User's Manual

14221-1200-4010, Rev. B

As stated in the NOTE on page 78, the wide power level range takes into account errors

caused by test cable loss, etc.

11. 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 (page 90).

If the wattmeter reading is outside the range, verify the MRU 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 the Technical Assistance Center (see page 21).

12. Position the wattmeter’s element to measure reverse (reflected) RF power from the antenna. The

arrow on the face of the element must point away from the antenna and towards the MRU to measure

reverse power.

13. Key the transmitter via the microphone’s PTT button.

Transmit only for as long as needed to take the measurement, then immediately disable the

transmission.

14. Compare the wattmeter reading with the RF power output range of 15 watts or less. This limit exists

because the multi-band (untuned) antenna has a VSWR of 3:1.

15. 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 (page 90).

If the wattmeter reading is outside the range, make sure the antenna is consistent with the specified

frequency range of the MRU. Recheck all antenna connections, and measure the reverse power again.

If this fails 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 see

page 21).

16. Un-key the transmitter by releasing the microphone’s PTT button.

17. Disconnect the coaxial cable jumper and wattmeter.

18. Permanently connect the MRU Multi-band antenna cable to the MB ANT (TNC) connector on the

rear of the radio.

Improper installation of the RF cables may lead not only to poor radio performance

but also to harmful exposure to RF electromagnetic energy.

NOTE