On 2/24/2020 1:03 PM, Matt NQ6N wrote:
Thanks much for the tips, Jim. Do you know if the wall warts can cause
mixing when they are not plugged into the wall or if the circuit breaker
is turned off?
They can cause mixing if connected to wires that can function as RX and
TX antennas. And when operating, they produce noise which gets radiated
and received by your antennas. SMPS are noise generators, which the
major reason for a search out and destroy mission.
In my testing the other day I did not see any difference in the 14.786
MHz mixing product when turning off all of the breakers in the breaker
box. Does that test eliminate any warts on those circuits as culprits
for the specific mixing that remains present at 14.786?
No, power is not required for them to cause mixing -- it's passive
device in that regard.
My next test will be to power down the entire house and transmit with
the KX2 on battery, connected directly to the antenna, and confirm that
the mixing product is still there (eliminating anything in the shack
itself).
As noted above, that is NOT a meaningful test.
73, Jim K9YC
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