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what is a rubbitin frequency standard?

On a sunny day (Mon, 19 Nov 2012 10:38:46 -0800) it happened Jeff Liebermann wrote in :

I just wrote a little Linux command line program in C to get the frequency, and set the frequency offset (and save it in the EEPROM in the thing if needed). It can set the offset of the 2,147,483,647 Hz oscillator by + or - 383 Hz, that seems to be the calibration range they specify.

As so often I wrote the soft without the thing around, so it probably needs more work. I will make this source available as soon as I tested it and it works OK on the real thing. The unit communicates at 9600 Bd, and basically accepts 3 commands: read frequency offset. set frequency offset (volatile), power down sequence will get the EEPROM value. set frequency offset and save in EEPROM.

If anyone wants to experiment with that soft now, contact me for the source.

So, from that it seems one could calibrate it against a GPS controlled clock. quote from their technical document (google TECHNICAL MANUA L TM0110-2): The frequency can be adjusted with a resolution of 1.7854E-7 Hz. For an FE-5680A device with an output frequency of 10 MHz, this corresponds to a relative frequency setting resolution of 1.7854E-14.

Reply to
Jan Panteltje
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Oops, of the synthesized output frequency I presume :-)

Reply to
Jan Panteltje

"Why do GPS receivers have a 1 PPS output?" See the last explanation at the bottom of the page. If you're using timing to track a missile, the longer the time interval between updates, the less a chance of cycle skips during loss of signal.

--
Jeff Liebermann     jeffl@cruzio.com 
150 Felker St #D    http://www.LearnByDestroying.com 
Santa Cruz CA 95060 http://802.11junk.com 
Skype: JeffLiebermann     AE6KS    831-336-2558
Reply to
Jeff Liebermann

range,

Now

A few of things:

Some of them ain't very with it; GOES is geostationary and NOT part of GPS which is not.

Why is the missile range engineer not using IRIG?

What engineer expects any micro to boot in less than a few microseconds with some variance?

'nuff said.

?-)

Reply to
josephkk

range,

Not sure what you are going on about. IRIG is a format for communicating time, but you still need a way to do the transmission. I can see where GPS would be used in any given application depending on what is easier to do.

Micros can wait for an input and be synchronized to within a single clock cycle. I know of one that can wake up asynchronously about a ns of the input.

Rick

Reply to
rickman

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