[Hallicrafters] S-120 Tuning Questions

[Edward B Richards]

Hi Joe;

I have aligned at least one that I remember. I don't recall any problem.
You have to keep going from end-to-end on each band adjusting the coil
for the low frequency end and the trimmer cap for the high frequency end.
You may have to do this 10 times. If you over correct, you won't have so
far to go next time. e.g. Set the dial for 600 kc when adjusting for 590
kc. Does this not work? If not, why not ? Running out of coil or trimmer?
Let us know. Good luck.

73, Ed Richards K6UUZ




On Sun, 2 Jan 2005 14:51:24 EST Wj5mh at aol.com writes:
> A month ago I purchased an S-120 at a garage sale, and I just 
> finished  
> refurbishing it.  However, I seem to have a problem with tuning  
> actually matching 
> the dial scale ON ALL BANDS.  Even after an  alignment.
>  
> This may be a clue.  I noticed that the dial pointer would not fully 
>  move to 
> the left end of the dial (under the zero of the band-spread marking) 
>  when 
> the tuning cap was set to max capacitance.  I managed to release  
> the tabs, 
> remove the glue and slide the pointer to the left.  Now, the  
> pointer moves from 
> one end of the dial to the other, matching min and max  settings of 
> the tuning 
> capacitor.
>  
> I carefully followed the alignment procedure starting with the 
> broadcast  
> band, but was unable to get the dial to match after working with the 
> trimmer cap  
> and inductance settings numerous times.  Example:  1300 kHz at  1300 
> kHz, but 
> 590 kHz on the low end would be 560 kHz.
>  
> Working with the other bands generated about the same  results.  
> Example of 
> band 3: 10 MHz would be OK, but 5 MHz would show  as 4.7 MHz.  40 
> meters would 
> actually show up as 6.7 MHz.
>  
> I was thinking that the dial string could be causing the problem, 
> because  of 
> some string diameter to cap rotation ratio, but the string looks  
> original.  
> (It's small diameter and white.  Band-spread is larger  diameter and 
> black.)
>  
> Whatever it is, it's affecting all bands.  I know it's a cheap set,  
> but one 
> would expect to dial to be a little closer than it is.  If you've  
> worked on 
> one, what's been your experience?
>  
> I'm using high-side injection for all bands.  To receive a station 
> at  11 
> MHz, the oscil is set to 11.455 MHz.  (I don't even know if this is  
> correct 
> since I started from scratch with the alignment after trying to 
> touch up  the 
> alignment the first time.)  Oscillator signal sounds clean on an  
> external 
> receiver.  The S-120 seems to receive fine.
>  
> Thanks,
> Joe
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