p>\n

mult \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0multiplier (contesting)<\/p>\n

MW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0medium wave (roughly 525-1600kHz)<\/p>\n

MW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0megawatt<\/p>\n

MWIR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0medium wavelength infrared<\/p>\n

n \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 nano (multiplier, x 0.000,000,001)<\/p>\n

NAND\u00a0 \u00a0 \u00a0 \u00a0 \u00a0not-AND (logic function)<\/p>\n

NASA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0National Aeronautics and Space Administration (USA)<\/p>\n

NB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 noise blanker<\/p>\n

NB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0nota bene<\/em> (note well, take note of)<\/p>\n

NDB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 non-directional beacon<\/p>\n

NEC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Numerical Electromagnetics Code<\/p>\n

NEC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 National Exhibition Centre<\/p>\n

NF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 noise figure<\/p>\n

NF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 noise floor<\/p>\n

NFD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0National Field Day<\/p>\n

NMEA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0National Marine Electronics Association (USA)<\/p>\n

NOAA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0National Oceanic and Atmospheric Administration (USA)<\/p>\n

NOR\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0not-OR (logic function)<\/p>\n

NiCd \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 nickel-cadmium (battery technology)<\/p>\n

NiFe \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 nickel-ion (battery technology)<\/p>\n

NiMH \u00a0 \u00a0 \u00a0 \u00a0 \u00a0nickle-metal hydride (battery technology)<\/p>\n

NIR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0near infrared<\/p>\n

nm \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 nanometre (1×10-9<\/sup>m)<\/p>\n

NMOS\u00a0 \u00a0 \u00a0 \u00a0 N-type metal-oxide-semiconductor<\/p>\n

NPL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0National Physical Laboratory (UK)<\/p>\n

NRC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0National Radio Centre<\/p>\n

NRRL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Norsk Radio Rel\u00e6 Liga<\/em><\/a> (Norwegian national society)<\/p>\n

NSD\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0noise spectral density<\/p>\n

NTP\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0network time protocol<\/p>\n

NTSC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 National Television Standards Committee (USA)<\/p>\n

NVIS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 near vertical incidence skywave<\/p>\n

NXDN\u00a0 \u00a0 \u00a0 \u00a0 \u00a0DV mode created by Icom and Kenwood<\/p>\n

Nyquist\u00a0 \u00a0 \u00a0 \u00a0 \u00a0(also Nyquist rate<\/a> or Nyquist Frequency<\/a>) refers to sampling rates; see links for details<\/p>\n

NZART \u00a0 \u00a0 \u00a0 \u00a0 New Zealand Association of Radio Transmitters<\/p>\n

OAS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 (RSGB) Operating Advisory Service<\/a><\/p>\n

OBO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0on behalf of<\/p>\n

OBO\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 or best offer<\/p>\n

OCXO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0oven controlled crystal oscillator<\/a><\/p>\n

OCFD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0off-centre fed dipole<\/a><\/p>\n

OD (or od) \u00a0 outside diameter<\/p>\n

ODX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 longest distance (best DX)<\/p>\n

OEM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 original equipment manufacture<\/a>r<\/p>\n

OIRO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0offer(s) in the region of<\/p>\n

OLED \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0organic light-emitting diode<\/a><\/p>\n

ONO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 or near offer<\/p>\n

OOK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 on-off keying<\/a><\/p>\n

OPEX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0operational expenditure<\/p>\n

OQPSK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0offset quadrature phase-shift keying<\/a><\/p>\n

OQRS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 online QSL request<\/a><\/p>\n

osc \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0oscillator<\/p>\n

OTA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 on the air<\/p>\n

OVNO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 or very near offer<\/p>\n

oz \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0ounce<\/a>, about 28.3g<\/p>\n

p \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pico (multiplier, x 0.000,000,000,001)<\/p>\n

P25 Phase 1\u00a0\u00a0 Project 25 Phase 1, an early DV mode used by public services in the USA<\/p>\n

P25 Phase 2\u00a0\u00a0 Project 25 phase 2, similar to Phase 1 in usage but is a TDMA system<\/p>\n

PA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 power amplifier<\/p>\n

PAE\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0power added efficiency<\/a><\/p>\n

PAL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0phase alternating line<\/a> (analogue TV colour encoding system)<\/p>\n

PATA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 parallel ATA<\/a>, an interface standard for disk drives<\/p>\n

PBT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0passband tuning<\/p>\n

PC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 personal computer<\/a><\/p>\n

PCM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pulse code modulation<\/a><\/p>\n

PD\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 potential difference<\/a><\/p>\n

PD\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 product detector<\/a> (frequency mixing demodulator for AM and SSB)<\/p>\n

PE\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 protective earth<\/a> (note that requirements vary between and even inside jurisdictions)<\/p>\n

pk \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 peak<\/p>\n

pk-pk \u00a0 \u00a0 \u00a0 \u00a0 \u00a0peak to peak<\/a><\/p>\n

PLC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0powerline communication<\/a> (eg domestic internet extenders that run signals through existing mains wiring)<\/p>\n

PLL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 phase-locked loop<\/a><\/p>\n

PM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 phase modulation<\/a><\/p>\n

PMG \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Postmaster General<\/a><\/p>\n

PMOS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0P-type metal-oxide-semiconductor<\/a><\/p>\n

PMR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 private (or professional) mobile radio<\/a><\/p>\n

PN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0phase noise<\/a><\/p>\n

POTS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 plain old telephone system (or service)<\/a><\/p>\n

PPR\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pulses per revolution<\/p>\n

PPR\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 prior permission required<\/p>\n

PPI\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 plan position indicator<\/a><\/p>\n

PPI\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pulse pause initiator<\/a><\/p>\n

PRNG \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pseudo-random noise<\/a> generator<\/p>\n

PROM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 programmable read-only memory<\/a><\/p>\n

pp \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0peak to peak<\/a><\/p>\n

p-p \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 peak to peak<\/a><\/p>\n

P&P \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 packing and\u00a0postage<\/p>\n

PPM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 pulse position modulation<\/a><\/p>\n

PSK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0phase shift keying<\/a><\/p>\n

PSTN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0public switched telephone network<\/a><\/p>\n

PTT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0push to talk<\/a><\/p>\n

PV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0photovoltaic<\/a><\/p>\n

PVC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 polyvinyl chloride<\/a><\/p>\n

PW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Practical Wireless<\/em><\/a><\/p>\n

PZK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Polski Zwiazek Kr\u00f3tkofalowc\u00f3w<\/em> (Polish national society)<\/p>\n

Q \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 quadrature component of a signal or magnitude<\/a><\/p>\n

Q \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 quality factor<\/a><\/p>\n

QAM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 quadrature amplitude modulation<\/a><\/p>\n

QP\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 quasi-peak<\/a> (detector for EMC measurements)<\/p>\n

QPSK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 quadrature phase shift keying<\/a><\/p>\n

QRA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 callsign<\/p>\n

QRA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Q-ary repeat-accumulate<\/p>\n

QRM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 interference from artificial sources<\/p>\n

QRN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 interference from natural sources<\/p>\n

QRO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 high power<\/p>\n

QRP\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 low power (usually <5W)<\/p>\n

QRPp\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 very low power (often well under 1W)<\/p>\n

QRS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 please send slower<\/p>\n

QRS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 slow Morse code<\/p>\n

QRSs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 extremely slow Morse code (seconds to hours per dit)<\/p>\n

QRT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0cease operating<\/p>\n

QRV\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (ready to) operate<\/p>\n

QRX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0wait<\/p>\n

QRZ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0who is calling me?<\/p>\n

QSB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fading<\/p>\n

QSK\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 listening (or interrupting) between transmissions<\/p>\n

QSL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 confirmation of contact<\/p>\n

QSO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 communication<\/p>\n

QST\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 general call to all stations (also,<\/p>\n

QST \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/em> ARRL<\/a> monthly magazine for members<\/p>\n

QSX\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 I am listening on [frequency]<\/p>\n

QSY \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 change frequency<\/p>\n

QTH\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 position (eg address)<\/p>\n

QTHR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u2018registered\u2019 position (eg, address as listed in callbook)<\/p>\n

Qu\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 unloaded quality factor<\/a><\/p>\n

QUCS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Quite Universal Circuit Simulator<\/em><\/p>\n

RA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Radiocommunications Agency (superseded by Ofcom in 2003)<\/p>\n

RAC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Radio Amateurs of Canada<\/a><\/p>\n

RadCom<\/em>\u00a0 \u00a0 \u00a0 \u00a0 RSGB monthly magazine<\/a> for Members<\/p>\n

RAF\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0RadioAmateurs France<\/a> (Soci\u00e9t\u00e9 nationale fran\u00e7aise<\/em>)<\/p>\n

RAF\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Royal Air Force<\/p>\n

RAFARS \u00a0 \u00a0 \u00a0 \u00a0 Royal Air Force Amateur Radio Society<\/a><\/p>\n

RAOTA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Radio Amateurs Old Timers’ Association<\/a><\/p>\n

R&TTE \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Radio Equipment and Telecommunications Terminal Equipment<\/p>\n

RAYNET \u00a0 \u00a0 \u00a0 \u00a0UK Radio Amateurs’ Emergency Network<\/a><\/p>\n

RBN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0reverse beacon network<\/p>\n

RBTV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0reduced bandwidth television<\/p>\n

RC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 radio club<\/p>\n

RC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 resistor-capacitor (network, time constant etc)<\/p>\n

RCF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Radio Communications Foundation<\/a><\/p>\n

RDRc \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Russian Digital Radioamateur Club<\/p>\n

RED \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Radio Equipment Directive<\/p>\n

REF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0R\u00e9seau des \u00c9metteurs Fran\u00e7ais<\/em><\/a> (French national society)<\/p>\n

REIN\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 repetitive electrical impulse noise<\/p>\n

REP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Rede dos Emissores Portugueses<\/em><\/a> (Portuguese national society)<\/p>\n

RF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 radio frequency<\/p>\n

RFI\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 radio frequency interference<\/p>\n

RHS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 right hand side<\/p>\n

RIT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0receiver incremental tuning<\/p>\n

RL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return loss<\/p>\n

RMDR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 reciprocal mixing dynamic range<\/p>\n

RMS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 root mean square<\/p>\n

RNAS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Royal Naval Air Station<\/p>\n

RNLI \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Royal National Lifeboat Institution<\/p>\n

ROA\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Radio Officers\u2019 Association<\/p>\n

RoLo\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Rolling Locators (contest)<\/p>\n

ROM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0read-only memory<\/p>\n

RP\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 reverse polarity (eg RP-SMA)<\/p>\n

RS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0readability, signal<\/p>\n

RS\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 register slect<\/p>\n

RSARS \u00a0 \u00a0 \u00a0 \u00a0 Royal Signals Amateur Radio Society<\/p>\n

RSGB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Radio Society of Great Britain<\/p>\n

RST \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0readability, signal, tone<\/p>\n

RTL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0resistor-transistor logic<\/p>\n

RTO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 regional telecommunication organisation<\/p>\n

RTS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 request to send<\/p>\n

RTTY \u00a0 \u00a0 \u00a0 \u00a0 \u00a0radio teletype<\/p>\n

RW\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0read \/ write<\/p>\n

R\/W\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 read \/ write<\/p>\n

Rx \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0receive (or receiver)<\/p>\n

s \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0second<\/p>\n

S \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0siemens (unit of conductance)<\/p>\n

S&P \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0search and pounce<\/p>\n

SAW\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 surface acoustic wave<\/p>\n

SCART\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Syndicat des Constructeurs d’Appareils Radior\u00e9cepteurs et T\u00e9l\u00e9viseurs<\/em> (French Radio and Television Receiver Manufacturers\u2019 Association)<\/p>\n

SCC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 special contest callsign<\/p>\n

SCL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 serial clock (I2<\/sup>C)<\/p>\n

SD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Secure Digital<\/p>\n

SD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 standard definition<\/p>\n

SDA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 serial data (I2<\/sup>C)<\/p>\n

SDR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 software defined radio<\/p>\n

SECAM \u00a0 \u00a0 \u00a0 \u00a0S\u00e9quentiel\u00a0couleur\u00a0\u00e0\u00a0m\u00e9moire<\/em><\/p>\n

SFDR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0spurious-free dynamic range<\/p>\n

SFI \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 solar flux index<\/p>\n

SHF \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0super high frequency (3GHz to 30GHz)<\/p>\n

SI\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0Syst\u00e8me international (d’unit\u00e9s) <\/i>(international system of units)<\/p>\n

sic \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0sic erat scriptum<\/i>, “thus was it written” (meaning “this is an exact <\/em>quotation, not a transcription error”)<\/p>\n

SISO\u00a0 \u00a0 \u00a0 \u00a0 \u00a0single input single output<\/p>\n

SK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0silent key (the person is dead)<\/p>\n

sked \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 scheduled contact (eg Alice calls Bob every Monday at 2pm on 145.450MHz)<\/p>\n

SLALIB \u00a0 \u00a0 \u00a0 \u00a0Subprogram Library\u00a0A<\/em><\/p>\n

SMA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sub miniature version A connector<\/p>\n

SMB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sub miniature version B connector<\/p>\n

SMC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sub miniature version C connector<\/p>\n

SMD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 surface mount device<\/p>\n

SMT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 surface mount technology<\/p>\n

S\/N \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0signal to noise (ratio)<\/p>\n

S\/N \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0serial number<\/p>\n

SNR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0signal to noise ratio<\/p>\n

SO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 single operator<\/p>\n

SO2R \u00a0 \u00a0 \u00a0 \u00a0 \u00a0single operator two radios<\/p>\n

SO2V \u00a0 \u00a0 \u00a0 \u00a0 \u00a0single operator two VFOs<\/p>\n

SOTA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Summits on the Air (awards programme)<\/p>\n

SPI \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 serial peripheral interface<\/p>\n

SR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0symbol rate<\/p>\n

SS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0spread spectrum<\/p>\n

SSB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0single sideband<\/p>\n

SSN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0smoothed sunspot number<\/p>\n

SSPA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0solid state power amplifier<\/p>\n

SSTV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0slow scan television<\/p>\n

STARS \u00a0 \u00a0 \u00a0 \u00a0Support to the Amateur Radio Service (IARU programme)<\/p>\n

STEM \u00a0 \u00a0 \u00a0 \u00a0 \u00a0science, technology, engineering and mathematics<\/p>\n

STL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 small transmitting loop<\/p>\n

SW \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 short wave (roughly 2-30MHz)<\/p>\n

SWL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0short wave listener<\/p>\n

SWR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0standing wave ratio<\/p>\n

T \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0tera (multiplier, x 1,000,000,000,000)<\/p>\n

T \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0turns (on an inductor)<\/p>\n

TCXO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0temperature compensated crystal oscillator<\/p>\n

TD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0time division<\/p>\n

TDD \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 time division duplexing<\/p>\n

TDM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 time division multiplexing<\/p>\n

TEC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Training and Education Committee<\/p>\n

TEC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0total electron content (propagation)<\/p>\n

TL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0transmission line<\/p>\n

TLA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 three-letter acronym (or abbreviation)<\/p>\n

TNC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0threaded Neill-Concelman (connector)<\/p>\n

TNC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0terminal node controller<\/p>\n

TOR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0teleprinter over radio<\/p>\n

TOR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0The Onion Router (internet anonymity network)<\/p>\n

TRF\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0tuned radio frequency<\/p>\n

tropo \u00a0 \u00a0 \u00a0 \u00a0 \u00a0tropospheric propagation<\/p>\n

TRRG\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Tenby Radio Repeater Group<\/p>\n

TS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0transport stream<\/p>\n

TTL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0transistor-transistor logic<\/p>\n

TV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0television<\/p>\n

TWG\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 technical working group<\/p>\n

Tx \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0transmit (or transmitter)<\/p>\n

\u00b5 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 micro (multiplier, x 0.000,001)<\/p>\n

\u00b5A \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 microamp (0.000,001A)<\/p>\n

UBA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Royal Union of Belgian Radio Amateurs<\/p>\n

UBN \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Unique, Busted or Not-in-the-log (contesting)<\/p>\n

UHF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ultra high frequency<\/a> (300MHz to 3GHz)<\/p>\n

UK \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 United Kingdom<\/a> of Great Britain and Northern Ireland<\/p>\n

UK&CD \u00a0 \u00a0 \u00a0 \u00a0 United Kingdom<\/a> [of Great Britain and Northern Ireland] and Crown Dependencies<\/a><\/p>\n

UKAC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 UK Activity Contest<\/p>\n

UKSMG \u00a0 \u00a0 \u00a0 \u00a0United Kingdom Six Metre Group<\/a><\/p>\n

UKuG \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 United Kingdom Microwave Group<\/a><\/p>\n

uPVC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0unplasticised polyvinyl chloride<\/a><\/p>\n

URE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Uni\u00f3n de Radioaficionados Espa\u00f1oles<\/em><\/a> (Spanish national society)<\/p>\n

URL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0uniform resource locator<\/a><\/p>\n

US \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0United States<\/a><\/p>\n

USA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0United States of America<\/a><\/p>\n

USB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Universal Serial Bus<\/a><\/p>\n

USB\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 upper sideband<\/a><\/p>\n

UTC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Temps Universel Coordonn\u00e9<\/em>\u00a0(Coordinated Universal Time<\/a>)<\/p>\n

V \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0volt<\/a> (unit for electric potential)<\/p>\n

VCO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 voltage controlled oscillator<\/a><\/p>\n

VCXO\u00a0 \u00a0 \u00a0 \u00a0 voltage controlled crystal oscillator<\/a><\/p>\n

VDSL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0very high bit-rate digital subscriber line<\/a><\/p>\n

VERON\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Vereniging voor Experimenteel Radio Onderzoek<\/a> Nederland (Dutch national society)<\/p>\n

VFO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 variable frequency oscillator<\/a><\/p>\n

VGC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0very good condition<\/p>\n

VHF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 very high frequency<\/a> (30MHz to 300MHz)<\/p>\n

VHFCC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0RSGB VHF Contest Committee<\/a><\/p>\n

VLF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 very low frequency<\/a> (3kHz to 30kHz)<\/p>\n

VLNA\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 very low noise amplifier<\/a><\/p>\n

VNA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0vector network analyser<\/a><\/p>\n

VOACAP \u00a0 \u00a0 \u00a0 Voice of America Coverage Analysis Program<\/a><\/em><\/p>\n

VoIP \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0voice over internet protocol<\/a><\/p>\n

VOX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0voice operated switch<\/a><\/p>\n

VPL\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 visual programming language<\/a><\/p>\n

Vs \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 supply voltage<\/p>\n

VSWR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0voltage standing wave ratio<\/a><\/p>\n

VXO \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0variable crystal oscillator<\/a><\/p>\n

W \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 watt<\/a> (SI<\/a> unit of power)<\/p>\n

WAB \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Worked All Britain<\/a> (awards programme)<\/p>\n

WAC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Worked All Continents<\/a> (award programme)<\/p>\n

WAS \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Worked All States<\/a> (awards programme)<\/p>\n

WARC \u00a0 \u00a0 \u00a0 \u00a0 \u00a0World Administrative Radio Congress<\/a> (or Conference)<\/p>\n

WAZ \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Worked All Zones<\/a> (award programme)<\/p>\n

WDM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 wavelength division multiplexing<\/a><\/p>\n

WHY \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 what have you? (what do you have [to offer])<\/p>\n

Wi-Fi\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 type of wireless networking<\/a><\/p>\n

WIA \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Wireless Institute of Australia<\/a><\/p>\n

WKD\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0(or wkd) worked<\/p>\n

WLAN\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 wireless local area network<\/a><\/p>\n

WPM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 words per minute<\/a><\/p>\n

WPS\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Wi-Fi Protected Setup<\/a><\/p>\n

WPT \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 wireless power transfer<\/a><\/p>\n

WRC\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 World Radiocommunication Conference<\/a><\/p>\n

WRPSA \u00a0 \u00a0 \u00a0 \u00a0World Radio Propagation Study Association<\/p>\n

W&S \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Waters and Stanton (retailer)<\/p>\n

WSPR\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Weak Signal Propagation Reporter<\/a><\/p>\n

WWV \u00a0 \u00a0 \u00a0 \u00a0 \u00a0US Government standard frequency and time station<\/a> on 2.5, 5, 10, 15, 20 and 25MHz<\/p>\n

WX \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0weather<\/a><\/p>\n

X \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 (electrical)\u00a0impedance<\/a>\u00a0(also, Z)<\/p>\n

xcvr \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 transceiver<\/a><\/p>\n

XFC\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0transmit frequency check<\/p>\n

XIT\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 transmit incremental tuning<\/p>\n

xmtr \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 transmitter<\/a><\/p>\n

XOR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0exclusive-OR<\/a> (logic)<\/p>\n

xtal \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0crystal<\/a><\/p>\n

XTLA\u00a0 \u00a0 \u00a0 \u00a0 eXtended\u00a0 three-letter acronym<\/a> (or abbreviation) (ie four letters)<\/p>\n

XYL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0ex YL (wife)<\/p>\n

yd \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0yard (3 feet, or about 0.914m)<\/p>\n

YL \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0young lady<\/p>\n

YMMV\u00a0 \u00a0 \u00a0 your mileage may vary (ie, the results you get may be different from the results given as an example)<\/p>\n

YOTA \u00a0 \u00a0 \u00a0 \u00a0 Youth on the Air<\/a><\/p>\n

Z\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0(electrical) impedance<\/a> (also, X)<\/p>\n

ZHR \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0zenithal hourly rate<\/a> (of meteors)<\/p>\n

Zo \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 characteristic impedance<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

GB2RS Local News and RadCom<\/em> Club Calendar conventions<\/strong><\/p>\n

Club net\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Members of a club having a turns-based conversation under a Net Controller<\/p>\n

Club night\u00a0\u00a0\u00a0\u00a0 General, un-themed meeting at normal club meeting-place<\/p>\n

On the air\u00a0\u00a0\u00a0\u00a0 Club members operating the club radio equipment, normally on club premises unless specified otherwise<\/p>\n

Open net\u00a0\u00a0\u00a0\u00a0\u00a0 Open to all turns-based conversation under a Net Controller<\/p>\n

Radio night\u00a0\u00a0 Club members operating the club radio equipment, normally on club premises<\/p>\n

 <\/p>\n

\"\"<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Final note<\/strong>: the ‘right’ way to express a figure and a unit puts a space between them, eg length of eight and a half metres should be written as 8.5 m. However, RadCom<\/em>\u00a0does not include a space, partly for typesetting reasons, so we would print it as 8.5m. We know <\/em>we’re wrong – but at least we are consistently <\/em>wrong.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

This is a non-exhaustive list of acronyms, abbreviations and conventions used in RadCom. At the bottom of the page you will also find some of the conventions used in GB2RS Local News and RadCom Club Calendar plus an explanation of common symbols used in RadCom and other RSGB publications.\u00a0Some of the definitions may vary slightly […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":11006,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-17406","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/pages\/17406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/comments?post=17406"}],"version-history":[{"count":0,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/pages\/17406\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/pages\/11006"}],"wp:attachment":[{"href":"https:\/\/rsgb.org\/main\/wp-json\/wp\/v2\/media?parent=17406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}