beautiful. we should create a compendium: '101 uses for a dead cesium'
On Mon, Apr 20, 2020 at 9:50 PM Skip Withrow <skip.with...@gmail.com> wrote: > Hello Time-Nuts, > Well, with the COVID-19 stay at home order I have been working on a > couple of projects (at home). > > This post shows what I have done with an old FEI FE-5440A cesium > standard. The tube was dead, so I decided to turn it into a GPSDO. I > ripped out the tube, HV supplies, modulator, and OCXO. The battery > was already missing, so it was replaced with a couple of SLA units. I > decided to use a TruePosition GPSDO since it was small (I just wish it > had a LOCK indicator). An SMA antenna connector was added to the rear > panel. > > Basically, the 10MHz from the GPSDO feeds the distribution system in > the FE-5440A. The TruePosition 1pps was brought out to the front > panel, and can be used to synchronize the clock in the unit. An > RS-232 DB-9 was put in place of the C-field control so Lady Heather > can monitor. > > Some of the nice features are: > 10MHz, 1Mhz, 100kHz, 1pps, and 1ppm front panel BNC outputs. > Front panel clock display (that is easily set from the front panel) > 1pps (FE-5440A) can be offset from 0-1 sec in 100ns steps from the > TruePosition 1pps > Battery backup (greater than 2 hours) and DC input, as well as AC input > > I don't know about the phase noise performance, but ADEV is probably > better than the original standard (as long as there is a GPS antenna > connected). > > I have attached a couple of pictures of the unit plus a 5-day TimeLab plot. > > Regards, > Skip Withrow > _______________________________________________ > 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. > -- Dave Mallery, K5EN (ubuntu linux 19-04) 80018 Lobo CP Grants, NM 87020 linux counter #64628 (since 1997) _______________________________________________ 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.