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2.5
The
following items are
numbered
to
correspond with
those in the
front
panel
illustration
Fig.
2.1.
The power
supply
and
r.f.
tuning control are
described
first,
followed
by
those
for
modulation and output
control.
POWER
SUPPLY
AND
RF
TUNING CONTROL
2.6
(T)
POWER
ON/
OFF
Switch
.
RANGE MHz
Switch.
(T)
FREQUENCY MHz
Display.
This
double
pole toggle switch
is
in
the
a.c. mains
input.-
'In
.the:
OFF
position
the a.c.
supply
is
disconnected
from
all
except
the
mains
fuse.
In
the
ON
position the
instrument
is
fully
operational
and
the
adjacent
POWER
ON
l.e.d. indicator
is
illuminated.
Thisl.e.d.
is
supplied from
the
+12V
line.
The
five position rotary
switch
selects the
five
r.f.
frequency
ranges
which
are
referred
to
by range numbers
as follows:-
Range
No.
Frequency Range
*
1
2
3
4
5
1
.5
(5 for
9081)
to
35MHz
31
to
67
MHz
61
to
134
MHz
122
to
268
MHz
244
to
520
MHz
The
carrier
frequency
is
measured by
the internal
digital
frequency meter
and
displayed
on
the
digital
LED
readout.
For ease of operation there
is
a four
digit
display
(100
kHz
resolution)
in
FAST
tune.
This
is
increased
to six digits
(1kHz
resolution
in
SLOW
tune
and
to
the
maximum
eight
digit,
10
Hz
resolution,
in
HOLD
mode.
These frequency ranges
are those normally obtainable
and
slightly
exceed
the ranges
shown by
the
front
panel markings.
9081
&
9082
Vo
1
.
2
2-4
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