[Hallicrafters] SX-111 RF Alignment

[George KB2Z]

Bill,
Do yourself a favor and leave the soldered trimmers alone.
73, George KB2Z

At 03:36 PM 11/28/04 +0500, you wrote:

>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/
>
>
>
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