Some of the line-conducted emissions can radiate from the power distribution circuits - especially with overhead service
Charlie, K4OTV -----Original Message----- From: Topband [mailto:[email protected]] On Behalf Of N1BUG Sent: Saturday, November 09, 2013 6:29 PM To: Rick ve3mm Cc: [email protected] Subject: Re: Topband: Local noise source identification I realize this won't help but I have a similar noise. Mine is about 24 kHz wide and drifts up/down considerably more than yours. The drift seems related to outside temperature. Here's the real kicker: it goes away every year immediately upon the coming of snow cover, but does not return until mid-summer sometime. This has been happening for at least five years now. I've tracked it to a group of 4 or 5 houses on the other side of a river, about 1000 feet from (some of) my Beverages. Sidebar: With a portable receiver I can also detect it re-radiating from my 100 foot vertical, which is 1500 feet from the source. Good luck, and let us know if you find it. 73, Paul N1BUG On 11/09/2013 05:15 PM, Rick ve3mm wrote: > I am looking for suggestions to help identify a local noise that I am > experiencing on topband. > > It's characteristics are; > - bandwidth approximately 15 kHz > - amplitude relatively constant > - centre frequency seems to vary in small steps over time, no real pattern. > - right now the centre frequency is 1819 kHz, it moves up and down up to 7 > or 8 kHz. > - does not seem to be present during the day. At least not this afternoon. > > I shut down all of the circuits in my house other than my shack and it did > not disappear. > > Has anyone experienced something similar? > > 73 > > Rick ve3mm _________________ Topband Reflector _________________ Topband Reflector
