I got in a Z3812A (aka Lucent KS-24361 REF-0) and installed a Motorola UT+ in
it following the excellent guide by Peter Garde (google is your friend) and
have it working as a standalone GPSDO... basically it now a REF1 unit). The
mod mostly involves moving half a dozen 0 ohm resistors (I chopped out the
resistors... too lazy to unsolder them... and used wire wrap wire to replace
them)) The gps receiver was around $20 from RDR Electronics.
Yes, you could emulate the Motorola receiver with a newer model, but that is a
LOT of work to do correctly for very little benefit (I've never seen a receiver
that offers Motorola emulation get it entirely correct). Or you could use
Dan's GPS message faker hack, but lose the ability to fully control the ref0
via SCPI commands / Lady Heather and would wind up spending the same amount as
adding in the GPS receiver.
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