On the Viewsonic monitor--
My 17" Viewsonic monitor is pretty RF quiet; it is now 6 years old. I dont
know
about current large monitors,i.e. 21" but they didnt use to be class b
interference
rated which can make a huge difference.
k7puc
-----Original Message-----
From: Larry Kayser <kayser@king.igs.net>
To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Wednesday, February 09, 2000 7:40 PM
Subject: [TenTec] Pegasus, bad audio, bad CW note, Wow!
>
>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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>
--
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