Figure 7.4 Identifying The Circuitry On The 12V Pa Boards - Tait TB8100 Service Manual

Figure 7.4 Identifying the circuitry on the 12V PA boards
b
RF output
c low pass filter/directional coupler board
d control board
e power supply
f 60W board
g microprocessor
h 6W board temperature sense
i 6W driver transistor drain current sense
j ambient air temperature board
2
1) I C signal filtering
1! RF input
1@ 12VDC output for reciter
1# 6W board
1$ pre-driver transistor
1%
6W driver transistor
1^ 50W interconnect board
1& 12VDC output
1* 28VDC output
1( 60W board temperature sense
2) 60W final transistor
2! 60W final transistor drain current sense
2@ boost regulator board
2# 12VDC input
Note:
This drawing shows a 50W VHF (B-band) 12V PA. The 5W 12V PA
has the same configuration, except the 5W interconnect board is
fitted in place of the 50W interconnect board and 60W board.
TB8100 Service Manual
© Tait Electronics Limited September 2006
2#
2@
2!
2)
1(
1*
1&
1^
1%
1$
1#
1@
b
c
d
e
f
g
h
i
j
1)
1!
Power Amplifier Circuit Description 125