[ARC5] [armyradios] BC-221 Coupling

[J. Forster]

I have an Excel file that makes the books, but I'm not sure if it's a
generalized solver or for a specific unit, as I've not really looked at
it. It appears to interpolate regularly spaced readings, given a slope and
intercept.

I know there are programs on the web to generate the books from measured
data.

-John

==========




> On Wed, 2012-11-14 at 20:21 -0500, Jay Coward wrote:
>>
>>  But then if you have one that has no cal book and  you can "cal" it
>>  against another with a cal book for the frequencies  of interest then
>>  maybe you might find that as a useful experimenting  platform.    I've
>>  always thought the LM could make a really hot regen  rx with the
>>  proper mods. When the 80 and 40 bands are long and quiet  I've hooked
>>  the long wire to the LM and had very good clear copy,  although low
>>  audio.  Jay
>
> Hi Jay,
>
> A missing cal book is no reason to chop a LM or 221. A new cal book can
> be made fairly easily with the help of a spread sheet and a couple of
> cups of coffee. A new cal book could be made before that. In fact the
> originals were made with a personal computer to help. If they could do
> it in the 1930s it can probably still be done.
>
> There are some fellows who built regens and direct conversion receivers
> based on an old LM or 221. The way you described using yours was about
> the same as a DC receiver but not optimized for that.
>
> My heterodyne frequency meters shall remain on duty as heterodyne
> frequency meters until my heirs deal with them some day. I have looked
> for LMs and 221s that are "beyond repair" to use for parts in other
> projects. I haven't found any that can't be repaired. Anybody? That's a
> challenge. Send your "beyond repair" LM or 221 here for 'burial'.
>
> 73,
>
> Bill  KU8H
>
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