272
Transmitter Fault Finding (40W/50W)
TM8100/TM8200 Service Manual
© Tait Electronics Limited
June 2006
Task 5 —
Check RF Output
Power
If the power supplies are correct, check the RF output power of the
transmitter.
1.
Enter the CCTM command
326 5
to set the transmitter power level
to the maximum value.
2.
If not already done, program the radio with the highest frequency in
the radio’s frequency band: Enter the CCTM command
101
x x
0
,
where
x
is the frequency in hertz. The required values for the
different frequency bands are given in
.
3.
Enter the CCTM command
33
to place the radio in transmit mode.
4.
Note the RF output power measured by the test set, and note the
current reading on the DC power supply.
5.
Enter the CCTM command
32
to place the radio in receive mode.
6.
Program the radio with the centre frequency in the radio’s frequency
band: Enter the CCTM command
101
x
x
0
, where
x
is the frequency
in hertz. The required values for the different frequency bands are
given in
7.
Repeat
to
8.
Program the radio with the lowest frequency in the radio’s frequency
band: Enter the CCTM command
101
x
x
0
, where
x
is the frequency
in hertz. The required values for the different frequency bands are
given in
9.
Repeat
to
10.
Depending on the results of the above measurements, proceed to the
task indicated in
. Note that the power and current are
considered to be skewed if they are low at one part of the frequency
band and high elsewhere.
RF output power: > 60W (VHF), > 52W (UHF)
current: < 15A (VHF), < 12A (UHF)
Table 11.4
Tasks to be performed according to the results of the power and current measurements
of
Power
Current
Task
Correct
Correct
— Power unchanged regardless of setting
Correct
Wrong
— Check power at directional coupler
Skewed
Skewed
— Power and current are skewed
Low (> 0.1W)
Low (> 0.5A)
None at RF connector (< 0.1W)
Low (> 0.5A)
— Check power at directional coupler
None at RF connector (< 0.1W)
None (< 0.5A)
Summary of Contents for TM8235
Page 1: ...TM8100 mobiles TM8200 mobiles Service Manual MMA 00005 04 Issue 4 June 2006...
Page 10: ...10 TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 62: ...62 Description TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 148: ...148 Disassembly and Reassembly TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 162: ...162 Servicing Procedures TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 178: ...178 Interface Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 258: ...258 Receiver Fault Finding TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
Page 446: ...446 Spare Parts TM8100 TM8200 Service Manual Tait Electronics Limited June 2006...
