Bob Dengler wrote: > At 2/23/2007 12:50 PM, you wrote: >> With respect to using the GE MII mobile frame for repeater applications: >> >>> 1. Can you say categorically that there is sufficient TX/RX shielding >> to prevent any desense at any power level the conversion is capable of >> operating? >> >> In my experience, yes. In fact, we have had several repeaters that the >> sensitivity actually gets BETTER with the transmitter active. (due to the >> correct 50 impedance being applied to the TX port of the duplexer) > > Hmmm, that sounds rather unusual. I can see the non-50 ohm impedance at > the TX port pulling the notches on the RX side, but I wouldn't expect it > to affect the much broader RX pass response to the point of degraded RX > sensitivity.
I'm assuming he had the antenna relay in line, and it was still switching when keyed/unkeyed. I would either hardwire the relay in tx mode, or jumper it out. -- Jim Barbour WD8CHL
