[Milsurplus] Re: Milsurplus digest, Vol 1 #754 - 16 msgs

Tue, 11 Nov 2003 10:45:51 -0500

Hi,

The calibration books for the LM's and BC-221's came off of a great big
machine. More or less it had a motor that drove the dial and a  racks of
electronics to detect the zero beats. The books printed off an overgrown
adding machine. Lots of cams, gears, and tubes. It must have been a major
issue just to keep the machine running.

I have never seen a manual or schematic for the monster machine. I'm only
guessing at what it did. I suspect they did the locked multivibrator thing
to get a series of frequencies to lock to. The approach was fairly common
back then and it would make the rest of the system a lot more simple. The
main time base probably would have been a great big 100 KC quartz bar in a
heated wooden case. State of the art for frequency standards back then.

    Take Care!

        Bob Camp
        KB8TQ

----- Original Message ----- 
From: <[email protected]>
To: <[email protected]>
Sent: Monday, November 10, 2003 12:24 PM
Subject: [Milsurplus] Re: Milsurplus digest, Vol 1 #754 - 16 msgs

> In a message dated 11/10/2003 1:06:01 AM Pacific Standard Time,
> [email protected] writes:
>
> > Anybody know how long the government used the BC221 and LM21 frequeny
> > meters?
> >
> >
> > - Greg
> >
> >
>
> In the late 70s I saw probably over a thousand overhauled LM freq meters
> being sold surplus at Alameda Naval Air Station. Huge quantity. They
looked BRAND
> NEW, flawless,  and had new calibration books. I had high hopes because
the
> same auction had hundreds of overhauled ART 13s in boxes stacked high
outdoors.
> A few of the boxes had been opened by curious bidders and all the ART 13s
> looked really bad cosmetically, crude painting, lots of dents and
scratches and
> even dirt oversprayed. Didnt give you much confidence that the overhaul
inside
> was very thorough. They were grouped in big lots so the purchase of one or
two
> was impossible. I think most of the ART 13s went for about $28 each in big
> lots and the LMs were about 8 or 9 dollars.
>
> Does anyone know how the calib books for BC 221 and LMs were made in WW 2?
> Did someone hand type each entry????
>
>
>
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