I am the proud(?) new owner of what a believe to be a T1507
duplexer. I believe it is a bandpass only duplexer. I use, and am
familiar with, the T1504's which are Bp-Br duplexers. If the
duplexer in question is actually a T1507 it would seem to have
inferior receiver isolation of 55 dB vs 80 dB in the T1504.
Whether this is actually difference that is significant, is a
question I've been puzzling over for a bit. Is 55 dB of isolation
enough for most repeaters? I also noticed a difference of 1.3 vs.
2.0 dB insertion loss between the two, but I suspect I can
compensate for this with a better antenna.
I note that some folks have been using these bandpass only duplexers
in their repeaters with some success, so there is no doubt on my
part that it can be used with a repeater. I would like to get some
input from the folks on the list as to the benefits (or disbenefits)
of this type of duplexer compared to a Bp-Br duplexer such as the
T1504. Also, is one better off with a T1504 or a T1507 at a location
where there is another 450 mhz repeater?
Thanks very much in advance!
Mark
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