ITC 220 Base Station, Locomotive & Wayside Radio Transceiver Field Service Guide PN 0046300120 Rev. A
| Page 45
where:
value
can be a positive (+) or negative (–) number in dB (resolution to 1/10
th
of a dB), depending on whether
you want to increase or decrease the power level.
3.
Once observation of radio performance is complete, turn off transmit operations by typing:
L1_TEST,STOP
To make power settings persistent across power cycles (all transceivers)
If a TXPOWER level other than the default is permanently desired then you must save the setting. The procedure will
vary depending on whether or not the
FACTORY,DEFAULT,INIT
command is included in the CIM file.
Note:
If you do not know if the
FACTORY,DEFAULT,INIT
command is included in the CIM file then contact your
network administrator.
If the
FACTORY,DEFAULT,INIT
command
is not
set in the CIM:
In XtermW type:
SAVE
This will result in a change sustained across power cycles.
If the FACTORY,DEFAULT,INIT command
is
set in the CIM:
The CIM script must include:
TXPOWER,MAX
TXPOWER,–nnn.nn
where:
nnn.nn
is the power reduction factor pre-determined by site survey technicians and is customized for
each radio site operating at reduced transmit power levels.
The
TXPOWER,MAX
command is required to ensure a known reference. The second command assigns a reduced
level (in dB units) relative to that reference.
This will result in a change sustained across power cycles.
Caution
– The following table shows the limits of the RF power output of the radio transceivers. Settings
outside this range for operation for an antenna are out of FCC compliance.
It is the user’s responsibility to confirm that settings are within compliance.
Table 13 Rated RF Power Output
Parameter
Wayside Transceiver
Locomotive Transceiver
Base Station
Conducted Carrier
Output Power Rating
25 W PEP nominal
50 W PEP nominal
75 W PEP nominal
Adjustment range
7.5 to 25 W
15 to 50 W PEP
10 to 75 W PEP*
*7.5 W PEP is +38.7 dBm peak. Average power would be about 3 dB less. The base range of 10 to 75 W is less than a 9 dB range.