j...@luxfamily.com said:
> These days, since PCs don't have serial ports, you can buy a RS422 USB
> adapter for $5. If I were doing it now, I wouldn't bother reconfiguring.
USB is ugly for timing. I can get RS-232 PCI cards cheap enough.
Has anybody found a good RS-422 card? The ones I
Some information on the Motorola Oncore VP used in the HP Z3801A
http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Motorola_Oncore/Oncore_Interface_Brian_Kirby.pdf
http://www.realhamradio.com/tac32-interface.htm
http://www.realhamradio.com/GPS_Frequency_Standard.htm
On 2/24/22 7:25 PM, ed breya wrote:
Paul and Hal, I think there may be some confusion here. I modified the
Z3801A to RS-232 way back when I first got it. My recent post was just
discussing some of what's in this demo/testing unit thing. It's just a
translator for TTL/RS-232 for when the GPS RX
Paul and Hal, I think there may be some confusion here. I modified the
Z3801A to RS-232 way back when I first got it. My recent post was just
discussing some of what's in this demo/testing unit thing. It's just a
translator for TTL/RS-232 for when the GPS RX board (TTL serial) is used
by
paulsw...@gmail.com said:
> Internally there was a mod that allowed the 3801 to output true rs 232.
> Numbers of jumpers as I recall. Like 8 or 10.
Jeff Mock wrote up a nice description of how to do it, with good pictures.
https://support.ntp.org/bin/view/Support/Z3801AReceiverModifications
Hi Ed
I have used satstat also but favor ladyheather. So nice.
Internally there was a mod that allowed the 3801 to output true rs 232.
Numbers of jumpers as I recall. Like 8 or 10.
If your using satstat then it doesn't remember anything.
As suggested in the points if the almanac is gone it can
Paul,I'm using the old HP SatStat program. It's plenty good enough for
my simple needs. I also found I have a bunch of old stuff from over ten
years ago, while organizing the older PCs and consolidating backup
files. The original Motorola WinOncore program is included. This can
talk to the RXs
time-nuts Digest, Vol 214, Issue 24
On Mon, 21 Feb 2022 22:39:10 -0500, time-nuts-requ...@lists.febo.com
wrote:
> Message: 7
> Date: Tue, 22 Feb 2022 01:30:38 +0100
> From: Magnus Danielson
> Subject: [time-nuts] Re: Types of noise (was: Phase Station 53100A
> Questions)
> To:
Ed what tool are you using to monitor the 3801.
LadyHeather remembers these bits of good stuff.
Regards
Paul.
WB8TSL
On Thu, Feb 24, 2022 at 2:46 PM ed breya wrote:
> Last night I told it to do a survey, and let it slog through it
> overnight. This morning it seemed to be working fine, and
Aha, thanks John. I just saw your message after sending my previous reply.
That would explain a couple of things - first, that the TCXO needs a
workout, and may have been the entire cause all along, and second, that
those Flash parts (or is it something else?) are used for storing data
during
Last night I told it to do a survey, and let it slog through it
overnight. This morning it seemed to be working fine, and apparently in
position hold mode.
Then I shut it down for about 45 min to let things cool down to nearly a
fresh cold-start condition. On power up, it went through the
I recently fired up my old Z3801As and ran across a similar problem.
Art Sepin helpfully reminded me that the old Motorola receivers'
on-board oscillators drift with time and after a long power off the
oscillator may drift so far that it can't lock. The receiver stores
calibration data in
Hi
If the unit has been off long enough ( could be decades ….. ) there is a lot
about the GPS system that it really has no way of knowing. It will have to
grab a full almanac and the ephemeris data from whatever it might happen
to be able to download it from. Since the data rate on GPS is mind
Ed these older units do indeed take hours to potentially sync. Powerup and
let go for 24 hours if its been off a long time. Normally doesn't take
anything like 24 hours. But if that much time goes by thats a really bad
indicator.
I actually add in the battery backup to the gps receivers. 2 X AA
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