Hi all, I've been working on this problem for a while and have not come up with any good solutions. So I'm hoping to find someone that has "been there, done that" with some suggestions.
The issue is that I want to add a same-band remote base to an existing repeater. The main problem is that the remote base is a transceiver and I can't find a way to provide proper isolation to/from the repeater. Here are the frequencies, but it looks like it really doesn't matter all that much. The repeater transmits on 443.300, receives on 443.800. We're using a typical UHF pass-reject duplexer with about 70 db of isolation between those two freqs. The remote base will transmit on 444.225 and receive on 449.225. I can put two antennas on the tower, but my horizontal space will be less than 20 feet. >From the pile of spare parts, I have a multitude of UHF band pass and notch filters. I would also not be opposed to adding something like a pass-notch duplexer if there is a way to configure it to work. >From my testing, it seems that the real issue is that the remote base is a transceiver and there is pretty much no way to add anything except notch filtering. Adding band pass cans will filter either the tx or the rx, but not in any combination (that I can find) to do both. If the remote base had a separate tx and rx, then a band pass can with a notch can (on the repeater freqs) on each side would probably work fine. Anyone have a good solution? Dwayne Kincaid WD8OYG
