Technical topics for ATV repeater builders

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.

Logic

The BATC Repeater Controller was initially designed for use by GB3HV, but can be adapted for use in any repeater system where digital end to end video and audio switching controlled by a Raspberry Pi is required. See Repeater Controller

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

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

Filters

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