[ICOM] IC-756PRO

[gfiber at comcast.net]

I suspect its the noise blanker clipping the signals causing a more of a square wave. Square waves are richer in harmonic energies and will cause symptoms like you describe. Probably the same thing happens on a strong nearby SSB signal. Actually it seems to be a fairly common issue with some noise blanker designs.

Others here may have better explainiations and cures as I don't own a 756PROII
Just have an IC-718.

Gary K8IZ
 -------------- Original message ----------------------
From: <ve4xt at mts.net>
> Hi all,
> 
> I have an IC-756PRO (not II not III, just PRO) with what appears to be a 
> systemic issue: when the noise blanker is engaged in CW, strong nearby 
> signals thump the passband.
> 
> It's as though the AGC was pumping in response. Is this something 
> others have noticed?
> 
> Turning the NB off appears to cure the problem, but until I noticed that, I 
> was starting to have reservations about this radio for CW.
> 
> Thoughts?
> 
> 73, kelly
> ve4xt
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