TB8100 Service Manual Reciter Circuit Description 63
© Tait Electronics Limited September 2006
Figure 2.15 Identifying the circuitry on the RF board - B and C bands
b
external reference input
c
mixer and post-mixer buffer
d
receiver VCO
e
receiver VCO trimmer
f
IF tuning elements - narrow bandwidth
g
IF tuning elements - wide bandwidth
h
receiver synthesizer
i
IF
j
TCXO
1)
audio buffers
1!
exciter VCO
1@
exciter VCO trimmer
1#
exciter synthesizer
1$
exciter RF output
1%
FCL
1^
FCL buffers
1&
power supply
1*
external reference switch/internal VCXO reference
1(
front end second doublet
2)
front end second doublet trimmers
2!
front end
2@
front end first doublet
2#
front end first doublet trimmers
2$
low pass filter
2%
receiver RF input
Note:
In order to show as much of the circuitry as possible in the
photograph, the SMD shields have been removed. The
photograph shows a B-band reciter. The layout of the C-band
reciter circuitry is identical.
b
c
d
e
g
h
i
1%
1&
1*
1(
2@
2#
2$
j
1)
1!
1@
1#
1$
1^
2%
f
2)
2!
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