Andy obrien wrote: > From time to time we have had discussions here about the problem with > PSK (and other modes) when a strong stations appears to grab the > waterfall and wipe out all the other stations within a 2-3 Khz range. > Because of this phenomenon, when I purchased a new rig, I looked for > one that could have AGC totally off (when needed) and one that can > employ narrow DSP filtering. I must say that I have not really solved > this issue . I can see a marginal difference with AGC turned off but > strong signals still essentially desensitize other stations in the > waterfall. The DSP features do better and I can get rid of the > phenomena by turning to a narrow filter. However this does not help > if the offending station is with 300 - 500 Hz ( a lot when dealing > with narrow digital modes). > > Does anyone have any advice on how to once and for all solve this > issue? My rig is a TS2000 IF DSP is much better at handling this than AF DSP. On my IC-746Pro, the AGC sees only signals that make it through the filter, which can be narrowed to 50hz. Allowing for the sharp slope setting, this is pretty effective at limiting to about 100hz down to about 25db down from the peak.
Of course, you can't fix a splattered signal that is actually interfering on the frequency where your weaker target it. Nothing can fix that except to clean up the transmitter that is battering the spectrum.
