Tait TB8100 Service Manual page 167

Table 8.4 Placement of the input coupling components according to frequency band
5W
Band C109 C110
B
C
H
K
R138/ R145/
R139 R146
L
Table 8.5 Test point voltages on the LPF/directional coupler board
Test Point Pin Name
TP101 FWD-PWR-ANA
TP102 REV-PWR-ANA
TP103 +10V
TP104 LPF-DC-ROM
(OR to ground)
TP105 GND
a. Measured when the PA is set to its rated RF output power (i.e. 5W, 50W, or 100W according to model).
TB8100 Service Manual
© Tait Electronics Limited September 2006
50W 100W
C109 C110 C109
R138/ R145/ R138/
R139 R146 R139
Tx Off Tx On
Voltage Voltage
0.27V >0.27V
0.27V <0.5V
10V 10V
0V 0V
100W +
Isolator
C110 C109 C110
R145/ R138/ R145/
R146 R139 R146
a
Notes
analogue voltage, proportional to
forward power
analogue voltage, proportional to
reverse power
regulated 10V to bias the directional
coupler diodes
the microprocessor senses this input to
verify the presence of the LPF/
directional coupler board
ground
Power Amplifier Fault Finding
Component Type
IPN 018-11820-10 CAP
0603 8p2 50V NPO ±0.1pF
IPN 018-11820-10 CAP
0603 8p2 50V NPO ±0.1pF
IPN 018-11330-10 CAP
0603 3p3 50V NPO ±0.1pF
IPN 015-21100-05 CAP cer
1p0 ±0.1pF 200V 0805
IPN 036-10000-00 RES
0805 0R 1/8W
167