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TECHNIEAL
DESCRIPTION
GENERAL
Fiqure
9
is a block
diagram
of the [/]odei
2245
Receiver showing
the main
functional elements
and
input and output
signal
routing.
Each Afl and
Fß,4
front end has its own
lF stages.
For clarily,
onlv
the leJt audio channel
is shown;
the right
audio
channel
is identical.
The
|\4ONO switch
is common
to both chännels.
All audio controls
are
ganged,
or
con(entrically
clulched, to
lhplr coJnLelporls
il
the
righl channel.
The left channel
half o{
the
front
panel
dubbing
lN and dubbing
OUT
jacks
are
shown
interconnected
in this diagram.
The
right
cl-annel
of each
iacl
i\ wired
lo lhe san_e
circuit
point
in the
riqht channel.
11
FRONT
END
Fl\4 antenna
signals are applied
through a
balun
transformer
and the antenna
ATTENUATOR
switch
to the antenna coil
which drives
a fied-
effect
transistor RF amplifaer.
When
the AT-
TENUATOR
pushswitch
is
placed
in the
"out"
position
the attenuator
circuit is cut
oJf the
Fivl
siqnals
are direclly
fed to the
FIM
antenna
coil.
With
ATTENUATOR
pushswilch placed
in the
"in"
position,
the signals
are attenuated
about
20dB by
the attenualor
circuit, then
fed to the
antenna
coil. The signals
from the RF amplifier
are
{ed through the doubl+tlned
RF tank
circuit to
rhe FET
l\,4ixer stage, which is also
fed by the signal
J
Figure 9.
Functional
Block
Diagram
FUNCTIONAL
DFSCRIPTION
")
16


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