[time-nuts] Z3801 misbehaving

Bob Camp kb8tq at n1k.org
Tue Feb 2 17:34:37 EST 2016


Hi

The only real function of the outer oven on the Z3801 is to improve the 
pereormcane when it fires up cold at -40C. As long as you are at a rational 
temperature, it really does nothing useful stability wise. 

Of course if it pitches an alarm “outer oven dead” that can be a bit of an issue.

Bob

> On Feb 2, 2016, at 8:17 AM, John Green <wpxs472 at gmail.com> wrote:
> 
> Pete, I am now thinking it may be an OCXO outer oven failure. It normally
> runs quite warm. But now, it seems it may be body temperature or maybe a
> little less.  The 10811 is different to a stock one but, is the outer oven
> voltage the same? I would think the inner oven should keep it warm enough
> to achieve lock and hold it. The outer oven is mostly to make the inner
> oven's job easier.
> 
> On Mon, Feb 1, 2016 at 11:23 AM, Pete Lancashire <pete at petelancashire.com>
> wrote:
> 
>> I have a long shot.
>> 
>> If you really do not think it is not anything to do with not getting a
>> signal into the 3801, antenna, cable, connectors etc. I may have a
>> replacement GPS module but will have to be confirmed by the group.
>> 
>> The module is a 8 Channel Motorola Oncore
>> 
>> http://petelancashire.com/gallery/main.php?g2_itemId=5249
>> 
>> I'll send you one if you want to try it out. Only 'cost' I ask is it work
>> let me know.
>> 
>> -pete
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> On Mon, Feb 1, 2016 at 6:52 AM, John Green <wpxs472 at gmail.com> wrote:
>> 
>>> After a couple of days of GPS lock, it went into holdover. I briefly
>>> powered it down and it attained lock again in about 15 minutes. But, a
>>> while later, it was back in holdover. I finally coaxed that Sager laptop
>>> into working and after connecting to it with genuine RS232, I still can't
>>> communicate with it. I get zip with Satstat. And, it isn't locking again
>>> either. So, while it will achieve GPS lock, it doesn't seem to want to
>> stay
>>> locked. And, there is that troubling lack of communication. I am
>>> considering trying a different GPS receiver module. I understand that
>>> probably isn't smart unless I try one similar to the one in it. I
>>> understand that the internal processor talks to the GPS module and
>> anything
>>> with a different command set will cause it to think the GPS has gone bad.
>>> At this point, it looks like my options are limited to buying a new, used
>>> one off eBay for $500, or going to the Thunderbolt, which I don't trust.
>> I
>>> have an old desktop PC I am going to try just in case the laptop RS232
>>> voltages weren't up to snuff. And, I am going to try a different cable,
>>> just in case. It probably wouldn't hurt to exercise the RS232 jumpers
>>> either. Anything else I should try?
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