Mark,
My software reports power as sent to it from the Pegasus firmware.
I believe the power reading is just fluctuating at the audio frequency
driving rate.
It is just getting snapshots of the power based on random instantaneous
power level samples by the firmware in response to power requests
from my software. This would account for the varying readings. Your
wattmeter cannot respond fast enough to show variations at the microsecond
level.
Carl Moreschi N4PY
cjm@qvssoftware.com
----- Original Message -----
From: "Mark Erbaugh" <mark@microenh.com>
To: <tentec@contesting.com>
Sent: Wednesday, November 08, 2000 9:28 AM
Subject: [TenTec] Power display on Pegasus
>
> Last night, I finally got my Pegasus on PSK. When adjusting my radios for
> PSK transmit, I go through the following steps to set the proper ALC
level.
>
> Into a dummy load (of course)
>
> 1) Set the radio to max TX power
> 2) Set the PSK program to TX in idle mode
> 3) Adjust the computer audio out until the power reading on the radio just
> peaks
> 4) Back the computer audio down until the power is half of the peak
reading
> 5) Reduce the radio TX power to the level I want.
>
> This procedure seems to give me a clean signal.
>
> Anyways, while trying that with the Pegasus, using the N4PY software (v
> 1.38), I noticed that on the computer display the power output was
> fluctuating rapidly. A PSK signal at idle should be a perfect two-tone
> signal so it should be constant amplitude. The meter on my antenna tuner
did
> indicate a steady signal.
>
> 73,
> Mark
>
>
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