[time-nuts] Motorola GPS Z3801A

Robert Benward rbenward at verizon.net
Wed Jun 2 00:45:54 UTC 2010

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,

----- 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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