I have far less experience with this sort of thing than most anyone here but IMHO towers that are guyed SHOULD have insulators breaking up the guy wires, as close to the tower as possible, and at least one per guy wire. The guy wires that were installed on the tower where my repeater is installed MOVE ever so slightly on windy days. When the wires move you get static from the metal on metal surfaces. We broke the wires with JUST ONE insulator per leg and the noise we were getting on windy days disappeared. -MIke
From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of hankjr...@aol.com Sent: Thursday, March 12, 2009 4:59 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Quieting duplex noise from a tower Sorry, I have the same problem with my repeater on a 100 foot tower guyed with 3/16 cable. It seems when the temp drops below 60 F I get a squeal in the RX side of my repeater. I can shake the tower when its doing it and it will go away for a few minutes. We went up and grounded the antenna and bracket to the tower. I thought we were getting RX noise from a bad connection that would get worse when the temp dropped due to the metal shrinking. Still no luck fixing it. I'm not sure what to do now. 73, KD5UZA In a message dated 3/12/2009 3:39:30 P.M. Central Daylight Time, paul_n1...@myfairpoint.net writes: Hi Randy, I remember working you on 2 meters. That is very interesting. I tried bonding all the joints. If anything it actually seemed to make things worse!? I have been seriously thinking about Phillystran. It's a big expense not knowing for sure where the problem lies, but the only way to find out may be to try it and see! Paul wb8art wrote: > Hello Paul, Worked you a few times many moons ago. I would > agree with Jeff with tapping and slightly causing movement with > the repeater up with a weak signal. I have before experiened both > an antenna (stationmaster) with internal broken joint which > caused severe noise and desense but also dependent on movement in > the structure. Also have seen with a 100ft. guyed 3/36 town like > yours having the same issue. I tried grounding bonding all > joints on guys to tower and between tower sections to no avail. > Also tried isolating the preforms from tower and bottom supports > with no change. I decided that the 3/16 stranded was the > generation source. We changed the guys to Phillystran and never > had another issue. _____ Need a job? Find <http://yellowpages.aol.com/search?query=employment_agencies&ncid=emlcntusye lp00000005> employment help in your area. __________ NOD32 3931 (20090312) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com
