[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
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.
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.
>Stewart Cobb wrote:
>>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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