We have about 19 Spectra-Tac receivers online in our network, here are a few "normal" problems that you should check. 1) The power supply eats the 100uf caps like crazy, especially after 25+ years of use, we change them both as routine maintenance. 2) Likewise, on the audio board the same thing, electrolytics drop in value, not unusual for a 100uf to read 2uf... 3)On the receiver boards themselves, the small shield covers over the discriminator and high IF areas loose their grounds as the tiny pins that hold them down get oxidized. We clean them and solder the corners to the board, this fixes a multitude of problems, including squelch that won't close, and popping of the squelch. 4) if you use the 2175 encoder cards in your application, the " test" switches become open , especially the HIGH test, we replace them with a small toggle switch, this fixes lots of intermittent problems as well. 5) Be sure that your guard tome level is set to -13dbm, any lower and the receiver will false Hope this helps. lance N2HBA ----- Original Message ----- From: kc8lts To: [email protected] Sent: Monday, May 07, 2007 1:21 PM Subject: [Repeater-Builder] Spectra Tac (Micor) receiver problem?
Has anyone encountered this problem with the Spectra Tac receivers? I have a number of receivers that are having an issue of the squelch being opened up by something in the circuitry ramping up a voltage. Or at least that is what I believe. The problem is that the receiver only has the PL holding it closed, no squelch control. Then when the PL gets falsed I get a lot of static noise floor across the repeater till the PL finally calms down and shuts the receiver off. If I go to the receive site the squelch pot on the receiver does nothing. If I take the board out and exchange it for another squelch board the squelch then works again for about a 24 hours to a week. I can then go back to the site and put the same old board I pulled out a couple days before back in and that one will again work for 24 hours to a week again. So the board must discharge the voltage after I pull it out of the receiver for a while. So I'm asking if anyone has run across this before and already has a solution to this issue. No matter what squelch board I put in the problem is the same. Any prior insite or experience would be greatly appreciated. Thanks, T.J.
