[time-nuts] Motorola GPS Z3801A

Matthew Kaufman matthew at matthew.at
Tue Jun 1 23:34:04 EDT 2010


Is the port re-jumpered for RS232 or is it still in the default RS422  
mode perhaps?

Matthew Kaufman

(Sent from my iPhone)

On Jun 1, 2010, at 5:45 PM, "Robert Benward" <rbenward at verizon.net>  
wrote:

> Hi Rex,
> This well help a great deal.  If you read some of my earlier posts,  
> I'm stuck with a Z3801A that I bought at the Dayton Hamfest, which  
> unfortunately, doesn't work.  I'm hoping it's only the RS-232 port,  
> but after 24 hours, only the holdover light is on.  So now I either  
> have two bad antennas, or a bad Z3801A (beyond the RS-232).
>
> Thanks again,
> Bob
>
>
> ----- Original Message ----- From: "Rex" <rexa at sonic.net>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com 
> >
> Sent: Tuesday, June 01, 2010 8:28 PM
> Subject: Re: [time-nuts] Motorola GPS Z3801A
>
>
>> Robert Benward wrote:
>>> Hi,
>>> Does anyone have the pinouts for the Motorola GPS within the  
>>> Z3801A?  It's a ten pin header and I would like to intercept the  
>>> data stream to see if it's working.  Also, I read about some of  
>>> the Motorolas putting out binary data, not NEMA protocol.
>>>
>>> Thanks,
>>> Bob
>>>
>> The Oncore interface diagram on Didier's page should be enough to  
>> see which pins are which:
>> http://www.ko4bb.com/cgi-bin/manuals.pl?dir=05%29_GPS_Timing
>>
>> For the details, here's a link to a nice clean Oncore manual:
>> http://gpsd.berlios.de/vendor-docs/motorola/
>>
>> Chapter 6 of that manual is a description of the Oncore commands  
>> that are used by these receivers. Yes, it is a mixture of ASCII  
>> commands with binary data.
>>
>> I forget which receiver(s) the Z3801A used. My Z3816a has a UT+ but  
>> it is a little more recent than the 3801's. Someone here, no doubt,  
>> remembers.
>>
>> A few years back there were a bunch of posts to this list with  
>> reference documents for the various Oncores that HP or Symmetricom  
>> used in the timing receivers. Lots of detail of firmware versions  
>> and differences between the Oncore receivers. I don't have a link  
>> now. Maybe others do.
>>
>>
>>
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>
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