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9.
If the wattmeter reading is within the range,
record the measured 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 RF output power
again. If this fails to produce a reading within the range, replace it and repeat this procedure. If
problems persist, contact M/A-COM’s Technical Assistance Center (see page 16).
16.4 TRANSMITTING INTO THE MOBILE ANTENNA
1.
Connect the antenna cable from the vehicle-mounted 700/800 MHz antenna to the wattmeter as
shown in Figure 16-1.
2.
If not already, turn the radio on and set it to OTP mode. Refer to Section 16.1 as necessary.
3.
Set the radio to a test talk group, if available.
It is recommended that a test talk group be allocated for this testing. Otherwise,
interference with other radio users in the system may occur.
Also, during
transmissions, always observe the RF exposure-related safety information
presented in Section 1.2 on (begins on page 6).
A peak-power reading RF wattmeter equivalent to the wattmeter specified in Table
16-1 must be used. Do
not
use an average or RMS-responding wattmeter.
4.
Position the wattmeter’s slug to measure forward RF output power. Rotate it if necessary. The arrow
on the face of the slug must point away from the radio and towards the antenna for forward power
measurements.
5.
Set the wattmeter to measure peak RF power.
6.
Key the radio’s transmitter via the microphone’s PTT button.
7.
Compare the wattmeter reading with the target RF output power range of
11.8 – 20.0 watts.
Transmit only for as long as needed to take the measurement, then immediately
disable the transmission.
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 this fails 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 M/A-COM’s Technical Assistance Center (see page 16).
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.
Verify the wattmeter is still set to measure peak RF power.
11.
Key the radio’s transmitter via the microphone’s PTT button.
