Tait TM8110 Service Manual

332 Transmitter Fault Finding (25W) TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
12.2 Transmitter RF Power
Introduction If there is no fault with the power supplies, check the transmitter RF power
and correct any fault. The procedure is covered in the following eight tasks:
■ 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
The measurement points for diagnosing faults concerning the transmitter
RF power are summarized in Figure 12.5. Data required for the first task
(checking the forward and reverse powers) are supplied in Table 12.3.
Table 12.3 Voltages in millivolts corresponding to nominal forward and reverse powers
Frequency band Forward power (318 command) Reverse power (319 command)
A4 2700 to 3900 <700
B1 1100 to 2000 <500
C0 1100 to 2000 <500
D1 1600 to 2500 <700
H5 2500 to 3500 <1000
H6 2800 to 3900 <1000

Tait TM8110 Specifications

General

Brand	Tait
Model	TM8110
Category	Radio
Language	English