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6802800U74-AN
Chapter 6: Configuration and Testing
6.5.4.2
Transmitter Verification
Table 80: Transmitter Verification Specifications
Parameter
MTS 2 low power, RMS
power out on Antenna
port
EVM, RMS average
EVM, Peak confidence
Carrier feed through / Re-
sidual carrier
TX frequency error
6.5.4.2.1
Verifying the Transmitter
Prerequisites: Take the MTS out of service.
WARNING: RF energy burn hazard. Disconnect power in the cabinet to prevent injury and
equipment damage while disconnecting and connecting antennas.
IMPORTANT: Unless it is already out of service, Motorola Solutions recommends performing
this procedure during off-peak hours to minimize or eliminate a disruption of service to system
users.
When and where to use: This procedure provides commands and responses to verify proper
operation of the transmit path for the Power Amplifier and is recommended after replacing the Base
Radio module.
IMPORTANT: BR-Arch-1 Base Radios: To avoid the risk of causing a high bit error rate to
occur, do not use 385.572 MHz and 419.175 MHz as receiving frequencies in the Base Radios
of the MTS.
Procedure:
1 Log on to the Test Application of the Base Radio.
See
Logging on to the Test Application on page
2 Type power -otxch1 -a0 in the command line.
This command dekeys the transmitter.
3
NOTICE: The following commands key the transmitter. Make sure that transmission only
occurs on licensed frequencies or into an RF dummy load. To ask for the current
transmitter frequency, enter: freq -otxch1. To change the transmit frequency, enter:
•
for BR-Arch-1: vco -otx_all -f<X>
•
for BR-Arch-2: freq -otx_all -f<X>
where <X> is a transmit frequency. For example, to set the transmit frequency to
410.0125 MHz, type vco -otx_all -f410.0125.
To key the transmitter with a T2 type channel type these three commands:
246
Lower Side
Limit
W
10
dbm
40
%
%
%
Hz
-80
Typical
13
41
225.
Upper Side
Limit
10
30
5
80
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Troubleshooting
