I used to find several things creating noise problems. One is a noise on 145.250 Mhz, caused by leakage from cable systems. I could drive or walk around Hughson california and find so many spots where it leaked from poor connections, and so on. Another was the computers in use in many stores. I particularly recall an auto parts store that had noise on one of the local repeater outputs. There are a lot of cheap computers with a number of things adding to the noise problems. Cheap power supplies and poor shielding are two of them. Oddly enough, I myself was running an all Intel computer, and got virtually no noise from it even with the side cover off. this was Intel case, power supply, motherboard and CPU. I can't say if any of the above souces would cause noise problems on six, but some created havoc on HF. I also just recalled, we had a wireless doorbell that picked up SSB on 20 meters when I transmitted. Not on any other HF band, go figure. Back in the 70's, I tracked an HF noise source as being an older color TV that had a problem with the horizonatl output circuit (tube type).
So, there are so many possible noise souces to consider... Wayne WA2YNE On Fri, 26 Dec 2008 12:36:28 -0600, James Adkins <[email protected]> wrote: > Our 6-meter machine in Springfield, MO had an issue with a "noise" on > the RX > side. RX on 51.570 with TX RX duplexers and a dual cavity TX RX 11-18-06 > bandpass filter on the front end, and we were getting a "gurgling" type > noise. If we didn't run a PL, the squelch would hang open until the > repeater shut down. The problem only seemed to occur after about 4 p.m. > and > usually went away around 9 or 10 at night. > > We were determined not to install the repeater at the final site until we > could make sure that there was not a problem with the repeater. After a > couple weeks of checking and double checking and and looking for > interference, we finally found it . . . . > > It was an Apex 24" TV! Shutting it off resovled the problem. > > You just never know when it's 6-meters! Lots of noise out there, but, > that's part of the fun, too, is the extra challenges of putting up a > 6-meter > machine. > Balance snipped... -- Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) <*> To change settings via email: mailto:[email protected] mailto:[email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
