[time-nuts] GPDSO is working

Chris Howard chris at elfpen.com
Fri Jul 12 12:32:00 EDT 2013



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





On 7/12/2013 10:32 AM, Bob Stewart wrote:
> Hi Chris,
> 
> Thanks for the feedback.  Do you happen to know the parameters you have setup for yours?  Just wondering what you are using for the "F", "M", and "S" parameters.  What kind of receiver are you driving yours with, and do you have it in "position hold" mode?
> 
> 
> Bob
> 
> 
> 
> 
>> ________________________________
>> From: Chris Howard <chris at elfpen.com>
>> To: Bob Stewart <bob at evoria.net> 
>> Sent: Friday, July 12, 2013 6:45 AM
>> Subject: Re: [time-nuts] GPDSO is working
>>
>>
>> On 7/11/2013 10:59 PM, Bob Stewart wrote:
>>> After ham-fistedly breaking a few things, I've finally got my GPSDO working. (does happy dance)  Now that it's had some time to warm up I see that it's started wandering around +/- a couple of counts from sample to sample (16 seconds).  Is this because the UT+ is not set to timing mode?  Putting in an RS-232 (or USB) to TTL adapter, switchable between the UT+ and the VE2ZAZ board, is pretty much next on my schedule.  I've got an adapter I made many years ago, but it's not suitable for mounting in the box, and there's no simple way to hook it up to the UT+ at the moment.
>>>
>>> Bob
>>
>> I think I recall you are using the VE2ZAZ board.
>>
>> Yes, the count each time goes up and down.
>> I am using  that board
>> and mine goes up and down, roughly in the
>> +/- 5 range.
>>
>>
>> Chris
>> w0ep
>>
>>
>>
>>
>>
>>
>>
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