The
power
transformer T1
01, has
its
primarywindings
with
three taps;100V,
115-120V,
220-240V.
It
is
easy
to
change line voltage.
The LED,
D103
is
connected across
the
+20V
power
supply through
the
RI09.
SECTION 3
OPERATION
3.1 Preparation
(1) Set the POWER switch at OFF.
(2) Connect the AC plug
to
the AC supply.
(3) Connect the
RF
output
leads
to
OUTPUT terminals.
(4) Set the FINE control at center and the
RF
slide switch
at
LOW.
During the tests, this switch is
set·
at
LOW
or
HIGH
as
required.
(5) Set the
FREQ
RANGE switch
at
the operating
band
and
rotate the frequency dial knob
to
set
the
pointer on the
desired frequency.
3.2 Connections
The
RF
leads are connected to
the
input
of
the circuit
under test. The red terminal is at high potential, or
"hot",
and
black is
at
ground potential for chassis connection.
For the
RF
signal
at
the receiver antenna
input,
connect
a 50
to
200 ohm resistor, 1/4W,
in
series. When checking sets with
the bar
or
rod
antenna, connect leads
to
a coil with a few turns
of
wire and couple the coil
to
the antenna.
In checking
RF
and
IF
amplifier circuits, connection
should be made through a small capacitor,
1-5pF,
in
order
to
-5-
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