[time-nuts] GPDSO is working

[Bob Camp]

Hi

On Jul 11, 2013, at 11:59 PM, Bob Stewart <bob at evoria.net> 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

Time as in minutes, or as in a couple of days? If you look at the plot in the QEX article, a day or so is the expected "warmup" period.

> I see that it's started wandering around +/- a couple of counts from sample to sample (16 seconds). 

If it's + *and* - then the gizmo is driving down the middle of the road. If it's always + or always - then it's likely not yet locked.

> Is this because the UT+ is not set to timing mode? 

The UT needs to be in "position hold" mode with a proper (24 to 48 hour) survey on it's location for best performance. It should not be +/- 100 ns even without this. 

Is your VCXO a 10811? Does it have the same sensitivity as a 10811? If not, you may need (per the article) to make some firmware changes.

Bob

> 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
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