The model number is that of an Oncore VP. It is easy to remove the receiver from the unit for testing independently. That might be worth a try. Maybe reseating it may help if there is any continuity problem on the pins. Unfortunately you will probably need another VP to replace a dead one. IIRC, I did try to replace a VP in my Z3801A with a UT+ , but it would not work.
"Ceux qui sont prêts à abandonner une liberté essentielle pour obtenir une petite et provisoire sécurité, ne méritent ni liberté ni sécurité." Benjimin Franklin > Le 13 févr. 2015 à 20:28, John Stone <jo...@ks.uiuc.edu> a écrit : > > Hi, > I've got a Z3805A that I bought off ebay a couple of > years ago, and it recently started going deaf, beginning > with an apparent loss of sensitivity leading to holdovers, > and more recently, receiver errors reported in the system > status. > > I have the Z3805A, a thunderbolt, and one of the recently discussed > KS-24361 units sharing the same GPS antenna via a four output > 58536A distribution box. I've run the Z3805A on its own > separate antenna and compared its signal levels with the > other units, and it has clearly developed some issue. > After a power cycle, I can get it going by initiating a > survey, but after a day or two of running it will lose > all sats, and in some cases the status command will show > "GPS Rcv: Err". > > I queried the hardware info on the GPS in this unit and > from what I've gathered, it's one of the earliest motorola > Oncore GPS receivers based on the "B1121P1114" model number. > What GPS module models can I put into a Z3805A to get it > running again? Any tips are appreciated, including suggestions > for tests I could run on the GPS module, the power supply, or > other items that might be common failure points. > > I've included the output from scpi queries below, and the > status from the KS-24361 attached to the same antenna > for comparison: > > *IDN? > HEWLETT-PACKARD,Z3805A,3542A00943,3543B-A > > :DIAG:LIF:COUN? > +29437 > > :DIAG:IDEN:GPS? > "COPYRIGHT 1991-1995 MOTOROLA INC.", > "SFTW P/N # 98-P39972M ", > "SOFTWARE VER # 8 ", > "SOFTWARE REV # 4 ", > "SOFTWARE DATE 13 JUL 1995", > "MODEL # B1121P1114 ", > "HDWR P/N # _ ", > "SERIAL # SSG0120281 ", > "MANUFACTUR DATE 5M18 ", > "OPTIONS LIST IB " > > > Failing Z3805A system status output: > ------------------------------- Receiver Status > ------------------------------- > > SYNCHRONIZATION ........................................... [ Outputs Invalid > ] > SmartClock Mode ___________________________ Reference Outputs > _______________ > Locked to TFOM 9 FFOM 3 > Recovery 1PPS TI -- > Holdover HOLD THR 1.000 us >>> Power-up: GPS acquisition Holdover Uncertainty ____________ > Predict -- > > ACQUISITION .......................................... [ GPS 1PPS CLK Invalid > ] > Satellite Status __________________________ Time > ____________________________ > Tracking: 0 Not Tracking: 0 GPS 08:51:14 [?] 12 Feb > 2015 > 1PPS CLK Absent or freq error > ANT DLY 180 ns > Position ________________________ > MODE Survey: 0% complete > Suspended: no track data > INIT LAT N 40:08:01.714 > INIT LON W 88:12:27.166 > ELEV MASK 10 deg INIT HGT +198.59 m > (MSL) > HEALTH MONITOR ...................................................... [ ERROR > ] > Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: > Err > scpi > > > > For comparison, here is what my recently acquired Z381x / KS-24361 GPSDO > says, driven from the same antenna: > > -------------------------- Secondary Receiver Status > -------------------------- > SYNCHRONIZATION ............................................. [ Outputs Valid > ] > SmartClock Mode ___________________________ Reference Outputs > _______________ >>> Locked to GPS TFOM 3 FFOM 0 > Recovery 1PPS TI +10.0 ns relative to GPS > Holdover HOLD THR 1.000 us > Power-up Holdover Uncertainty ____________ > Predict 3.7 us/initial 24 hrs > > ACQUISITION ................................................ [ GPS 1PPS Valid > ] > Tracking: 8 ____ Not Tracking: 2 ________ Time _____ +1 leap second > pending > PRN El Az C/N PRN El Az GPS 19:22:10 13 Feb > 2015 > 1 23 302 37 11 15 278 GPS 1PPS Synchronized to GPS Time > 4 32 269 43 18 18 138 ANT DLY 60 ns > 12 20 49 38 Position ________________________ > 14 66 30 46 MODE Hold > 22 53 146 39 > 25 36 90 38 LAT N 40:08:00.925 > 31 61 216 42 LON W 88:12:26.995 > 32 43 310 46 HGT +200.94 m (GPS) > ELEV MASK 10 deg > HEALTH MONITOR ......................................................... [ OK > ] > Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: > OK > > > Cheers, > John Stone > > -- > NIH Center for Macromolecular Modeling and Bioinformatics > Beckman Institute for Advanced Science and Technology > University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801 > http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349 > http://www.ks.uiuc.edu/Research/vmd/ > _______________________________________________ > 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. _______________________________________________ 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.