Could also be a ground loop in the audio chain somewhere...start lifting shields one at a time in the repeat audio chain and see if it goes away.
On 4/26/2010 10:36 AM, Eric Lemmon wrote: > Wade, > > This sounds like a defective insulator or cable clamp sparking on a power > pole. Such interference can carry for many miles. Try using a portable > radio with a handheld Yagi antenna to pinpoint the source. The power > company must repair this defect. > > 73, Eric Lemmon WB6FLY > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of kc0mlt > Sent: Monday, April 26, 2010 7:24 AM > To: [email protected] > Subject: [Repeater-Builder] AC buzz on VHF > > > > Hello all, > > I am in the process of putting up a 2m repeater on what I would consider a > pretty vacant site. There is only one other machine (70cm repeater) > currently out there. My concern is with an AC (60Hz) buzz that comes across > on the VHF band. It doesn't have a signal to it that will key uip a radio, > but when you receive an actual signal you can hear it. We have heard this on > both handhelds and mobiles. This site is unique as it is a dual tower with > old (unused) microwave panels and drums on the bridge at the top of the two > towers. The microwave equipment is no longer hooked up. We have had the > power company totally unhook the power to the site and the buzz was still > present. The nearest high voltage lines are about 1.5 to 2 miles away. You > can not hear the buzz on any AM receiver. Does anybody have a clue as to > what this could be and what we could to do prevent it? We have some thoughts > on the grounding of the guy wire being a cause but we are unsure of that. > Any ideas would be greatly appreciated! > > Thanks > Wade > KC0MLT
