At 5/11/2008 14:33, you wrote: >I would like to add a control receiver to a UHF (446 MHz) repeater. The >repeater is at a hospital that has allowed us to put up the repeater >antenna but is very hesitant to permit additional antennas. So, is there a >way that I can use the repeater antenna for both the repeater and the >control receiver? > >John AF4PD
Sure, if your input & control RX freqs. are close enough. I have 2 sites where the input & link RXs are only ~600 kHz apart. Since I have plenty of link margin, I put a 10 dB coupler on the output of the RX preamp (fed by the RX port of the duplexer through a pass cavity) & feed the coupled port to the link RX. The off-channel loss of the pass cavity & pass response of the duplexer results in a few more dB of loss, but since my link paths are line-of-sight I don't notice the loss. Bob NO6B
