[TenTec] AGC thump

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Hi Paul:

         I work some CW and years ago when we had the old receivers
we would turn down the RF gain and increase the audio gain a bit for
cw work.  The trama of the AGC circuit receiving the CW signal is
more than it can handle.  Most CW operators turn down the RF
gain and you will notice that the noise level goes down some too.
   Happy CW operating, the CW round table you will have to turn
the RF gain up and down some as all are not the same signal strength.

Ed  73  K7DXV
ewell at cvc.net


----- Original Message -----
From: "Clark Savage Turner" <csturner at slonet.org>
To: "Paul K9OT" <k9ot at mhtc.net>
Cc: <tentec at contesting.com>
Sent: Wednesday, March 12, 2003 9:04 AM
Subject: Re: [TenTec] AGC thump


> Hi Paul -
>
> Oh, heck, if it doesn't bother you why worry?  (Remember MAD magazine
> and Alfred E. Neuman with his "What, Me Worry?"   My dad always thought
> I was a little like Alfred!)  I tried out a "mod" to the AGC on an
> Argosy II and it killed the QSK sharpness.  I didn't like it, the AGC
> went "soft" on me.
>
> The "thump" is when you are listening to a quiet band, then suddenly a
> big signal (over S9) comes up and the receiver gives a "pop" at that
> instant.  Not a big deal, doesn't bother me much either.  When you take
> down the RF gain it will disappear (takes the signal to the bottom of
> the AGC range) so that will "solve" it anyway.
>
> I notice a bit of a thump on transmit also, but it is not a big deal to
> my ears, just a minor result of that wonderful QSK of a Ten Tec.  I
> believe the engineering tradeoffs of very fine QSK (biggest priority:
> allowing me to hear the band in between my transmissions)  don't quite
> involve perfection, but give me just what I need ... and better than
> other kinds of transceivers.
>
> Clark
> WA3JPG
>
>
> On Wednesday, March 12, 2003, at 06:35 AM, Paul DeWitte K9OT wrote:
>
> > Having read several references to AGC thump, I am not sure what it
> > sounds
> > like. My Corsair II on transmit will have a thump on keying. If I turn
> > down
> > the AF gain or the RF gain the noise will dissappear. Is this what is
> > refered to as AGC thump? My Omni D has none of this. Smoothest cw rig
> > that I
> > have run yet.
> > If this is what is referred to as AGC thump, do any of the mods that are
> > around get rid of the thump and still retain 100% of the breakin?
> > Maybe I have an entirely different problem? I can live with it but
> > would be
> > nice to get rid of the thump.
> > Thanks 73 Paul K9OT
> >
> >
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>
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