Tait TB8100 Service Manual

TB8100 Service Manual Power Amplifier Fault Finding 167
© Tait Electronics Limited September 2006
Table 8.4 Placement of the input coupling components according to frequency band
Band
5W 50W 100W
100W +
Isolator
Component TypeC109 C110 C109 C110 C109 C110 C109 C110
B
✓✓ ✓✓
IPN 018-11820-10 CAP
0603 8p2 50V NPO ±0.1pF
C
✓✓ ✓✓
IPN 018-11820-10 CAP
0603 8p2 50V NPO ±0.1pF
H
✓✓✓ ✓
IPN 018-11330-10 CAP
0603 3p3 50V NPO ±0.1pF
K
✓✓✓ ✓
IPN 015-21100-05 CAP cer
1p0 ±0.1pF 200V 0805
R138/
R139
R145/
R146
R138/
R139
R145/
R146
R138/
R139
R145/
R146
R138/
R139
R145/
R146
L
✓✓✓ ✓
IPN 036-10000-00 RES
0805 0R 1/8W
Table 8.5 Test point voltages on the LPF/directional coupler board
Test Point Pin Name
Tx Off
Voltage
Tx On
Voltage
a
Notes
TP101 FWD-PWR-ANA 0.27V >0.27V analogue voltage, proportional to
forward power
TP102 REV-PWR-ANA 0.27V <0.5V analogue voltage, proportional to
reverse power
TP103 +10V 10V 10V regulated 10V to bias the directional
coupler diodes
TP104 LPF-DC-ROM
(OR to ground)
0V 0V the microprocessor senses this input to
verify the presence of the LPF/
directional coupler board
TP105 GND ground
a. Measured when the PA is set to its rated RF output power (i.e. 5W, 50W, or 100W according to model).

Tait TB8100 Specifications

General

Brand	Tait
Model	TB8100
Category	Accessories
Language	English