This receiver showed up on eBay from seller yixunhk at a very reasonable price and was delivered from Hong Kong in five days. It has dual 10 MHz outputs as well as dual 1 PPS outputs.
Powered from an audio type XLR connector and this particular unit is the BTS Nortel A0696033 option which runs on 19.5 to 30 VDC. Type-Nf antenna connector and a DB-25s data interface.
This unit has a lot of similarity with the Z3801A.
RS232 or 422
TVB DB-25 pins
Milliren 260 OCXO
no VF or Buttons, just LEDs
Pwr Plug p/n: 1252-5672
VF disp & buttons Fnt Pnl
Alarm Out BNC
power grid timing module
See photo above for XLR pin out (Positive on left looking at rear panel, negative on right and chassis ground at the bottom).
10 April 2013 - waiting for the XLR connectors to arrive so it can be powered up.
Just at power up
Trimble GPS antenna in North facing window just behind Z3805A
only Power LED is on.
about an hour later
DC: 24V @ 1.09 Amps
Power & GPS Lock LEDs on
Meanwell RS-35-24 power supply (Jameco) & Power Pole connectors (24V)
Output adjusted to 26.98 V so it can float charge a 24 volt lead acid
gell cell battery if that's the back up method, but also increases the
DB-25f Data I/O
Port1: SCPI control
Port2: Time of Day output only
Converting an HP Z3801A GPS RX to RS-232C I/O by Dave Fifield, AD6
DB-25 RS-232 Pin Out from Wiki
RS-232 Settings 9600 8N1
Software in the Z3805A responds to SCPI which is a universal language that pretty much independent of the brand of equipment, so any SCPI GPS software should work.
The antenna connector is a Type-Nf jack and has +5 Volts on the center conductor, so will work with most amplified GPS antennas.
Inside the Double Oven HP 10811 OCXO by Steve Smith - Z3801A -
External Softwarehttp://ulrich-bangert.de/html/downloads.html - Z38XX 2011-10-22
p/n: 3505A09422 The "A" normally means made in America.
This is a standard HP 10811A with a additional oven. Probably the P3 connector is for the outside oven and the J21 connector is the power for the 10811A.
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page page created 10 April 2013.