Well let us know how it turns out. Hopefully you didn't make the easy
mistake of having the coaxes off of the RX and the TX connected to the
incorrect ports on the duplexer??? OR maybe the fellow whom tuned the
duplexer transposed the high and low sides??? easily enough done and a
very easy mistake to make!
Albert
n9wys wrote:
I just brought the repeater back to my shack this afternoon... the
"service monitor test" will be one of the first performed.
Although I did not tune the duplexers personally, I trust the guy who
did tune them - and he did two of them for us. So if it is a bad
duplexer, it's actually TWO of them.
Thanks for the tips - and now I'm of to the shack and a service
monitor. ;-)
73 de Mark - N9WYS
------------------------------------------------------------------------
From: Repeater-Builder@yahoogroups.com On Behalf Of Albert
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
