Fw: [HBR] HBR-16 / Eddystone Dial Calibration?

[waltah at earthlink.net]

Niel, W0VLZ wrote:
> The design includes a crystal calibrator but I see no
> provision to tweek the calibration point from the front panel. Is
> something built into the Eddystone dial that I missed or is the HBR-16 /
> Eddystone Dial calibrator for initial alignment only?

I seem to remember that the 'press' on this control was that it lead 
to more drift than it was worth.   

While it's true that these receivers will generally be off by 1 kcs or 
so on 80, and several times that on higher bands (which might be 
corrected with a front panel calibration adjustment), the dials can't 
be read that closely anyway.   You can't even get close with the 
5:1 National dial used on many of them and even the best of the 
lot, the Eddystone, can't be *read* to a kcs.   So it was a feature of 
limited value which at least some people thought caused a 
problem; I can imagine it was often omitted.

I did install one on the 1MHBR and it seems both okay drift-wise 
and slightly useful.   But at best, no more than a matter of taste.

I don't know that I'd even call the calibrator essential, except, 
possibly, on 20 and above.   You need one to mark the dial but 
after that, you just check and correct coils at the six month mark 
or so, and it can be forgotten.

Walt Hutchens
KJ4KV