RadCom Plus, Vol. 2, No. 1

| February 5, 2016

Cover image: Controller for the magnetic loop.

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4 DATV video link Construction, testing and characterisation
Mark Atherton, ZL3JVX has been working on a 1.3GHz digital video shack-to-repeater link using a custom DVB-S modulator and an off-the-shelf satellite receiver. This article documents some of the equipment that was constructed along the way.

16 Algorithms and techniques for detecting signals in noise
Monitoring of beacons that are normally undetectable but can suddenly come up out of the noise can be a time consuming and boring task says Andy Talbot, G4JNT. It would be a lot easier if we could automatically detect the presence of a weak carrier in noise and either sound an alarm or start some recording software.

18 Magnetic loop antenna
Tim Forrester, G4WIM designed a fast auto tuning magnetic loop with adjustable input coupling for the bands between 80 and 20m. The aim was to have a VSWR of less than 1.5 and to achieve this in less than one second.

34 How oscillators work
The oscillator is a vital component of all RF communication systems and its performance is very important in modern systems where we are trying to make best use of the spectrum, and send data at as high a rate as possible in a given bandwidth. Paul Brooking, G4SHH takes a look at the underlying maths.

Category: RadCom Plus