[time-nuts] GPDSO is working

Chris Albertson albertson.chris at gmail.com
Sat Jul 13 00:27:55 UTC 2013


I have a UT+  I bought a TTL-RS232 converter on eBay the converter is built
into a DB-9 socket.   It uses male header pins for conniption, the same
kind of pins as on the UT+
Look at item # 330838910970 on eBay.  It is almost exactly what I have,
lots of people sell them.   It is just the max232 chip but the packaging
looks clean and easy to use.

But as I remember I had to use at least one inverter gate.  I forgot why
maybe to drive the PPS or the LED I wanted to add.

I don't have a VE2ZAZ board.  I was using the UT+ for NTP server.   My next
project is to build a GPSDRO (GPS Disciplined Rubidium Oscillator)   I
could likely count the 10MHz output for 10,000 seconds.


On Fri, Jul 12, 2013 at 10:04 AM, Bob Stewart <bob at evoria.net> wrote:

> Hi Chris,
>
> Thanks.  Our setup is a bit different.  My oscillator is the Trimble
> 34310-T and I'm using an Oncore UT+ receiver board.  What are you using for
> your RS-232-TTL converter?  I'm looking for one that will look relatively
> "clean" when I get it mounted on the back of this HP 37203A box..  I'm also
> interested in the idea of using a USB-TTL converter, but I haven't seen a
> decent one with the square(ish) socket, rather than the rectangular one.
>
>
> Bob - AE6RV
>
>
>
> >________________________________
> > From: Chris Howard <chris at elfpen.com>
> >To: Bob Stewart <bob at evoria.net>; Discussion of precise time and
> frequency measurement <time-nuts at febo.com>
> >Sent: Friday, July 12, 2013 11:32 AM
> >Subject: Re: [time-nuts] GPDSO is working
> >
> >
> >
> >
> >Hi Bob.
> >
> >My configuration is:
> >
> >    - HP 10811-60111 10 Mhz oscillator
> >    - Trimble Resolution-T GPS card
> >    - VE2ZAZ controller board
> >    - homebrew power supplies
> >    - RS232 switchable between GPS and VE2ZAZ controller
> >    - little e-bay puck GPS antenna on the top of an 8' post outside my
> window.
> >
> >I did get the software for the Resolution-T from the Trimble
> >site and did a site survey.
> >
> >My software settings for the VE2ZAZ controller board are:
> >
> >S: 00E1  (a few seconds more than one hour)
> >F: 01    (for this osc the fine adj is not useful)
> >L: B1
> >H: 10
> >W: c8
> >N: 0A
> >O: 01
> >X: 02
> >M: 01
> >
> >I've had the thing running for about a year.
> >It took a while to figure out a bad solder joint in
> >my oscillator that made the DAC voltage ineffective.
> >Since it's been running right I have had the opportunity
> >to compare it to a cesium standard and I'm happy.
> >
> >There is also a mailing list for the VE2ZAZ controller
> >where you might find more info:
> >
> >http://mailman.qth.net/mailman/listinfo/gps_standard
> >
> >Chris
> >w0ep
> >
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-- 

Chris Albertson
Redondo Beach, California



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