[ARC5] BC-221 and LM calibration book

[Ian Wilson]

Ken,

If it was written in Fortran, then it will probably compile (and may run,
with some help)
on a Unix box. Worth a try, anyway.

73, ian K3IMW


On Fri, May 22, 2020 at 9:38 PM Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> On 23 May 2020 at 0:25, Roy Morgan wrote:
>
> > Ken,
> >
> > If you don’t find it I have it here.  There were updates from the
> original one Bob Keys wrote.
>
> Hi, Roy: I found it, but I don't know if it contains the updates you
> mention.
>
> Also, I attempted to run the .EXE file on my WIn10 box and was told,
> rather bluntly, that it would not run there. I have an XP-Pro box I'll try
> next.
>
> My versions were published by Russ Schroeder  W2DYY dated 9 Feb 96
>
> Is that the one you have, or is mine older than yours?
>
> BTW, Russ' notes include the followng:
>
> "The calibration book you generate will not be as accurate as an original
> book.  However, the maximum error in the HF range should be less the 0.5 kc
> at the ends of the range.  The maximim error in the LF range should be
> less
> than 50 cycles at the ends of the range. This error is due to a small
> nonlinearity in the capacitor manufacture."
>
> > I have both an SP-600 (not nearby but safe) and a BC-779 (here), so I
> > would like to collect full details on this crystal filter problem.
>
> I'm sorry, Roy, but I don't have the details on what Woody discovered
> about the filter.
>
> I DO remember, vividly, that he told me that if the filter is aligned
> correctly, as you reduce the bandwidth, the signal level should rise on the
> S-meter, NOT get weaker, since the S/N ratio is increased.
>
> I also remember that it took him some weeks to get what he expected and
> that he was very happy when it finally worked as he thought it should.
>
> This was at least 50 years ago, so I don't remember much about it.
>
> Ken W7EKB
>
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