[Hammarlund] SP-600 HFO Alignment

[Richard Knoppow]

    Puts a bump in the calibration. Remember, the tuning 
capacitor is non linear. When a symmetrical air capcitor is not 
centered the capacitance at any point is increased but the amount 
depends on where you are on the curve. You can tell when the cap 
is exactly centered because the capacitance will be at a minimum. 
The error will also affect the tracking of the RF stages.

On 3/24/2020 11:00 AM, Roy Morgan wrote:
> To all,
>
> Are there any reliable reports on how the performance of the radio is actually affected if the tuning cap plates are not centered axially?
>
> -Bad frequency alignment?
>
> -Disrupted tracking?
>
> Roy Morgan
> K1LKY Western Mass
>
>> On Mar 24, 2020, at 12:34 PM, Richard Knoppow wrote:
>>
>> ...it is possible for the stators to drift out of centering. Easily fixed without damaging the capacitor.
> ...
>> The tuning cap must be removed. Tedious ...
>>> On 3/24/2020 8:11 AM, k2cby at optonline.net wrote:
>>> I would repeat in boldface underlined Never bend the plates of the tuning
>>> capacitor! It is undoable and a death sentence so far as proper alignment is
>>> concerned.
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL