[Hallicrafters] SX-111

[wb8jkr at juno.com]

 Sounds like maybe the BFO injection level to the
product detector may be too low if its not an AGC
problem.

Mark  WB8JKR


On Sun, 02 Jan 2005 16:22:17 -0500 Bill Gerhold <k2wh at optonline.net>
writes:
> Continuing with my work on the SX-111 receiver, I solved the slipping 
> dial
> by making a thin rubber washer and inserted that on the tuning shaft 
> so when
> compressed, provides much more friction and has eliminated the 
> slipping.
> 
> A new problem (?) has shown itself but I'm not sure it is a problem 
> or just
> a part of the receiver design.  When listening to strong SSB 
> signals, S9 or
> more, a very distinct distortion or raspiness occurs to the received 
> audio.
> I'm thinking I may have and ALC problem but not sure.  If I turn the 
> RF gain
> down, the raspiness will disappear as long as I can hold the signal 
> below
> S9.  While not very objectionable, I would like to clean it up if 
> possible.
> 
> 
> I remember working on a KWM-2A a while back to modify the ALC 
> circuit for a
> fast attack and slow decay and it worked out very well.  I think 
> they called
> it ALC pumping or something similar.  Anyone with any ideas while I 
> have
> this receiver out of its case?
> 
>          Bill Gerhold, K2WH        
> Hallicrafters, The Radio Mans Radio
>             http://www.w9wze.org/
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