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: [email protected] 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
