[Kenwood] comments on 2000 rig

[Mike Feher]

Noise blankers by their very nature introduce distortion. Whatever the
method, be it clipping, filtering, pulse deleting, or any other, it will
alter the intended signal received. This is of course if there are signals
to cause the threshold of the blanking detection circuit to become active.
If the noise suppression circuit is prior to the final detection bandwidth
it will cause splatter or harmonics that will very well distort the in-band
signal as well. If it is in-band to begin with, well, then obviously it will
modify the intended signal also. DSP can do marvelous things, but no more
than their analog equivalents. The only advantage of DSP over analog is
consistency in results, immunity to thermal effects, hence, repeatability,
and easy changes in coefficients to change desired characteristics. Of
course size and power consumption is not the subject of discussion. 73 -
Mike

None of the above is copyrighted!!



Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193


----- Original Message -----
From: <jhinkle@att.net>
To: "Dave Edwards" <kd2e@comcast.net>
Cc: <kenwood@mailman.qth.net>
Sent: Thursday, October 31, 2002 4:32 PM
Subject: Re: [Kenwood] comments on 2000 rig


> I disagree Dave, the 520 and 820 both have excellent, distortion free
> noise blankers. The later Kenwoods also had good blankers, but you had
> to adjust the threshold properly.
>
> 73, Jim W4KWD
> > 520S, 820, 830, all add distortion.
> > ...Dave
> > ----- Original Message -----
> > From: "Robert Lyons" <boblyons@umich.edu>
> > To: "Dave Edwards" <kd2e@comcast.net>
> > Cc: <>
> > Sent: Thursday, October 31, 2002 12:40 PM
> > Subject: Re: [Kenwood] comments on 2000 rig
> >
> >
> > > Dave Edwards wrote:
> > > >
> > > > Not particular to the 2000.
> > > > Noise blankers on every rig I've ever used cause distortion, and
should
> > > > NEVER be left on.
> > >
> > >
> > > Perhaps that's a characteristic of DSP-based noise blankers. On my old
> > > TS520, I left the NB on all the time, with no ill effects.
> > >
> > > - Bob, KI8AB