[time-nuts] Ashtech Z-12 firmware?

bg bg at lysator.liu.se
Sat Aug 27 01:44:48 EDT 2016

Hi Gregory,
For a long time ftp://ftp.ashtech.com was useful.

Sent from my smartphone.
-------- Original message --------From: Gregory Maxwell <gmaxwell at gmail.com> Date: 27/08/2016  01:34  (GMT+01:00) To: Discussion of precise time and frequency measurement <time-nuts at febo.com> Subject: [time-nuts] Ashtech Z-12 firmware? 
I recently picked up a couple non-functional Ashtech Z-12 receivers
with the external frequency input (these appear to PLL an internal
TCXO; I understand there are other models where they replace the TCXO

I was hoping to use them both better data sources for common view time
transfer with better performance than the GPS L1/CA  that I've been
using; as well as using them for ground truth data for a SDR
semi-codeless CRPA receiver I'm slowly building.

These units were hanging at startup at "Downloading channel". I
determined that they would work a single time if the memory were
cleared (by holding an arrow, right for external up for internal,
during start). Because the internal 3.6v primary cell batteries were
reading about 40mv I took a guess that the low battery was causing
memory corruption across restarts.

New batteries and a bit of soldering later, and they are working
reliably across restarts, locking sats on L1/L2, talking on RS232,
etc. (hurrah).  Hopefully this message in the archives is useful if
someone else encounters similar symptoms.

Before I go further I was wondering if anyone knew of a source for
firmware for these old units?  One of mine is marked "Z-12 700751-6
(b)", unfortunately it seems ashtech has been sold many times, and the
old web/ftp sites have been scattered to the wind.

The nearest I was able to find was this page
 with micro-Z firmware.

[If there is a relevant GNSS nuts list, I'd be glad to hear about it--
my interest is in CVTT but perhaps somewhere else there is a den of
people obsessed with old survey hardware that would prefer these
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