Just put up my 160 antenna and have a new noise source to find. Very loud wide 
band buzzing that starts in the middle of the AM broadcast band and then 
abruptly drops to zero at 1870 KHZ. I have attached sound file and panadapter 
screen shots. It is not coming from my QTH. One night it went off at 11PM sharp 
but has returned and doesn't seem to quit. I will continue to monitor for a 
cycle. I walked the neighborhood with portable AM radio and the noise seems to 
be contained within a four house area. Tough to tell which house though. All 
utilities are buried in my neighborhood. Could this be a grow lamp ? Thanks 
-Joe N3HEE 
Topband Reflector Archives - http://www.contesting.com/_topband

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