Motorola DIMETRA MTS 2, Installation, Configuration And Basic Service Manual

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MTS 2 and MTS 4 Installation, Con
fi
guration and Basic Service Manual Transmitter Veri
fi
cation
Procedure 6-7 How to Verify the Transmitter (Continued)
4
At the prompt, type these three commands:
•
power -otxch1 -mpa_pwr_fwd . This command returns the current value of forward power
from the RF Power Ampli
fi
er.
•
At the prompt, type: power -otxch1 -mpa_pwr_rev . This command returns the current
value of re
fl
ected power from the RF Power Ampli
fi
er.
•
At the prompt, type: power -otxch1 -mpa_vswr . This command calculates the current
Voltage Standing Wave Ratio (VSWR) from the RF Power Ampli
fi
er.
5
At the prompt, type: alarms –ofault_hndlr . This command returns all active alarms of the
Base Radio.
6
At the prompt, type: power –otxch1 –a0 . This command stops all transmitter activity.
7
Replace the existing cable from the Base Radio TX connector with a test cable to the TX
connector. Connect a 40 dB attenuator to the other end of the cable.
8
From the attenuator, connect a cable to the RF IN/OUT connector on the TETRA Analyzer.
9
Switch off the TETRA Analyzer. Connect the Rubidium Frequency Standard to a 10 dB
attenuator. Switch on the TETRA Analyzer.
10
Connect the other end of 10 dB attenuator to the 10 MHz REFERENCE OSCILLATOR IN/OUT
connector on TETRA Analyzer.
11
Set the TETRA Analyzer to the EXT REF mode. Set TETRA Analyzer to ON and to the proper
channel type.
Table 6-8 Transmitter Verification Specifications
Parameter
Lower Side
Limit
Typical
Upper Side
Limit
MTS 2 low power, RMS
power out on Antenna port W
dbm 10
40 13
41
EVM, RMS average % 10
EVM, Peak con
fi
dence % 30
Carrier feed through /
Residual carrier % 5
TX frequency error Hz -80 80
6802800U74-N September 2009
6-25