[ARC5] Re: [Hallicrafters] Looking for an Electronics (magazine) article.

[Roy Morgan]

On May 26, 2008, at 5:32 PM, Waldo Magnuson wrote:

> ... Electronics, May, 1944, page 98. ... automatic calibration  
> computer made by Philco Corp. for making calib. charts for the  
> LM-221 frequency meter.
>

Waldo,
copy to ARC-5 mailing list,

I remember such a thing now that you mention it.  It might well have  
been more of a mechanically or electrically controlled printer  
device.  Each calibration book was created individually for the  
particular LM instrument.  Manuals warn about the trouble and expense  
of re-calibrating one if you mess with the adjustments.

Unfortunately:

- I'm pretty sure my collection of info on the LM does not have that  
article.

- and; where I *used* to work I could get that issue but I don't work  
there now.

I suggest you go to your nearest substantial library and look up the  
reference librarian. Then explore the possibility of an interlibrary  
loan of what will likely be a bound volume of that years issues.

On a very related note:

It may have been Bob Keys, or another fellow, a long time ago on the  
Boatanchors list wrote a real computer program to generate a new  
calibration book for an LM or BC-221.  The copy I got and have in the  
archive here had a drop dead date built into it, so now you'd have to  
reset the operating system date on an old computer to get it to run.   
You entered a series of calibration points you got from  your LM and  
the thing crunched out all the intervening points, along with harmonics.

> the article on the 1944 Philco calibration computer is for an  
> article I am researching and plan to write for the Electric Radio  
> magazine.

I can dig up the program and related info, and report later on.  You  
may want to contact the guy to see if he can contribute to your article.

Also: the fellows on the ARC-5 mailing list are particularly  
interested in WW-II radio history, and have an astounding amount of  
lore at hand.  The LM and BC-221, of course, are of that era. I'd be  
quite surprised if no one on that list has a copy of the article.   
(I'm copying that list on this reply to you.)

One of the earliest military radio things I collected is an LM from  
the Naval Air Station at Argentia Newfoundland.  I later went on to  
become a Naval Aviator, though I never went to Argentia.  But that LM  
is nice to have.  Not too long from now I'll unearth it and get it  
running again.

Roy

Roy Morgan
k1lky at earthlink.net
Lovettsville, VA 20180