My 58503 GPS time/frequency reference had its power disconnected a few times yesterday as I moved things in the lab. At the modem the status of the LEDs are
* Power green * GPS lock - not lit * Holdover - not lit * Alarm - not lit. That is what the manual says will happen when power is first applied, but I'm puzzled why. The SYSTEM:STATUS? shows the information at the end of this email. What I can't understand is why the holdover light is not lit, when clearly its not tracking any satellites. It seems logical to me that holdover should be on, when GPS lock is not, and visa versa. But that does not seem to be the case. Looking at the data below, the date/time is obviously wrong (01 Jan 1998), the height at -14.04 m (MSL) is wrong, but latitude and longitude look about right, although they are certainly not exactly agreeing with Google maps, which show 51°39'04.1"N+0°46'36.4"E. I must be misunderstanding the purpose of these lights. I'm also a bit puzzled it has been on about 1.5 hours, and can't seem to find a single satellite. The antenna is fairly clear of anything else, and it was certainly working yesterday, with the power and GPS lock LEDs both lit. Any ideas what's going on? scpi > SYSTEM:STATUS? ------------------------------- Receiver Status ------------------------------- SYNCHRONIZATION ........................................... [ Outputs Invalid ] SmartClock Mode ___________________________ Reference Outputs _______________ Locked TFOM 9 FFOM 3 Recovery 1PPS TI -- Holdover HOLD THR 1.000 us >> Power-up: GPS acquisition Holdover Uncertainty ____________ Predict -- ACQUISITION .............................................. [ GPS 1PPS Invalid ] Tracking: 0 ____ Not Tracking: 1 ________ Time _____ +1 leap second pending PRN El Az UTC 12:59:16 [?] 01 Jan 1998 *32 -- --- GPS 1PPS Invalid: not tracking ANT DLY 0 ns Position ________________________ MODE Survey: 0% complete Suspended: track <4 sats INIT LAT N 51:39:03.825 INIT LON E 0:46:36.278 ELEV MASK 10 deg *attempting to track INIT HGT -14.04 m (MSL) HEALTH MONITOR ......................................................... [ OK ] Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK scpi > Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. http://www.kirkbymicrowave.co.uk/ Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please) _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.