Bob, K8IA wrote:
"...Until I recently erected a pair of K9AY loops, the noise was not even
evident on my normal 160m antennas, a Inv V and an In L."
==========
The noise from a well-filtered switching power supply is usually not
noticed unless the antenna is close to the noise source, such as a random
wire fed by an antenna tuner located in the ham shack or by signal pickup
due to common mode coupling on coax feedlines.
I know that the best way to cure a problem is to nip it in the bud at the
source, however Bob's statement suggests that the switching power supply
noise is being picked up by the coax feeding the K9AY loops. Try using a
choke balun at the antenna end of the K9AY antenna feedline to see if
this minimizes the noise to your satisfaction, Bob.
73, de Earl
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