[Hallicrafters] SX-101 AVC

[Kenneth G. Gordon]

Tom Dailey wrote:

> Howdy Gang,
> 
> Some time back, there was a thread being discussed, re. the AVC voltage in
> an SX-101 & it's effect on the "S" meter zero.

<snip>

... anybody got any ideas?
> 
> Tom - WØEAJ - Denver

Tom, and others:

In the last two issues of Electric Radio mag there are two parts of an 
excellent multi-part article on restoring the SX-101 in which the AVC 
problem is addressed in great detail.

Hallicrafters engineers made a mistake in where and how the AGC 
voltage is connected: first, they connected it to the mixer, which causes 
the oscillator to pull on strong signals, and secondly did NOT connect it 
to the RF amp stages, which contributes to overload.

The article also addresses the "S" meter zero problem, among many 
others.

IMHO, it is "must" reading for anyone who wishes to get the most out of 
the truly excellent SX-101.

You can read about it at www.ermag.com. You can also subscribe 
there, or buy back and current issues.

Ken Gordon W7EKB