[Milsurplus] [ARC5] [armyradios] BC-221 Coupling

[C.Whitaker]

de WB2CPN Again,
I know that at one point in time the books were made
by a automated machine and a frequency counter.
The machine was connected to the main knob on
the 221, and it incremented the knob.
The freq counter fired a printer.
73  Clete
++++++++++++++++++++++++++++++++++++++
On 11/14/2012 9:13 PM, J. Forster wrote:
> 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
>>
>> ______________________________________________________________
>> ARC5 mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/arc5
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:ARC5 at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>