Description
Major Components
Cable p/n Z3809A for Z3810AS
Photos
Operation
DC Power
Connection
Software
Related
Links
Background
This is a GPS Disciplined Oscillator (GPSDO) consisting of two units, one that contains the GPS receiver and a redundant slave oscillator that's also disciplined by the single GPS receiver. So the GPS receiver and it's antenna are not redundant, but the rest of the timing solution is making this a much more robust system than a single GSPDO.
RFTG is Lucent speak for Radio Frequency Timing Generator.
Description
Got these from eBay seller aecisouth. They were made by HP/Symetricon for Lucent as the timing source for a cell site.
The Z3810AS is the System designation by HP. The Z3811 is the GPS DO and the Z3812 is the DO. Interface cable is the Z3809A.
The front panels of each unit are the same size 11-1/4" wide x 3" high. The two units when side by side are too wide to fit into a 19" equipment rack.
The interface cable requires the two units to be stacked vertically. In this case both units would fin on a 4U (7.5") high x 19" wide rack panel.
The _____ four captive mounting screws are 2.25" c-c vertically and maybe 10.5" horizontal c-c.
From the top screw on one box to the bottom screw on the other box is about 0.78"
Major Components
Z3810 system Connection order starting with the GPS antenna which feeds the REF 1 GPSDO (Z3811) which feeds the (Z3809A) Cable which feeds the REF 0 DO (Z3812).
DC Power
To power both REF 0 and REF 1 requires a power supply between 18 and 36 Volts. I expect that the current draw goes down as the voltage goes up.
Possible battery packs would be:
5 each 6 Volt AGM batteries: 30 VDC nominal, 34.5 V float charge (This option would provide more voltage and for equal Amp Hr cells, more power)
2 each 12 Volt AGM batteries: 24 VDC nominal, 27.6 V float charge (Based on the front panel label this is probably the one intended)
Here's the current for both the REF 0 and REF 1 wired in parallel to a power supply.
Volts
Amps
Starting
Amps
Running
18
24
30
36
RFTG-u REF 1 GPS Disciplined Oscillator
Markings
Hardware: KS-24361 L102, Lucent-cc: 407672443, Lucent-sn: 00A248402379
Box: Product Number: MR0087598, Serial Number: KR92840232
PCB: Z3811-68001-06-01-9918-08586
Controls & Indicators
P1 DB-9m +24VDC [+24 VDC pin1, Ground pin 2] Power Supply marked "18 to 36 VDC, 1.9A]
J7 TNCf GPS Antenna
J8 DB-9f Diagnostic
J3 DB-9f Alarm
J5 DB-15f Interface
J6 DB-9f RS422/1PPS
J4 SMAf 15 MHz
SW1 17 ro 23 dBm Output Level
LEDs:
No GPS - Flashing: No antenna, No satellite locked, Steady: REF1 GPS locked and tracking
Fault - Something Wrong
Stby - Solid Yellow In holdover mode (have lost satellite lock)
On - Solid Green= Power Applied
RFTG-u REF 0 Pulse Disciplined Oscillator
Markings
Hardware:KS-24361 L101, Lucent-cc: 407672435, Lucent-sn: 00A248302153
Box: Product Number: MR0087330, Serial Number: KR92830142
PCB: Z3812-68001-06-01-9925-04206
Controls & Indicators
P1 DB-9m +24VDC [+24 VDC pin1, Ground pin 2] Power Supply marked "18 to 36 VDC, 1.9A]
J1 SMAf 10 MHz TP
J8 DB-9f Diagnostic
J3 DB-9f Alarm
J5 DB-15f Interface
J6 DB-9f RS422/1PPS
J4 SMAf 15 MHz
SW1 17 ro 23 dBm Output Level
LEDs:
No GPS - Flashing: No antenna, No satellite locked, Steady: REF1 GPS locked and tracking
Fault - Something Wrong
Stby - Solid Yellow In holdover mode (have lost satellite lock)
On - Solid Green= Power AppliedCable p/n Z3809A for Z3810AS
Hardware cable markings: Z3809-60201-2, SP 1199, Made In USA, Lucent-CC, 407951482
Hardware molded connector marking: hp
DB-15m to DB-15m.
Note: the J5 Interface connector is the only one on both front panels that has the mating DB-15f connector so there's no way to install it in the wrong place.
The cable is symmetrical end to end so it doesn't matter which end goes to which box.
REF0
REF1
REF1
1
15
9600 baud
2
14
0.1V
3*
13*
presence detect (open-> alarm
4
12
4.8V (logic?)
5
11
1PPS: 5V-800ms, low-200ms
6
10
17/23 sig from REF0
71
9
4.V (logic?)
8*
8*
Chassis Ground
9
7
0.1V (logic?)
10
6
17/23 output signal
11
5
1PPS: low-400us, 5V-999.6ms
12
4
0.1V (logic?)
13*
3*
Chassis Ground
14
2
Logic low?
15
1
5V logic?
Shield
Shield shield and connector shells
Note 1: It may be that opening REF0-7 will allow both REF0 and REF1 to display the green status LEDs.
Pins 3, 8 & 13 on each end of the cable are shorter than the other pins. This is typically done to support hot swapping. In this case ground is connected after the signal connections. That way it doesn't matter which ground connects.
Photos
Fig 1 Box marked Symmetricon
Fig 2 Contents: 2 boxes and cable
Fig 3 RFTG-u REF 1
Fig 4 RFTG-u REF 0
Fig 7 RFTG-u REF 1
Fig 6 RFTG-u REF 0
Fig 8 RS-422 Pinout
Fig 9 Major Components (3)
Operation
DC Power
Connection
Connection order starting with the GPS antenna which feeds the REF 1 GPSDO which feeds the Cable which feeds the REF 0 DO.
Software
Related
Disciplined Oscillator Patents
HP E1938 Ovenized Crystal Oscillator
HP Z3805A Time & Frequency GPS Receiver GPSDO
Trimble ThunderBolt Timing GPS Receiver GPSDO
CSI LGBX Pro DGPS Receiver
FEI Frequency Standards
Navigation
GPS antennas at DAGR and Trimpack
PSN-8 VSN-8 GPS receiver
PSN-9 GPS receiver
PSN-10 SLGR GPS receiver (Trimpack)
PSN-11 PLGR GPS receiver
PSN-13 DAGR GPS receiver
PLGR GPS receivers
PLGR-II Rockwell HNV-2000 PLGR II SPGR GPS Receiver
DAGR GPS receivers
HNV-600 Rockwell Trooper
HNV-2000 Rockwell PLGR II SPGR GPS Receiver
Magellan GPS Commander
Magnavox MX7221 GPS Receiver
Trimpack & other Trimble GPS receivers
Thunderbolt Trimble timing GPS receiver
Ashtech Z12 GPS Receiver
Stanford Telecom 5001A Single Satellite GPS Signal Generator
Northern Telecon GPS Satellite Simulator STR2760
Precision GPS Measurements From: "Dr Thomas A Clark (W3IWI)"
4-Way GPS Signal Splitter using Cable TV Parts
GPS & Satellite Navigation Patents
Motorola GPS Receivers
MX 4102 Transit Satellite Navigator & MX 4200 Differential GPS receiver
Quantic Q-5200/SM Timing GPS Receiver
URN-502 Vehicle Mount GPS Receiver System
Links
eBay seller (Oct 2014) aecisouth
http://www.realhamradio.com/gps-satstat-software.htm
Description: https://www.febo.com/pipermail/time-nuts/2014-October/087274.html & Time Nuts Mailing List: https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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page page created 31 Oct 2014.