[Milsurplus] The BC-221N Freq Meter calibration.

[Paul Thekan]

Mark

 Curious to know if you recall if some of the opened boxes with the LM freq
meters if they were repainted gray?
Tnx
Paul
N6FEG

On Sat, Feb 3, 2024, 11:15 AM Ken Gordon <kgordon2006 at frontier.com> wrote:

> On 3 Feb 2024 at 13:16, David Olean wrote:
>
> > I spent some more time with the BC-221N SN: 3719.    I tried a few
> > different coil cover spacings. My first attempt was about 0.082" and
> > The freq span shrunk a bit too much, so I shaved it down to 0.072. It
> > hardly moved, so I tried just two 0.040" washers and now I am short by
> > only about 1.2 divisions. How cool is that. I think I will wait and
> > see how it all holds up, but 1.2 divisions out of 4541 divisions of
> > travel is pretty darned close in my book.  I'll get the right
> > dimension with some fine tuning, and the dial should track
> > perfectly.  My new Cal Book should work out great. I'll enter all the
> > 10 KHz spacings into a spread sheet and then generate interpolated
> > readings between the 10 kHz points.
> >
> > Dave K1WHS
>
> Dave (and others):
>
> I believe I still have a computer program here which was originally
> designed to replicate or
> replace missing calibration books for the LM and BC-221 meters.
>
> It is quite old, and I suspect that modern software will work at least as
> well, if not far better.
>
> I'll dig it out and send you a copy of it for your perusal, if you are
> interested.
>
> Just let me know.
>
> Ken W7EKB
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