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A GUIDE TO ATV
70CMs
1.3GHz
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10GHz ATV
ATV is permitted on all the microwave bands, i.e.: 23 cm and upwards. The only band where there is some appreciable activity is 10GHz. This band is just below the satellite TV bands, and the techniques used to transmit and receive signals are very different to those used on 23 cm. The propagation characteristics at these frequencies mean that signals will not travel much over the visual horizon. This means that many people have to use portable operation from a local hilltop. However, several repeaters are now active on this band including (GB3XG in Bristol), and many see the 10GHz band as being a major carrier of Amateur Television traffic in the future.

Gunn Diode module


There is no commercially available equipment on the market at all, but Bob Platts G8OZP does market several kit products to assist the enthusiastic amateur / Home constructor get going.

It is also possible to modify some types of LNB (Low Noise Block Down converters) not only to provide a receive set-up but also to transmit television pictures.

Once you start to get into the microwave bands you move slowly away from the traditional coaxial cable to carry all your precious RF to the aerial system. These modes use Waveguide to carry all the RF energy. Waveguide is generally of a squared section and is given a number, some of the common numbers used in Amateur circles are WG16, and for older LNB's WG17.

WG16 Waveguide Flange

Waveguide to waveguide connections can be either of the circular type that just twist together, or of a bolted nature. The bolt together type (as shown above) have four holes that small bolts may pass through. Much home built equipment will have numerous inter-connections, these are often "SMA" to "SMA" using semi rigid coaxial cable.




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