[Elecraft] External speaker hum with K3

[Bill Frantz]

This probably isn't the problem being experienced, but I found 
when I took the audio output of the ICOM 706 in my car and ran 
it through the car stereo system there was a strong low 
frequency "hum" when listening to a local 2M repeater. After a 
bit of thought, I am blaming the 151.4 Hz CTCSS tone sent by the 
repeater, which is too low for the small speaker in the radio, 
but comes out strongly with the car stereo. I haven't had a 
chance to install a high pass filter in the audio line.

Cheers - Bill, AE6JV/OK

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Bill Frantz        | Since the IBM Selectric, keyboards have gotten
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