Have you taken the duplexer out of the equation, put a dummy load on the
TX port, a tuned antenna on the receive port and see if the receiver is
receiving properly? If you have a service monitor, check to see if it
is within performance specs for 12db sinad and 20 db quieting. If it
is, then it's a duplexer problem. If not, then it's a receiver problem
and not a duplexer. Got to first isolate where the trouble is. That
would be a very deaf receiver that's either tuned off frequency, shorted
coax, busted connectors or other problems. If it's a duplexer, it's
tuned wrong and / or highly desensed. Let us know how you make out
finding out which component is the culprit.
Albert
n9wys wrote:
A friend of mine has a Motorola R1225 repeater that is as deaf as a
fence post.
We've tried re-tuning the original duplexer and replacing it with
another known-good duplexer. We even tried separating the antennas,
although we could only get about 30' of vertical separation between
the two. Nothing seems to work - and at 150mW on an HT, I can only
get about 30' away from the repeater antenna before I cannot access
it. 4W will give me a range of about 100 yds.
Does anyone have the manual for this machine? If so, I'd be much
obliged for a copy of any receiver tune-up procedures. I hate to
think this thing is junk...
Thanks in advance,
Mark - N9WYS
