[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system

Anthony Roby aroby at antamy.com
Mon Oct 20 12:38:30 EDT 2014

In the link below there's a photo of one of the units with a ruler against it - 11" wide.


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] 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

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.

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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