Matt,
It's been modified. I was told that when I bought it, and confirmed it myself. I don't get the right voltages; I need
a new RS-232 interface chip.
Bob
----- Original Message -----
From: "Matthew Kaufman" <[email protected]>
To: "Discussion of precise time and frequency measurement" <[email protected]>
Cc: "Discussion of precise time and frequency measurement" <[email protected]>
Sent: Tuesday, June 01, 2010 11:34 PM
Subject: Re: [time-nuts] Motorola GPS Z3801A
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" <[email protected]> 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" <[email protected]>
To: "Discussion of precise time and frequency measurement" <[email protected]
>
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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