The desense is probably caused by broadband noise at the paging transmitter's third harmonic. A notch cavity on the output of the paging transmitter might be the lowest-loss, most cost-effective remedy.
Time to find out if you're a diplomat! 73, Paul, AE4KR ----- Original Message ----- From: Jed Barton To: Repeater-Builder@yahoogroups.com Sent: Monday, December 29, 2008 4:59 PM Subject: [Repeater-Builder] An intermod problem Hey guys, Alright, need some advice on this one. I have a uhf, and a little big from what we can tell has been in the receiver for a long time. The output of my machine is 449.225 with an input of 444.225. We're running a wacom wp678 duplexer, which is tuned up just fine. One problem, right next to my repeater is the evil paging transmitter outputting on 152.6. As soon as it keys up, with a weak signal on my receiver, it totally desenses it. I can have a signal that is dfq with no paging transmitter, but as soon as it keys up, it is weak. Any ideas for getting rid of this? The third harmonic of the paging transmitter is 457.8. Thoughts? Thanks, Jed
