[time-nuts] Looking for OCXO

Bob Camp kb8tq at n1k.org
Fri Feb 26 12:15:24 UTC 2016


Hi

If you put a filter on the output of the DIP (or other pkg) XO, you can demo a 
sine wave into a scope as well as a square wave. You will likely need a generator
to power the scopes if it is outdoors so consider that as well. Not all generators supply 
nice clean power ….

Bob


> On Feb 26, 2016, at 3:20 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> jdownj at gmail.com said:
>> I'm going to be taking some oscilloscopes to a hamfest this summer, and I
>> am going to have a truck full of stuff anyway, and would like to avoid
>> hauling  my signal generator to provide a demonstration of the scopes. Does
>> anybody  have a 50MHZ+ OCXO or other oscillator with a coax(sma/bnc) that
>> they would like  to part with? Something that doesn't meet time nuts
>> standards is perfectly  fine, just want something that is faster than the
>> built in calibrator on the  scopes. 
> 
> Do you have any of the standard 14 pin dip osc packages in your junk 
> collection?  You can probably run one off a pair of AA batteries.  The square 
> wave output would be good for showing what a scope can do.  Most of the not 
> high frequency osc packages have slow rise times.  You might want to run it 
> through a buffer.  A non terminated connection on a few feet of coax will 
> give you nice reflection spikes to look at.
> 
> The best scope demo toy I ever saw was a Tek giveaway.  It was a burst of 
> high frequency stuff with a low rep rate.  There are all sorts of 
> opportunities for aliasing with digital scopes.
> 
> The old skier avalanche beepers work pretty well too.  Their burst is 
> something like 455 kHz modulated at 2 kHz.  (I think they changed the 
> frequency 10 years ago.)
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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