I mostly use WSJT-X on 6M, and have several neighbors who, depending on
the directions of our beams at any given time, can be as strong as 40 dB
over S9. I run a K3 with AGC set to Slow, so if I set drive to the
decoder at 30 dB, any station weaker than about 15dB over S9 will be
below the level of the A/D. At times, and in certain directions, I'm
also blessed with a noise level of S5 or less (and, at times, 20 dB
higher).
To keep those S5 and lower signals within the range of the A/D, I've got
to drive the sound card a lot harder. I use a sound card (Tascam US100)
that has LEDs to indicate Green for signal presence and Red for digital
clip. This has caused me to adopt the practice of setting level to the
decoder in the range of 60-70 dB, keeping those weaker signals within
the range of the A/D, while allowing me to also decode those stronger
signals without having to ride RF gain.
73, Jim K9YC
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