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Hi Mike,
you have probably selected Argo's visual
AGC button on the bottom left, which is on by default. This does not really
suppress interference, but scales each display column to the same average
brightness of the noise. So during a strong noise
burst, the brightness stays the same but the signals disappear.
Speclab also has a similar visual AGC option.
The advantage is that you wouldn't have
to adjust gain between day and night, but I rarely use it because I like
to see whether the signal went down or the noise went
up.
As you can guess, DCF (and also HGA) sidebands are
really big here. For the LF grabber I am using neither analog or digital AGC nor
clipper, just the SpecLab noise blanker alone. It gets the full SSB
bandwidth and is set to fast rampdown / rampup times (2 ms), so that it can
recover between individual clicks within an FSK bursts, minimizing signal
loss. The NB threshold is normally set to 9 dB above average.
Best wishes,
Markus (DF6NM)
Sent: Saturday, April 07, 2012 11:38 AM
Subject: LF: Argo vs SpecLab
I have recently being playing with
the settings in SpecLab, and have
managed to reduce the effect of some local
QRM. However, I am still
plagued by DCF39 data bursts. When using Argo
(1.3.7) these are
almost invisible, but SpecLab still displays
them.
I have the SpecLab Limiter set very hard, and the Noise Blanker on,
and this helps, but it is still nowhere near as good as Argo in
taking
out the data bursts.
Any ideas?
Mike,
G3XDV
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