[time-nuts] Motorola GPS Z3801A
matthew at matthew.at
Wed Jun 2 03:34:04 UTC 2010
Is the port re-jumpered for RS232 or is it still in the default RS422
(Sent from my iPhone)
On Jun 1, 2010, at 5:45 PM, "Robert Benward" <rbenward at verizon.net>
> 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:
>>> 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.
>> The Oncore interface diagram on Didier's page should be enough to
>> see which pins are which:
>> For the details, here's a link to a nice clean Oncore manual:
>> 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,
>> 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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