HP Z3805A Time & Frequency GPS Receiver
© Brooke Clarke 2013 |
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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.
Model
# Chan
I/O
#
Type
Power
10 MHz
Comment
Z3801A
1
RS232 or 422
1
TVB DB-25 pins
Z3805A
2
RS-232
2
2
Z3815A
TVB page
HP E1938A
Milliren 260 OCXOZ3816A
2
58503A 6
1
RS-232
2
1
58503B
no VF or Buttons, just LEDs
Pwr Plug p/n: 1252-5672
58503B-001
1
RS-232
1
1 stock
2 option
VF disp & buttons Fnt Pnl
Alarm Out BNC
59551A
power grid timing module
DC Power
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
output power.
DB-25f Data I/O
Port1: SCPI control
Port2: Time of Day output only
DB-25 RS-232 Pin Out from Wiki
Pin
Function
Pin
Function 1
prot Gnd
14
Txd2
2
TxD1
15
na
3
RxD1
16
RxD2
4
RTS1
17
na
5
CTS1
18
na
6
DSR1
19
RTS2
7
Sig Gnd
20
na
8
DCD1
21
na
9
na
22
RI1
10
na
23
na
11
na
24
na
12
DCD2
25
na
13
CTS2
nc
na
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.
Antenna
The antenna connector is a Type-Nf jack and has +5 Volts on the center conductor, so will work with most amplified GPS antennas.
OCXO
Inside the Double Oven HP 10811 OCXO by Steve Smith - Z3801A -
External Software
http://ulrich-bangert.de/html/downloads.html - Z38XX 2011-10-22
LED blinks once per second.
RS422 & RS232 on PCB near J1.
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.
J18
Coax
10 MHz
J21
6 wires
10811A
J22 Coax EFC P3
4 wires
outer oven
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