On Sat,3/14/2015 3:19 PM, Kenneth G. Gordon wrote:
Today, I connected the audio output of my transceiver, a Yaesu FT-890,
set to AM-wide, tuned to 3580 KHz, into my computer and fired up
Spectran is exhibiting a very wide-band series of peaks in the noise
which appear to be multiples of 60 Hz.
You are seeing harmonics of the AC power line. This is an indication of
improper bonding of your equipment. Study
http://k9yc.com/GroundingAndAudio.pdf The simple rules are: 1) Get power
from everything in your station from the same AC outlet, or outlets in
the same backbox, or from outlets whose Green wires are bonded together;
2) Bond from chassis to chassis of every piece of equipment that is
interconnected by short, fat copper; 3) Bond from your TX chassis to all
the other grounds in your home.
73, Jim K9YC
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