Arghhhh! I read the whole article on the mod but just didn't see the ruler.
Oops!
Thanks for the alert,
Dave M
Anthony Roby wrote:
In the link below there's a photo of one of the units with a ruler
against it - 11" wide.
Anthony
-----Original Message-----
From: time-nuts [mailto:[email protected]] On Behalf Of Dave
M
Sent: Monday, October 20, 2014 10:22 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A,
Z3810A, Z3811A, Z3812A GPSDO system
Stu,
Many thanks for the heads-up on htese units. Great deals.
Can you advise the size of these units? Are they full-size 19" rack
mount or the half-size units like the Z3801A?
Can the REF-1 unit (the one with the GPS receiver) be operated
separately from the REF-0 unit?
There is a mod on Didier's site to add the 10 MHz output to the RFTGm
unit at
http://www.ko4bb.com/manuals/download.php?file=05)_GPS_Timing/Lucent_RFTGm_RFTGm-II-XO_GPSDO_modification_to_add_10MHz.pdf.
I don't know if the mod will apply to the units on Ebay right now,
but it's quite possible that it does.
Cheers,
Dave M
Stewart Cobb wrote:
Fellow time-nuts,
This (long) post is a review of the HP/Symmetricom Z3810A (or
Z3810AS) GPSDO system built for Lucent circa 2000. I wrote it
because I looked for more information before I bought one, and
couldn't find much. It's relevant because (as of this writing), you
can buy a full system on the usual auction site for about $150 plus
shipping. For those of you lamenting the dearth of cheap
Thunderbolts, this looks like one of the best deals going. The
description of these objects does not include "GPSDO", so time-nuts
may have missed it. Search for one of the part numbers in the
subject line and you should find it.
So what is it? It's a dual GPSDO built by HP as a reference
(Redundant Frequency and Time Generator, or RFTG) for a Lucent
cell-phone base station, built to Lucent's spec KS-24361. Internally,
it's a close cousin of a later-model Z3805A. Externally, it looks to
be almost a drop-in replacement for the earlier RFTG system built to
Lucent's spec KS-24019. That was a redundant system containing one
rubidium (LPRO, in the one I have) and one OCXO in two
almost-identical boxes. That spec went through several revisions
with slightly different nameplates and presumably slightly different
internals. You can generally find one or two examples on the auction
site (search for RFTG or KS-24019).
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