Yes. The likely cause is failure to implement proper chassis-to-chassis
bonding between all station equipment, including the computer and
computer audio interface. It is also important that all station
equipment get power from the same outlet or outlet box, or, if from
different outlets, the frames (green wire) must be bonded together.
There's considerable detail on this in the slide show for a talk I've
done at the Visalia DX Convention, at Pacificon, and to several ham
clubs. Nearly all of it is included in N0AX's recent ARRL book on
Bonding and Grounding. http://k9yc.com/GroundingAndAudio.pdf
73, Jim K9YC
On 1/21/2019 5:50 AM, Bill Somerville wrote:
the multiple spots for a time period are probably due to a poor signal
from the transmitting station, line noise in their audio interface to
the transmitter is the most likely cause. The clue is the 120 Hz and
multiples spacings (odd harmonics of their line frequency being the
major noise component of full-wave rectification and inadequate
filtering or poor earth returns), certainty would come from a similar
pattern spotted by a station in a 50 Hz line frequency region like most
of the EU.
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