ashtech Z-eurocard, Operation Manual

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Equipment 21
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Serial/Power Cable
The serial/power cable (Figure 2.9) connects the Z-Sensor to the power source, the
PC or handheld unit, and any peripherals.
Antenna
The Z-Sensor provides DC power on the center conductor for an LNA on the antenna
cable. The gain of the LNA minus the loss of the cable and connectors should be
between 20 and 45 dB. Connect the antenna cable directly to the antenna connector
on the Z-Sensor. Antenna cables exceeding 15 dB of loss require a line amplifier. A
Line Amp (p/n 700389) compensates for 20 dB of cable loss. The Line Amp has N-
type connectors to connect to the antenna cable.
On-Board Battery
Both the Z-Sensor and Z-Eurocard contain a 3.6V lithium backup battery to maintain
power to the non-volatile memory and real-time clock when the main power source is
not available. This battery should last a minimum of 5 years. The firmware monitors
the battery voltage, and detects a failure when it reaches 2.25 volts. You can obtain
this information via any serial port with the $PASHQ,WARN command (refer to the
Z-Family Technical Reference Manual for detailed information about this command).
Figure 2.9: Z-Sensor Serial/Power Cable