On the EEVBlog list, September 2015, Peter Garde (time-nut Australia) wrote the document: Standalone GPSDO Operation of the Lucent KS-24361 REF-0
https://www.eevblog.com/forum/testgear/economical-option-for-precision-frequency-reference/?action=dlattach;attach=172662

It has been five years (2014) since the Lucent GPSDO units, used in the cellular industry, appeared on the surplus market. The REF-0 units are still on the surplus market. Lucent KS-24361, aka HP/Symmetricom Z3812A. https://www.prc68.com/I/KS-24361.html Stewart Cobb & Bob Camp characterized the KS-24361 operation (October 2014) https://time-nuts.febo.narkive.com/Rp1KmwVT/lucent-ks-24361-hp-symmetricom-z3809a-z3810a-z3811a-z3812a-gpsdo-system Dan Watson explored modifications (August 2015) for the REF-0 boxes to operate as a stand-alone GPSDO. Including an updated GPS receiver to emulate the Oncore UT+ timing receiver. https://syncchannel.blogspot.com/2015/08/standalone-operation-of-lucent-ks-24361.html Thomas Petig (Germany) built upon Dan’s work and explored the SCPI commands available on this KS-24361. http://www.petig.eu/ref0/ On the EEVBlog list, September 2015, Peter Garde (time-nut Australia) wrote the document: Standalone GPSDO Operation of the Lucent KS-24361 REF-0 https://www.eevblog.com/forum/testgear/economical-option-for-precision-frequency-reference/?action=dlattach;attach=172662 == Has anyone taken “The Next Step”, replacing the Motorola Oncore 8-channel receiver (VP or UT+) with the Synergy Systems’ SSR-M8 Multi-GNSS Precision Timing Receiver? http://synergy-gps.com/synergy-products/ssr-m8-multi-gnss-precision-timing-receiver/ This receiver features u-Blox LEA-M8 series miniature GNSS timing module (72-channel, SBAS enabled); a Motorola binary message emulation; and User Configurable PPS Output Rate. greg w9gb Sent from iPad Air

On Tue, Sep 17, 2019 at 02:40:46PM -0500, Gregory Beat via time-nuts wrote: > [...] > Dan Watson explored modifications (August 2015) for the REF-0 boxes to operate as a stand-alone GPSDO. Including an updated GPS receiver to emulate the Oncore UT+ timing receiver. > https://syncchannel.blogspot.com/2015/08/standalone-operation-of-lucent-ks-24361.html > > Thomas Petig (Germany) built upon Dan’s work and explored the SCPI commands available on this KS-24361. > http://www.petig.eu/ref0/ Sweden actually. Also build some script to simulate the Oncore GPS with an FTDI USB cable, PPS is send over CTS. This actually worked, the unit was happy. https://github.com/thpe/oncore Aim was to build PCB, with PPS input to accept an external PPS source with optional sawtooth correction/time data converted in case the PPS comes from a ublox: http://petig.eu/schem/lucent-input.pdf I produced the first batch, but there some hardware bugs and I didn't continued further due to lack of time. > [...] /Thomas, SA6CID

Dan mentions the sawtooth correction as part of one of the oncore messages, but wasn't sure if the ref-0 used it. You also mention it in the python script. Did you determine whether it was used in the ref-0 ? On Sat, Sep 21, 2019 at 8:31 PM Thomas Petig <thomas@petig.eu> wrote: > On Tue, Sep 17, 2019 at 02:40:46PM -0500, Gregory Beat via time-nuts wrote: > > [...] > > Dan Watson explored modifications (August 2015) for the REF-0 boxes to > operate as a stand-alone GPSDO. Including an updated GPS receiver to > emulate the Oncore UT+ timing receiver. > > > https://syncchannel.blogspot.com/2015/08/standalone-operation-of-lucent-ks-24361.html > > > > Thomas Petig (Germany) built upon Dan’s work and explored the SCPI > commands available on this KS-24361. > > http://www.petig.eu/ref0/ > > Sweden actually. Also build some script to simulate the Oncore GPS with an > FTDI USB cable, PPS is send over CTS. This actually worked, the unit was > happy. > https://github.com/thpe/oncore > > Aim was to build PCB, with PPS input to accept an external PPS source with > optional sawtooth correction/time data converted in case the PPS comes from > a ublox: > http://petig.eu/schem/lucent-input.pdf > I produced the first batch, but there some hardware bugs and I didn't > continued further due to lack of time. > > > [...] > > /Thomas, SA6CID > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. >