[Hallicrafters] Help with mechanical analysis

[Mark Johnson]

John, I experienced this on two different SX-100's.

The first one was a simple fix, but believe it or not a challenge to find. 
It was imperceptible, but the set screw on the bandspread tuning dial was 
loose. A simple tightening of the set screw was all it took. When first 
observed it, it did not look loose so I passed over it.....From now on I 
always tighten those screws when working on a new project....

The second SX-100 was actual slack in the steel dial cord. I chose to 
replace it as it was also fraying. I found the steel  "string" at a local 
craft supply store. The steel string is used to make beaded bracelets or 
necklaces. They had varying sizes of the cord and they also sold the 
necessary clamps to clamp the string ends. Very tiny of course. That worked 
out well and it was not that difficult to replace as the manual shows how to 
re-string the dial cords.

Watch also for dial shaft looseness on the wear points.

Mark V Johnson VE3LU/VE3DJU
----- Original Message ----- 
From: "John King" <k5pgw at yahoo.com>
To: <Hallicrafters at mailman.qth.net>
Sent: Thursday, December 30, 2010 9:32 AM
Subject: [Hallicrafters] Help with mechanical analysis


> Now recapped, my SX100 works very well. Problem left is a mechanical one. 
> The
> problem is in the steel band spread dial "cord"/cable.
>
> There is no slack in the band spread dial cord/cable when tuning from low
> frequency to high frequency end of dial. However, when starting to tune 
> from
> high frequency to low frequency there is an immediate SLACK that develops 
> in the
> steel dial cord/cable. This makes tuning SSB very SLOPPY. The bandspread 
> tunes
> SSB well when turning the bandspread knob upward  in frequency and the 
> slop is
> there when tuning downward in frequency. This looseness was observed when 
> tuning
> down in freq because of the sloppy tuning that makes bringing in a SSB 
> clearly
> very difficult.
>
> My request is whether anyone has experienced looseness in the metal 
> bandspread
> dial cord/cable in the SX100. If so how did you tighten it up to remove 
> the
> slack?
>
> If you have time and don't mind and if you have an SX 100, would you 
> please look
> at your metal bandspread dial cord/cable and see if you can figure out how 
> to
> snug up the dial cord/cable without destroying it. This slack problem 
> needs to
> be eliminated so I can complete the refurbishing of my receiver and get it 
> back
> into the cabinet and off the bench. Your assistance will be greatly 
> appreciated.
> Thanks and 73, John, K5PGW
>
>
>
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