[Hallicrafters] SX-111 RF Alignment

[Bill Gerhold]

Gentlemen,

I am in the process of performing an IF and RF alignment on an SX-111
receiver.  The IF alignment was fairly easy and resulted in a good 
improvement in the receiver sensitivity.

However, I have just started the RF alignment and I have run into a
problem.
The problem is the following capacitor oscillator trimmers.  C53, 55,
57, 59, 60 & 63.  These trimmer caps are of a design I have never seen
before.
They are tubular in shape.  The capacitor tuning slugs(?) ends are not
slotted to accept a tuning tool, but come to a point like a nail but
they do seem to be threaded.

In addition, the shafts are soldered to hinder movement once set at the
factory.  I can unsolder them but I need some advice and information on
how these capacitors are tuned/turned to alter their values.  Anyone
have any ideas on this?


P.S.  The IF on the SX-111 and other Hallicrafters receivers use a
50.75khz IF.  I used a wonderful piece of test equipment to make sure
the signal generator was right on the money.  An ICOM-756pro.  Makes a
great piece of lab equipment.

  73 from K2WH  
Hallicrafters, The Radio Mans Radio
            http://www.w9wze.org/
   http://groups.yahoo.com/group/The19Group/