On Mon, Jan 24, 2011 at 08:20:35AM -0600, K4RO Kirk Pickering wrote: > I have been plagued recently by a noise source which is > wiping out signals on the 160m and 80m bands. It is 20dB > louder on my SW Beverage than any other direction. > > The noise is intermittent, and comes on for roughly 10-15 > minute intervals, and when it goes off, it is completely > quiet for another roughly 10 minutes. The amplitude peaks > are at approximately 20-30 kHz intervals, an seem to vary > somewhat with frequency. I can hear the noise from about > 1600 to 4200 khz. It's really hurting my 80 and 160 meter > reception. Here is what the noise sounded like this morning: > > http://www.k4ro.net/k4ro/audio/QRN_Jan24_2011.wav > > Before I start hunting, I wonder if anyone has heard this > type of noise before, and might be able to identify it? > Thanks for any suggestions.
>From your description, I strongly suspect it is a high efficiency furnace -- most likely caused by either the inducer motor or a DC blower motor. I've heard of numerous complaints about this recently, some even on this list, and have a friend who is being plagued by his own new furnace, which is essentially wiping out his HF capabilities. Do you have a neighbor who perchance has installed a new furnace recently, perhaps just before the new year in order to take advantage of the expiring tax credit? Rob / KD8WK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
