[ARC5] [Milsurplus] WTB Original LM-10 manual

[DaveJ]

All:

I have a pdf a photocopy of the BC211 calibrator article in Electronics Magazine, May 1944 issue if someone wants it.  

It is also downloadable from World Radio History.  Search for "Electronics"

https://worldradiohistory.com/Electronics%20_Master_Page.htm

Electronics Magazine, May 1944 issue


sincerely,


Dave WA4OBJ

-----Original Message-----
From: arc5-bounces at mailman.qth.net On Behalf Of Bob kb8tq
Sent: Friday, March 25, 2022 11:08 AM
To: Kenneth G. Gordon <kgordon2006 at frontier.com>
Cc: Jack Antonio <scr287 at att.net>; Roy Morgan <k1lky68 at gmail.com>; ARC-5 <ARC5 at mailman.qth.net>; Milsurplus <milsurplus at mailman.qth.net>
Subject: Re: [ARC5] [Milsurplus] WTB Original LM-10 manual

Hi

However impressive the cal setup is in the pictures, it was even more impressive in real life. I came across a good portion of one in a surplus outfit *many* years ago …..

Bob

> On Mar 25, 2022, at 1:57 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
> On 25 Mar 2022 at 13:38, Robert P. Meadows wrote:
> 
>> Folks, To the best of my memory and knowledge, the LM series of 
>> "frequency meters" were individually calibrated, and the book for 
>> same serialized to the instrument. I have memory of a photo of the 
>> calibration setup, as well as the printer that made the calibration 
>> books.
> 
> Yes. That is correct. The calibration books are unique to each 
> "freqency meter". And I too remember seeing a photo of the calibration 
> equipment at the time. It was quite large. The technology of the time was quite impressive too.
> 
>> Making a calibration book by any means absent the actual measurements 
>> for the specific LM is useless if the instrument is to be used with 
>> any degree of accuracy. R
> 
> Well, Bob Keyes' program does a good job of recreating a calibration 
> book, although the result can then be tweaked for better accuracy 
> after that is done by using a good, accurate, frequency counter at 
> selected frequencies. Making an accurate calibration book is a time-consuming process, but others have done it.
> 
> If you no longer have a DOS based computer to run it on, you can 
> install one of the DOS emulators on your computer and run it by that means.
> 
> Ken W7EKB
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