On 2/24/2020 11:25 AM, Matt NQ6N wrote:
I'd also welcome ideas for things to test/try that might shed some light on
what is going on.
Hi Matt,
Several suggestions. Ideally, this is a quest that requires help from
another ham. One of you transmits while the other pokes around with that
portable RX. Without that help, a good first move is to listen for the
mix product(s) on a second radio while a directional antenna is rotated
while transmitting, noting the direction(s) where the IM product(s)
peak. With that information, transmit keydown and poke around with your
portable RX.
As to the harmonics -- they are generated by the rectification. Even the
most heroic stubs or bandpass filters in you station have zero affect on
the IM process.
A great first move is to first search out and destroy (replace) ALL
outboard SMPS that you can find, and put serious ferrite chokes on the
AC cord of any built into equipment (appliances, home entertainment
systems, anything plugs into the wall and has any form of electronic
control). Search out and replace anything with variable-speed control of
a motor (HVAC systems, etc.)
73, Jim K9YC
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