P25 portable homebrew repeater

[gmilhouse]

Hi everyone!

I want to build a UHF repeater that is transparent, just like the maxtrac ones. I don't really have access to GM300 or maxtrac radios here in Australia because they are pretty rare and expensive. I need 440Mhz with a 5Mhz split.

I have several UHF mobile radios available in the right split but I am not sure how to connect the whole thing up. This is what I thought might work but please correct me if I am wrong.

RX audio taken from discriminator and fed to TX radio after the pre - emphasis cct. Wire both radios to have a common gnd. Connect the TX PTT to gnd via a active low COR point in the RX radio.

Have I missed anything?

Thanks

Greg
VK2VGM

[MattSR]

Sounds good Greg. We did the same thing be rewiring a CDR700 to use the "Rx disc out" and "Flat Tx inputs"

Worked a charm after we got the levels right!