[Hammarlund] HQ-170A oscillator alignment

[Richard Knoppow]

    There are a couple of factors: Normal adjustments for the ends of 
the bands are the coil and the trimmer capacitor. Some sets also have a 
padding cap which affects the calibration in the middle of the range. 
Mid band accuracy is also affected by the position of the dial. There is 
a usual marker to set the dial for maximum frequency with the tuning 
condenser fully meshed.
    Another factor, although not too common, is the centering of the 
rotor in the stator. The "law" of the capacitor depends on this. if the 
bearing has been fussed with the rotor may no longer be  centered which 
will throw off the entire calibration. If the calibration is off on all 
bands in a similar way this is something to check on.

On 2/2/2024 5:54 PM, Jeff Sapko wrote:
> Hello -
> 
> Looking for some advice - I have a HQ-170A that has had the Golden 
> screwdriver treatment on the Oscillator coils by a former owner, and I'm 
> trying to get the dial to track properly.
> 
> Wondering if there is any trick to getting the linearity set right.  I 
> have the proper tools and equipment, but I simply can't get the dial to 
> track throughout the full band spread.  I'm presently working on the 40 
> meter band.  Every time I adjust the coil, it throws off the tracking. 
> Adjusting the capacitor at the top of the band sort of brings it back, 
> but then disrupts the run below 7.2 MHz.  This is getting extremely 
> frustrating...
> 
> I'm considering just running the coil and the capacitor out to their 
> minimum ranges and start doing quarter turns on each -- which is how I 
> have had to do some Hallicrafters SR series coils when they've been 
> butchered.
> 
> Is there any trick though that would reduce the knob twisting that 
> anyone can share?
> 
> thanks
> 
> Jeff
> 
> WB3JIH
> 
> 
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-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998