Transmitter Rf Power - Tait TM9100 Service Manual

12.2

Transmitter RF Power

If there is no fault with the power supplies, check the transmitter RF power
Introduction
and correct any fault. The procedure is covered in the following eight tasks:
The measurement points for diagnosing faults concerning the transmitter
RF power are summarized in
(checking the forward and reverse powers) are supplied in
Table 12.3 Voltages in millivolts corresponding to nominal forward and reverse powers
Frequency band
B1
H5
H6
324 Transmitter Fault Finding (25W Radios)
Task 4: check forward and reverse powers
Task 5: check RF output power
Task 6: power unchanged regardless of setting
Task 7: check for inhibiting of transmitter
Task 8: check temperature sensor
Task 9: power and current are skewed
Task 10: repair output matching circuitry
Task 11: power and current are low
Forward power (318 command)
1100 to 2000
2500 to 3500
2800 to 3900
Figure 12.5. Data required for the first task
Reverse power (319 command)
< 500
< 1000
< 1000
© Tait Electronics Limited August 2005
Table 12.3.
TM9100 Service Manual