[Lowfer] Thank you !

[Lyle Koehler]

I'll second Bill Ashlock's comments about using the rig's CW filters in
front of Argo. With a 16-bit sound card, there should be 96 dB of dynamic
range. In theory, that should be enough to allow pretty weak signals to be
detected in the presence of very strong carriers. In practice, strong
carriers within the receiver passband can do a number of bad things: capture
the receiver's AGC, affect Argo's AGC, overload the receiver audio stages,
overload the sound card input, etc. Except for the possibility of ringing
that Bill mentions, I feel that it's best to use the narrowest receiver IF
filter that will handle the bandwidth of the desired signal. When you're
receiving QRSS60 stuff, that can be pretty darned narrow!

The IC-756PRO that I recently acquired has steep-skirted DSP IF filters that
can be set for bandwidths as narrow as 50 Hz. Normally I use the narrowest
bandwidth, but if there are lots of static crashes I pick a wider filter
setting, like 500 Hz, and then use the passband tuning to produce a filter
with 100 Hz bandwidth and somewhat wider skirts to reduce ringing. On the
IC-706, which has only the 2.2 kHz and 250 Hz bandwidth options installed, I
*always* use the 250 Hz filter for QRSS or WOLF reception.

Lyle, K0LR