Transmitter Rf Power - Tait TM9100 Service Manual

11.2

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 11.3 Voltages in millivolts corresponding to nominal forward and reverse powers
Frequency band
B1
H5
H7
TM9100 Service Manual
© Tait Electronics Limited August 2005
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)
2600 to 3400
3200 to 3900
3300 to 4000
Transmitter Fault Finding (50W/40W Radios)
Figure 11.7. Data required for the first task
Reverse power (319 command)
< 500
< 700
< 900
Table 11.3.
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