Ok a little update on the AC buzz. After some preliminary investigation we located two very noisy transformers on poles with in 1 1/2 miles of the site. The site was disconnected and a clamp on one of the wire was replaced and the wire attachments on our road side supply pole were check and ok'ed by the power company. We will be doing a little more searching with the HT in a tube method to hopefully get this taken care of. One interesting note, with an HT on an Air band frequency when held near the ground / power pole guy wires there is one heck of a buzz there! Even on some of the tower guy wires we get the harsh buzz, but not all...?
In the mean time, is there any way we can eliminate / filter out the buzz? My thought was maybe coiling up the antenna to Hardline jumper out at the antenna end. Our jumper is will be made out of 9913 for now. Any other suggestions as to a filter? Thanks for all the input so far! Wade KC0MLT --- In Repeater-Builder@yahoogroups.com, Joe <k1ike_m...@...> wrote: > > I had a similar problem at my house and it was tearing up my packet > digipeater. It turned out to be microspark interference. See this message: > > http://www.mail-archive.com/repeater-builder@yahoogroups.com/msg50828.html > > It turned out to be a tie-wire that is used to hold the wire into the > insulator on the high voltage line in front of my house. The tie wire > was just long enough to resonate in the 2 meter VHF band, but very > little noise was being created on the AM broadcast band. Do the test > that I described in the above message and see if it is AC power line > interference. If it is, you should ride around the general area of the > tower and listen on your car AM radio. When you get very close to it, > you should hear the interference on both the VHF and Am radio. If you > have a handheld scanner that receives AM it will be easier to find the > interference. > > 73, Joe, K1ike > > > > On 4/26/2010 10:23 AM, kc0mlt wrote: > > 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 actuall signal you can here it. We > > have heard this on both handhelds and mobiles. This site is unique as it is > > a duel 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 reciever. 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 > > > > > > > > ------------------------------------ > > > > > > > > Yahoo! Groups Links > > > > > > > > > > >
