[Hallicrafters] SX-111 RF Alignment

[Edward B Richards]

Hi Bill;

I am not familiar with the slugs in the SX-111. There are basically 3
kinds of slugs: 1) Slugs that have a long threaded rod attached that is
notched in the end to take an alignment tool, 2) slugs that are solid
with a notch in the end to take an alignment tool, 3) slugs with a hex
hole all the way through them to take a hex alignment tool. Type1 are
held in place by a sheet metal nut around the brass screw and seldom
stick. Types 2 & 3 are usually held in place with wax or a plastic strip
that engages the threads. If the wax type, heating with a hair drier will
soften the wax and may free them. Type 3 sometimes stick because
excessive force has split the slug lengthwise and attempts to turn it
only spreads the halves and make it jam tighter. The only solution is to
carefully break up the slug and remove the pieces and install a new slug.
Good luck.

73, Ed Richards K6UUZ


On Fri, 31 Dec 2004 09:11:24 -0500 Bill Gerhold <k2wh at optonline.net>
writes:
> I have decided to re-do the alignment on my SX-111 due to various 
> problems
> with receiving.
> 
> The alignment includes adjustments to various coils in the front end 
> prior
> to the 1st RF amp.  Some of these are way out of resonance and need 
> to be
> adjusted.  For instance, the 10 meter band is resonant at 25mhz.  
> The 15
> meter band is resonant at 19mhz etc.  I am trying to get a match to 
> the
> first RF stage to improve the sensitivity.  And yes this mismatch is 
> there
> even when adjusting the trimmer cap on the front panel 360 degrees.
> 
> I have tried to adjust these coils front end coils, but the cores 
> will not
> turn.  Apparently they are either glued or cemented in place (I 
> think).  I
> would like to free these up so I can adjust them.  Does anyone know 
> how to
> free up the cores in these front end coils?  Would a drop of solvent 
> or
> WD-40 damage the form?  Were these cores cemented in place at the 
> factory?
> Any ideas would be helpful.
> 
>          Bill Gerhold, K2WH 
> Hallicrafters, The Radio Mans Radio
>             http://www.w9wze.org/
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