rotation will increase the threshold level which a signal must overcome
in order
to
be heard. Only strong signals will be heard at a maximum
clockwise setting.
4.
TONE. This control
is
used
to
shape the audio response to the
operators preference.
Base
is
increased by counterclockwise rotation
and trebel
is
increased by clockwise rotation.
S.
RF
GAIN. Adjust
as
required
to
optimize the signal. This control
is
used primarily
to
optimize reception
in
strong signal areas. Gain
is
reduced
by
counterclockwise rotation
of
the control.
6. DELTA TUNE. For normal operation set the control
to
the center
position. This feature has several uses and can greatly enhance receiver
operation. First,
if
a received signal
is
slightly
off
frequency, the
Delta-Tune control can be operated as required
to
optimize the received
signal level. The effectiveness
of
the Delta-Tune feature under these
conditions can be observed either
by
listening for a more readable signal
at the speaker
or
by
noting the S-meter reading when the Delta-Tune
control
is
operated. Another effective application
of
this control
is
in
eliminating adjacent channel interference.
If
it
is
verified that an
exceptionally
high
level signal from an adjacent channel
is
creating
interference
on
the channel being used, the Delta-Tune can be used to
minimize
or
eliminate the interference. Operate the control
as
required
to
obtain minimum adjacent channel interference.
7.
SWR
CAL CONTROL. In order for you
to
achieve maximum radiated
power and the longest range,
it
is
important
that
your antenna be
in
good condition, properly adjusted and matched to your transceiver.
The built-in
SWR
(standing wave ratio) meter lets
you
easily measure
your antenna condition. To operate this function, connect your
antenna
to
the transceiver antenna
output
connector. Select a channel
near the middle
of
the band such
as
21, or the channel you plan
to
use
most frequently. Turn the power
on
and set the meter function switch
to
the CAL position. Press and hold the microphone push-to-talk
button;
using the
SWR
CAL control, adjust the meter
to
read the CAL
position indicated on the meter face. Then, without releasing the
microphone
button,
switch the meter function switch
to
the
SWR
position and read the
SWR
indicated. The lower the figure, the better,
with l being ideal. Generally speaking, readings up
to
3 are acceptable,
but
over 3 indicates that you are losing radiated power and antenna
adjustment may be advisable.
15
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