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CHANNEL
SPACING
Switch.
The
setting of
the
CHANNEL
SPACING
switch
depends upon
the type of operation
required
as
follows:-
(1)
For a
channelized
type
of
operation
the switch
is
set to
the particular
kHz
spacing required.
(2)
For a
non-channel
operation
the red
/\
f
position
can be
used.
With
the
TUNE
switch
set to
SLOW,
this
gives
the lowest possible
value
of
frequency
increment
(steps) for
each
frequency
band,
as
shown
in
Table
1.
Precise
tuning
can be completed
in
HOLD
mode.
When
FAST
tune
mode
is
selected,
how-
ever, the
channel spacing
reverts
to
the
maximum
possible
for
the
band
in
use.
TABLE
1
.
Frequency
Increments
in
Z\f
Mode.
Range
Switch
Position
.
Frequency
Increments
(Slow Tune)
.
Remarks.
1
.5-32 (5-32
for
9081)
2.5kHz
These are
the
/\f
32-64
0.625kHz
frequency increments with
64-128
1.25kHz
SLOW
TUNE
selected.
128-256
2.5kHz
On
FAST
TUNE
the
256-512
5.0kHz
instrument tunes
in
40kHz
increments.
STEP
Switch
This
is
a centre-biased three-position toggle
switch
in
which each
movement
of the switch
shifts
the
r.f.
tuning
by
one
channel
(UP
for
a higher
frequency and
DOWN
for
a lower).
This step
selection
can be repeated
until
the
desired
channel
is
reached.
9081
&
9082
Vol. 2
2-6
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