[time-nuts] Looking for OCXO
hmurray at megapathdsl.net
Fri Feb 26 03:20:49 EST 2016
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.
More information about the time-nuts