Technical topics for ATV repeater builders

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This is a collection of articles designed specifically with the ATV repeater builder in mind.

Receivers

File:SL30 lock detect.pdf - How to obtain a lock indication from the Comag SL30 receiver.

Transmitters

Logic

Antennas

Repeater aerials are difficult as they need to be horizontal omni!

70cms

G8GTZ built the VHF comms Big wheel or clover leaf design made out of 8mm copper brake pipe for GB3HV

VHF Comms 2-94 article.jpg

VHF Comms 2-94.jpg

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Other designs available are:

https://do7psl.de/portfolio-item/big-wheel-vhf-and-uhf/

https://vk6ysf.com/435mhz_5_petal_cloverleaf_antenna.htm

And you can buy one, which is what the ZZ team did

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Filters

ID Elektronik GMBH make some amazing filters and duplexers for 23cms and above - you can't build them for the price.