[time-nuts] GPDSO is working

[Brian Alsop]

Max 232's invert the polarity.  You have to follow with an inverting 
gate if the TTL stuff worked.

Brian

On 7/13/2013 00:27, Chris Albertson wrote:
> 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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>
>
>



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