Hi,
I have a K3, and am seeing what looks to be some sort of unknown, and
unexpected AGC action when I have AGC off, on both the K3, and within
Windows.
I am trying to triage this to the radio, the computer, or WSJT-X.
Here are the test conditions:
WSJT-X used as the software for testing. K3 is feeding audio directly
to the computer via a USB cable, Windows 10. I believe I have AGC off
in Windows...
Here is what makes me question the AGC:
1. K3 bandwidth set to 4KHz.
2. WSJT-X showing 0-4000 Hz in waterfall.
3. If I reduce bandwidth using the control on the K3 I see:
a. A reduction in the level shown by WSJTX input meter.
b. An INCREASE in noise on the waterfall.
This is totally unexpected to me... I would expect to see the waterfall
stay the same brightness, and the waterfall width reduce, while the
input meter drops. Why the brightness change? Is this happening within
WSJT-X?
--
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
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