Oscilloquartz Model 3210 Cesium Frequency Standard -------------------------------------------------- This unit is from a lot of three bought around 2014, each part of a Racal Portable Frequency Standard in a short rack with backup battery power supppy. One had faults that I was unable to fix, no preamp or harmonics, suspect tube failure, and went to a collector in Japan for spares. The other two worked fine. They are an all analog unit, with no processor or other complications and assuming that the vcxo is warmed up, will go into lock within 5-15 minutes from start of cesium oven switch on. Once locked, preamp and harmonic levels are slightly offscale initially, but settle down over about 24 hours to a stable state, as the unit warms up. Suspect these are low hours because of fast lock, high tube signal levels and the fact that these were only designed for temporary use, taken to sites for calibration of other equipment. Good cosmetic condition, though the internal nicad packs were dead and have been removed. Line or 20-30 volts DC power via rear connectors. Outputs are 1, 5 and 10MHz sine via front and rear panel bnc connectors. Both have the digital led clock option fitted with leap second, cfield and delay correction settings. The two standards show unmeasureable phase drift against each other. Very low drift against a gps do, which appears to step up to few degrees per minute, very slowly and thus likely to be a measure of the gps do uncertainty itself. Use an HP8405A vector voltmeter for that sort of visual test. Looking to dispose of one of the two and had thought of Ebay, but this list might might be a better start. Looking for 2450 ukp or close, but am really looking to swap for an HP 3458 8.5 digit voltmeter in good working order. Have the volt nuts disease as well and am working on some ideas for low cost voltage references. Location Oxford England and can build a padded wooden case and ship worldwide if needed, at buyer's risk. Better to be collected though, as it is a bulky (about 28kg) and fragile item and better that it can be shown working. Full manual and schematics supplied, courtesy of a user here on time nuts when I first aquired the standards... Regards, Chris _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com