[Milsurplus] Please point in the correct direction

[Mark J. Blair]

On Sep 26, 2010, at 6:38 PM, John Hutchins wrote:
> I purchased a James Millen GDO to help, resolve possible problems, check 
> the coils Q at rated frequency.
> 
> The GDO 90651 it self has problems ... cant win.
> Symptoms : as you roll the thumb wheel forward to increase frequency the 
> needle increases from 0 towards 1 ma
> the reverse is true, the needle falls as the thumb wheel decreases 
> frequency.  Symptom is the same on all bands, plug in coils.

The only GDO I've used is the PRM-10, but if I recall correctly, a GDO isn't much more than an oscillator with a meter to check the plate current, so that you can see a dip caused by external loading. I think the first thing to check would be to see if the GDO is oscillating at all, and whether it's doing so at or near the dialed-in frequency. Your BC-348 (or any other HF receiver) should be able to hear the GDO loud and clear if it's oscillating like it should.


-- 
Mark J. Blair, NF6X <nf6x at nf6x.net>
Web page: http://www.nf6x.net/
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