[TenTec] Pegasus, bad audio, bad CW note, Wow!

[Larry Kayser]

Greetings All:

A few days ago a nice new Pegasus arrived and after a few hours of fiddling
with it, putting it under the table, sitting on a nice regulated 20A power
supply, I decided to turn it on and see what gives.  I have been writing
some software for the new radio and courtesy of a long suffering fellow
Pegasus owner the basic stuff to get the radio going was sitting on my
amateur radio PC here.  The little Win 95 machine was connected the Pegasus
and the RX was happily listening to some CW on 20 Meters.

I reached over and turned on the big ViewSonic monitor on my development
machine to get some more software for debugging on the Pegasus and the
Pegasus went nuts.  The audio was instantly terrible, distorted and awful.
I turned off the ViewSonic and the audio returned to normal.

This has the potential to be a long story.  It wont be.

I reached under the table and turned the Pegasus 90 degrees.  Turned on the
ViewSonic and the audio never changed at all.  Moved the Pegasus two and
four feet sideways, then moved it forward and backward about 2 feet at a
time.  I could clear up the audio by moving the Pegasus as little as a foot
in some directions.  I moved the Pegasus beside the monitor, both sides,
above it, and there were spots were this monitor hammered the radio when it
was in close, farther away it did not bother the radio at all.  This monitor
also does a job on my MFJ Model 784 DSP filter, bad hum when the monitor is
turned on.

When I got my transmitting software working, I redid some of the experiments
and the Pegasus CW note could be adversely affected by the Monitor.

I have a new 90 Volt, 25 Amp power supply for a large Class D Power FET
amplifier I am building here and the transformer is a "recovered" from a
supply that had a resonant 60 hertz regulator feature in its previous life.
This transformer will upset the Pegasus instantly up to about 5 feet, then
it is not noticeable at all.

Who is at fault?  I am NOT going to blame the Pegasus radio, it is the new
kid on the block around this shack but that does not mean the current
residents are faultless!  The items that bother the Pegasus are also the
items that have bothered other things around here as well.

If you have a Pegasus and you get a lousy report on your CW note or the
receive audio is distorted then look around your own shack for the thing
that is causing it.

Larry
VA3LK




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