Yep, sounds like high voltage noise from a dirty insulator, more noticeable in foggy conditions. Dirt attracts moisture and at 12,000 Volts (or whatever the potential is) you get small shorts that crackle, like in the back of a dirty TV set.
If you track it down to a Power Company's insulator, give them a call. I was working at a saw mill one night when the substation there went down from saw dust accumulation on the insulators. 73, KD6AAJ --- On Wed, 1/28/09, Joe <k1ike_m...@snet.net> wrote: > From: Joe <k1ike_m...@snet.net> > Subject: Re: [Repeater-Builder] 2 meter noise help! > To: Repeater-Builder@yahoogroups.com > Date: Wednesday, January 28, 2009, 6:45 AM > Have you taken a yagi on the roof and tried to determine the > direction > of the noise? I find that using the AM mode (on my > handheld scanner or > HT) is easier to pinpoint some forms of noise. You > didn't say that you > eliminated the antenna. Using the yagi on the roof should > give you an > idea of where (or where not) the noise is coming from. > > I've been off packet radio for years, but one of the > experiments I > always wanted to do is try and audio DSP unit to eliminate > some forms of > noise. Many people don't realize it, but you have > discovered how > destructive noise can be to a packet AFSK signal. I had a > bad power > line insulator/tie wire combination outside my house that > completely > decimated my Netrom node digipeater. The signal sounded > good to the > human ear, but the TNC just couldn't decode anything > but a full quieting > signal. > > 73, Joe, K1ike > > Christopher K. Greenhalgh wrote: > > While not a true repeater, I hoping the gurus here can > help me. > > > > Station info can be seen here; > http://www.n8wct.com/n8wct-4/ > > > > The noise is a subtle low-frequency "bacon > crackling". It is apparent > > across the whole 2 meter band. Every piece of (my) > equipment has been > > replaced, or substituted. We even bypassed the filter, > turned > > everything off, and the noise was still present, even > on battery > > power. SWR is fine...the station can be heard 90 miles > away. > > > ------------------------------------ > > > > Yahoo! Groups Links > > >
