User's Manual

Printed Documentation
136
Go to Top Menu >Setup Menu >RF Menu>TX Power
TX power
To set the CT to transmit at QPSK or 16QAM adjust the TX Power until the output of the
transmitter by increasing or decreasing the value until the level tabulated below is
reached. If the CT is required to operate with a downlink of 64QAM then the output
should be backed off by 3dB. Note: This will affect the system coverage and should be
taken into account at the radio planning stage.
Band Power Meter
Reading QPSK and
16QAM
Power Meter Reading for
64QAM
P See Below N/A
X 21.4dBm 18.4dBm
All
other
24.4dBm 21.4dBm
P Band
To comply with FCC requirements for Spurious Emissions at Block Edges, the transmit
power of the CT should be reduced for channels 180, 181, 214 and 215 as detailed below.
Channel Downlink
(MHz)
Uplink
(MHz)
Power
Commissioning
mode 1
180 1932.00 1852.00 18.9 dBm
181 1933.00 1853.00 22.4 dBm
182 to
213
- - 23.4dBm
214 1987.00 1907.00 22.4 dBm
215 1988.00 1908.00 19.4 dBm
Record the value and output level.
Set commissioning mode to Off, then set to commissioning mode 3. Check that the power
meter reading increases by 8.7dB (+/- 1dB). If the reading is lower RF compression may
be occurring.
Note if it is required to measure the output power with all the RWs enabled set the CT
commissioning mode to off and then set the commissioning mode to 2. This sets all 13
RWs active. To return to commissioning mode 1 set the CT commissioning mode to off
and then set the commissioning mode to 1. (Note the setting to off is important and it is
not possible to go directly between 1 and 2.)