On 12/17/2019 11:07 AM, K9MA wrote:
In my case, the noise is present any time the KPA1500 is turn on. Its
effect depends only on the direction my beam is pointed, as both my
noise level and the amplifier noise vary with direction. In the worst
case, I'm seeing about a 5 dB increase from my high urban noise floor. I
think the effect would be far more dramatic in a quiet location. (My
antenna is about 100 feet from the amplifier, which is in the basement.)
Scott,
Your result suggests a problem with bonding in your station. Study this
tutorial, http://k9yc.com/GroundingAndAudio.pdf and/or N0AX's recent
ARRL book on the topic, to which I contributed extensively.
73, Jim K9YC
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