[time-nuts] Trimble/Nortel GPSTM (NTGS50AA) - working with Lady Heather.

[Sam]

I would be happy to put a GPSTM online via a TCP Serial Port (RFC 2217) to help with the debugging.

Sam


> 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
> > 
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> 
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