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AM broadcast on 80 meters?

Oct 12th, 09:18


Joined: Apr 7th 2012, 19:22
Total Topics: 0
Total Posts: 0
On a 80 meter frequency used by one of our ARES net, I am hearing an AM signal that sounds like a broadcast station. Can interference from AM MW reach that high, and would a high-pass filter with cut-off of 1700 Hz help? Thanks.
Oct 12th, 14:44


Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
Yes sometimes the filter can help. But, Rigs like the K3 with ham band bandpass filters are much less likely to have difficulty with a clean transmitter than receivers that use the same filters for ham band and general coverage reception.

Perhaps the first thing to do is to take out any preamplifiers and put in some front end attenuation to see if that helps--it could just be a preamp or front end mixer overloading.

One clue is to whether everyone is hearing the interference--it is possible, though rare, to have a misadjusted broadcast transmitter.

Zack Lau W1VT
ARRL Senior Lab Engieer

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