IF the 1pps is accurate and stable, one could measure the time between
the GPS's 1pps and the 5680a 1pps and issue appropriate frequency
offset commands.
That's a big assumption or two, a Tbolt might still be cheaper.
There's always WWVB.
On 12/30/2011 11:39 AM, Robert LaJeunesse wrote:
How about USB to an FT232 that talks SPI to a low-cost DAC or digital pot? Would
need a stable reference, though. See http://www.sparkfun.com/news/386 and
http://www.chinwah-engineering.com/USB_SPI_Interface_Software.html for the
methodology. Could also use a parallel DAC via FT232 bit-banging, see
www.dlpdesign.com/images/bit-bang-usb.pdf
________________________________
From: Mark Spencer<mspencer12...@yahoo.ca>
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Sent: Fri, December 30, 2011 2:13:41 PM
Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.)
On a related note is anyone aware of PC controlled (Ie. RS232 or maybe GPIB ?)
DAC's that would be suitable for this type of application ?
I've also contemplated simply using the DAC of a TBolt but it would seem to be
waste of a Tbolt. I'm thinking along the lines of something that might acquired
used on an auction site.
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--
Chuck Forsberg WA7KGX N2469R c...@omen.com www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
Omen Technology Inc "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
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