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

Glen Hoag hoag at hiwaay.net
Mon Oct 20 12:04:51 EDT 2014

The seller is offering the REF-0 and REF-1 units at $75 each plus 
shipping.  When I searched for "Lucent KS-24361", I found the 
original item with both, as well as the individual units.

--Glen Hoag
   hoag at hiwaay.net

At 10:22 AM 10/20/2014, you wrote:
>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 
>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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