Hp z3801 software

Post by Pete Lancashire I have a long shot. If you really do not think it is not anything to do with not getting a signal into the , antenna, cable, connectors etc.

I may have a replacement GPS module but will have to be confirmed by the group. Only 'cost' I ask is it work let me know. So, while it will achieve GPS lock, it doesn't seem to want to. Post by John Green locked. I understand that the internal processor talks to the GPS module and. It normally runs quite warm. But now, it seems it may be body temperature or maybe a little less. The is different to a stock one but, is the outer oven voltage the same?

I would think the inner oven should keep it warm enough to achieve lock and hold it. The outer oven is mostly to make the inner oven's job easier. It normally Post by John Green runs quite warm. A novice to the GPS community why are apparently only the Trimble units affected? Artek Manuals UTC. Bob Camp UTC. Azelio Boriani UTC. I use it to drive a Tektronix A time mark generator that makes handy marker signals up to MHz. GPS frequency standards are expensive if purchased new.

These GPS receivers are surplus equipment. I'm not aware of the specific technology change that has placed them into this category. Since CDMA a digital spread spectrum method pioneered by Qualcomm requires each cell site to have an individual GPS receiver, perhaps a network upgrade or revision has released these receivers. This suggests that many of these receivers are becoming available. I chose to use the external RS interface. Most vendors allow return and exchange of a unit that is not performing.

Since there is a chance the unit will be returned, I did not want to modify the receiver. Modifying and soldering components on a new receiver prior to acceptance testing just doesn't make sense. These headers are located inside the receiver near the serial connector on the rear panel. The ZA photo below shows this location near the rear panel of the receiver. Install jumper headers and plugs or selectively solder jumper wires to convert to RS It is then necessary to turn the board over and remove five Zero ohm jumpers which hard wire selected the original RS interface option.

When these surface mount jumpers are removed, the new headers or solder wires will select either RS or RS [5]. The center row of pins is common. Jumper from either marked side of the PC board to the center for your selection. A two page schematic gives the details on a home made power supply and RS to RS cable converter.

Three different options for the RS to RS converter are shown. HP supplies a program called SatStat that is the front panel and control interface for the receiver. Other software offerings are available, and some offer significant advantages over HP Satstat. RS Cable Definition.

The HP ZA has these rear panel connectors:. ZA Voltage Converter Assembly. The ZA Voltage Converter assembly is 4. Keyed connectors from the main 54 volt DC input, the oven oscillator, and the main circuit board are easily disconnected. After removing five Torx T10 screws, the complete power supply assembly is ready to remove from the receiver cabinet. The main 54 volt power input has both leads fused with two small Pico fuses. F1 is rated at 10 amps and F2 is a 3 amp fuse.

These have no visible indication of a blown condition, and must be tested with an ohmmeter. Two large DC to DC power converter packages are located on this circuit board.

Some discrete active power circuitry is located on the board. The input to this regulator is fused by another small pico fuse F rated at 5A. Separate grounds are used in this circuit. The input power ground is isolated from the output DC voltage grounds. The diagram of the ZA power supply shows typical operation DC voltages. If the box color is Red , the reference ground is the minus lead of the input 54 VDC power.

A number of voltage test points are available from the component side of the power supply assembly. The outer oven controller as implemented by HP is a standard temperature bridge with the internal oven thermistor as the variable.

This circuit will stabilize the outer oven temperature, and the control voltages will vary depending upon the specific state of the outer oven control. In particular, the readings at TP op-amp error output and TP switch-mode regulator output to the outer oven heater will vary.

The values listed are nominal readings measured after extended warm-up. J21 Inner Oven Connector Pin. I'm not really so bothered about performance as a time-standard. I suspect they are all good enough for a frequency standard, but if X is better than Y, and cost the same or very similar, I would rather get X. Post by Bob Camp Post by Dr. Post by Bob Camp You have given me half the information I was looking for, but not really supplied enough for me to make a decision.

Post by Bob Camp I will try to get them to give me a photo of the actual item. Satstat may then be run normally. This utility was written by John MacConnell, and is available for download from this site with his specific permission.

The file includes information on making the null modem required for the ZA to PC serial connection. Details on the program initialization as provided by John: When you first turn on the ZA GPS receiver, it is always continuously sending time.