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5.9 AF
BOARD
(X49-1020-10) (See Figure 26)
The AF board is the final stage of the receiver section. The
circuit includes a low-pass filter (Q1 and Q2), a complimen-
tary amplifier (Q6 and Q7), and a driver amplifier (04 and
Q5). The output
impedance
can be selected at 8 ohms or
600 ohms.
A side-tone generator circuit, to monitor CW transmissions,
is also included on the AF board.
FIGURE
26.
AF Board
R40
IK
"T]
14v —<iav
Pd
©
GND
=
Ss
CIB 220 16V
oy
x
=H
(@) SP —> Speaker
2
(ea)
4
e
x
Ay
ahi
z
7/88
'Side tone level)
VPI
47KB
|
PH ——DLine out
(6000)
x
1 i
35
si
——————
— 4)
Srv'
Qi,2 + 28¢733(0)
a
Qs, : 280373
Qs' :28734(Y)
ONE
SHureUr
Qe
:2scio6i
Qr
:2sa671
Di
:IN60
MEENA SEERe)
DE anid
AF Unit (X49-1020-10)
nt
=|
mn
FIGURE
27.
AF Schematic
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