Tait TM8100 mobiles Service Manual page 353

Task 5 —
Check RF Output
Power
Table 12.4 Tasks to be performed according to the results of the power and current measurements
of Task 5
Power
Correct
Correct
Skewed
Low (> 0.1W)
None at RF connector (< 0.1W)
None at RF connector (< 0.1W)
TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
If the power supplies are correct, check the RF output power of the
transmitter.
Enter the CCTM command 326 5 to set the transmitter power level
1.
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
Enter the CCTM command 33 to place the radio in transmit mode.
3.
4. Note the RF output power measured by the test set, and note the
current reading on the DC power supply.
RF output power: > 30W
current: < 8A (VHF), < 9A (UHF)
Enter the CCTM command 32 to place the radio in receive mode.
5.
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 Table
7. Repeat Step 3 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 Table
9. Repeat Step 3 to
10. Depending on the results of the above measurements, proceed to the
task indicated in
considered to be skewed if they are low at one part of the frequency
band and high elsewhere.
Current
Correct
Wrong
Skewed
Low (> 0.5A)
Low (> 0.5A)
None (< 0.5A)
12.2.
Step 5.
12.2.
Step 5.
Table 12.4. Note that the power and current are
Task
Task 6 — Power unchanged regardless of setting
Task 29 — Check power at directional coupler
Task 9 — Power and current are skewed
Task 11 — Power and current are low
Task 29 — Check power at directional coupler
Task 7 — Check for inhibiting of transmitter
Transmitter Fault Finding (25W)
Table 12.2.
353