[ARC5] Frequency Standard

[J. Forster]

A VOM and a BC-221?  For convenience, one of the purpose test sets. That's
enough to repair all but the most subtle problems.

Beyond that, a sweeper and a 'scope.

-John

================


> Hello David,
> I'm more than interested in your comment about the frequency standard
> selling on eBay.
> I'm not writing from the point of buying this - it seems very limited
> from my point of view.
> My interest comes as a result of thinking about test gear for
> maintaining the ARC-5 sets.
> In particular I'm interested in how you use the TBX frequency standard,
> because it's very easy to build an 8MHz oscillator and divide the
> crystal down (4MHz, 2MHz, 1Mhz, 500kHz, 250kHz) and so on.  If you add a
> divide by ten chip after the 500kHz signal - bingo!  a marker every
> 50kHz well up to 30MHz.  I built one of these - it's useful.
>
> This "thing" gives me a calibration points for the dial and front end.
> BUT - and this is a big "but" ...
> The oscillator lacks any form of calibrated signal out for the IF stages
> (85kHz, 705kHz, 1415kHz etc).
> It also lacks an attenuated signal to calibrate sensitivity.
> Your set may be deaf or sensitive, but without a calibrated signal
> source - it's all a guess.
>
> So - what other test gear do you use on the bench?
> What do you (and other group members) see as the MINIMUM test gear to
> adequately service these sets?
> I'm interested in getting an answer to this question from two points of
> view.
> This is the person who has a collection of "nice" test gear (eg HP-606B,
> Fluke frequency counter) and a technically informed but equipment-poor
> person - someone who might put together basic test gear from a kit.
> What's in the basic kit?
>
> Best 73s etc
>
>
>   Leslie Smith
>   vk2bcu at operamail.com
>
>
> On Mon, Feb 20, 2012, at 05:47 PM, David Stinson wrote:
>> If you're serious about operating WWII radios,
>> these little TBX frequency standards are "worth their weight."
>> It's one of the top-5 pieces of gear I use.
>>
>> http://www.ebay.com/itm/170784676767
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