Hi Gee, now if we just could talk *someone* into adding a feature to Lady Heather :)….
Bob On Apr 15, 2012, at 8:23 PM, Sam wrote: > There was some discussion in Dec 2011 regarding the Trimble/Nortel GPSTM > (NTGS50AA) which fizzed out after it was mentioned that Lady Heather would > not work with these units. I was undeterred and purchased some anyway. > > I have started playing around with these and have discovered that by asking > it Sat status (0x10, 0x3C, 0x10, 0x03) at ~300ms intervals the unit will > start streaming data after a few seconds. Once the Trimble is in this state > Lady Heather detects the GPSDO and seems to work normally... Except the TC > and DAMP fields which are reported as 0.0 and GAIN which is reported as > -3.500 Hz/V (Tboltmon reports the correct values) I have read that this also > happens with older Thunderbolts? > > I have written a small Windows app (available on request, off list) that > sends the required packets to the GPSTM and by wrapping it in a batch file I > have it opening Lady Heather once the unit is in the required state. (Only > required once, or after running Tboltmon) > > > Details of my 3, Trimble NTGS50AA's are: > > Firmware: > App: 2.68 - 16 Dec 2004 > GPS: 10.4 - 15 Dec 2004 > > GPS receiver has 8 Channels. > > Default disciplining parameters as reported by Tboltmon: > Time Constant (sec): 100.0 > Damping: 1.2 > Ko (Hz/V) 1.20 > Min Voltage: 0.0 > Max Voltage: 6.0 > Initial DAC Voltage: 3.000000 > Jam Sync Thresh (ns): 0.0 > Max Freq Offset (ppb): 45.0 > > These GPSDO's uses the Trimble 34310 DOCXO which I think is the Vectron > OC-050? > > There are 4 SMB RF connectors on the main board: > 1. GPS Antenna Input > 2. 10.000 MHz Output > 3. 9.834 MHz Output > 4. 0.5 Hz (Even Sec) PP2S Output. Unfortunately requesting the unit to > output 1PPS does nothing. (yet) > > The 9.8304MHz output may be handy.. divided by 300 it's 32.768 KHz ;) > > Power Supply: > The NTGS50AA requires 36-75 VDC (48V nominal) and has a on-board Lucent DC-DC > converter to supply the required +/-12 and +5 volts. > > Serial Interfaces: > Port A is RS-422 @19200 SCPI (available on the 110 pin connector on the main > board) > Port B is RS-232 @9600 TSIP (DB9 connector on Breakout board) > > LED indicators: > There are 5 LED's on the breakout board that contains the DB9 connector. > 1. Power > 2. Not used, but switch-able via software > 3. Not used, but switch-able via software > 4. Lock > 5. Holdover > > Temperature Sensor: > DS1620 Rev D > > Jumpers: > There is a 8 pin header (JP1) on the main board that would accept 4 jumpers.. > I haven't tried them but it is tempting to see what happens when I enable > them. > > > //Sam > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
