[Hallicrafters] SX-101MK3 AGC

[Carl]

That sounds about right as they are attempting to use a 6CB6 sharp cutoff 
tube as the RF amp. It sure shut down that stage but the IF amp is still 
conducting and the pumping clipping action isnt very good for IMD.

 The 101A was much improved with a 6DC6 and a revised AGC

Carl
KM1H


----- Original Message ----- 
From: "Eric Lawson" <elawson at inficad.com>
To: <hallicrafters at mailman.qth.net>
Sent: Monday, December 06, 2010 12:32 PM
Subject: [Hallicrafters] SX-101MK3 AGC


> Does anyone know the AGC voltage range on a SX-101 MK3 from "no
> singal" to full signal?
>
> On mine, right now, I'm seeing a 0, for no signal to about -10V for a
> fully railed AGC.
>
> I'm chasing down some strong signal (about -70dBm at the antenna
> input) issues that seem related to the AGC system...motorboating when
> notching out a strong carrier, distortion at the detector output and
> some possible LO pulling....
>
> Eric
>
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