[ARC5] Crystal tester.

[Richard Knoppow]

    In the article I linked Virgil Bottom writes about the testers 
developed for crystals. There were really no standards before the war. 
The first tester was very elaborate.
    The Millen GDO works like a charm for testing crystals plus the best 
load capacitance can be determined by measuring the exact frequency on a 
counter and also looking at maximum current on the meter. The frequency 
dial has a logging scale which can be calibrated for capacitance.
    Some GDOs will not work, for instance the AN/APM-10 which has other 
stuff in the plug ins beside the coil. I suspect many work as well as 
the Millen.

On 6/11/2016 4:58 PM, Rich Post wrote:
> The military used this one (TS-39B/ TSM-1) and likely some other crystal
> testers
> <http://www.ohio.edu/people/postr/bapix/TS-39B.htm>
>
> You can also simply plug a crystal into a grid dip meter in place of a
> coil and check the freq on a counter.
>
> A third method is shown in the third picture down, using a sig
> generator, scope and counter.
> <http://www.ohio.edu/people/postr/bapix/SigGenFun.htm>
>
> Rich KB8TAD
>
> On Sat, Jun 11, 2016 at 6:56 PM, Kenneth G. Gordon
> <kgordon2006 at frontier.com <mailto:kgordon2006 at frontier.com>> wrote:
>
>     __
>     Wayne:
>
>     The military had a good crystal-test unit, but I cannot remember its
>     nomenclature.
>
>     --  --
>
>     Ken W7EKB
>
>     <http://www.qsl.net/donate.html>
>
>
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL