Harris M7300 Installation And Product Safety Manual page 78

MM-014763-001, Rev. E
For an 800 MHz band transmission, compare the wattmeter's reading with the target RF output power
range of between 27.8 and 44.1 watts (35 watts ±1 dB). This transmit output power range assumes
the radio is currently configured for high-power transmit.
8. If the wattmeter reading is within the range, record the value in the appropriate space on the data
collection form near the end of this manual.
If the wattmeter reading is outside the range, verify the radio's power supply voltage (i.e., battery
voltage) is within the specified range, recheck all connections, and measure the forward power again.
If the installation employs a ¼-wave unity-gain antenna, observe the following
checks/corrections fail to produce a reading within the range, check all cabling and connections and
repeat the testing procedure to this point. In the event the wattmeter reading still falls outside the
range, replace the antenna, make sure all connections are seated firmly, and repeat the testing
procedure. If problems persist, contact the Technical Assistance Center (see page 20).
9. Position the wattmeter's slug to measure reverse (reflected) RF power from the antenna. The arrow
on the face of the slug must point away from the antenna and to the radio to measure reverse power.
10. Key the radio's transmitter via the microphone's PTT button.
11. Compare the wattmeter reading with the RF power output range of 2 watts or less.
12. If the wattmeter reading is within the range, record the value in the appropriate space on the data
collection form near the end of this manual.
If the wattmeter reading is outside the range, make sure the antenna is consistent with the specified
frequency range of the radio. Recheck all antenna connections, and measure the reverse power again.
If the installation employs a ¼-wave unity-gain antenna, observe the
step 8. If these checks/corrections fail to produce a reading within the range, replace the antenna and
repeat the entire antenna test procedure. Any value exceeding the maximum allowable reflected
power value will result in a diminished RF output signal. If problems persist, contact the Technical
Assistance Center (see page 20).
13. Disconnect the coaxial cable jumper and wattmeter.
14. Permanently connect the cable from the vehicle-mounted antenna to the radio's antenna cable by
mating the two TNC connectors together. Use two pairs of soft-jaw pliers to gently tighten this
connection. Do not over tighten and do not twist either cable.
15. Make several test calls on the radio system to verify operation of the mobile radio. Before making the
calls, select other talk groups or conventional channels, as required to verify operation.
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Transmit only for as long as needed to take the measurement, then immediately
disable the transmission.
If the mobile radio installation employs a ¼-wave unity-gain antenna (part number
AN102800V1 or AN102800V2), the driven element (i.e., whip) of the antenna must
be trimmed to the proper length in order to minimize antenna system VSWR. Refer
to the instructions included with the antenna for trimming instructions.
Transmit only for as long as needed to take the measurement, then immediately disable
the transmission.
. If these
NOTE
that immediately follows
NOTE