[time-nuts] Thunderbolt? (re simple gpsdo.)

Chuck Forsberg WA7KGX N2469R caf at omen.com
Fri Dec 30 14:46:44 EST 2011

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<mspencer12345 at yahoo.ca>
> To: Discussion of precise time and frequency measurement<time-nuts at 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     caf at 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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