HP Z3805A Time & Frequency GPS Receiver

Brooke Clarke 2013
HP Z3805A Time
                  & Frequency GPS Receiver
HP Z3805A Time
                  & Frequency GPS Receiver
HP
                  Z3805A Time & Frequency GPS Receiver Top Inside



Background
Other HP GPS receivers
Operation
    DC
    DB-25
    Antenna
    OCXO
    External Software
Back Panel
OCXO
Related
Links

Background

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.

Other HP GPS receivers


Model
# Chan
I/O
#
Type
Power
#
10 MHz
#
1 PPS
Comment
Z3801A


1
RS232 or 422

1

TVB DB-25 pins
Z3805A

2
RS-232

2
2

Z3815A
TVB page





HP E1938A
Milliren 260 OCXO
Z3816A


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



Operation

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.

HP Z3805A Just after power up
HP Z3805A about an hour after power 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.
HP Z3805A Time
                    & Frequency GPS Receiver & Meanwell RS-35-24
                    power supply


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
Before Top
HP Z3805A
                          Time & Frequency GPS Receiver
Before Bottom
HP Z3805A Time & Frequency GPS
                            Receiver



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

Back Panel

HP Z3805A Time & Frequency GPS Receiver HP
                  Z3805A Time & Frequency GPS Receiver
HP
                  Z3805A Time & Frequency GPS Receiver

LED blinks once per second.
RS422 & RS232 on PCB near J1.


OCXO

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.

HP
                  Z3805A Time & Frequency GPS Receiver



J18
Coax
10 MHz
J21
6 wires
10811A
J22 Coax EFC
P3
4 wires
outer oven






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Links


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