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OPERATION
After
power
and antennas are
connected
and a crystal
(or
crystals) has
been installed,
your
PR0
-
16A
is
ready
to
use.
Turn
VOLUME
"on",
by
rotating
to
the right.
Rotate
SQUELCH
fully
counterclockwise.
Set all
the
Channel
Lock-out
Buttons
"on"
(press
in).
You
should
hear a rushing sound
from
the
speaker.
Now
adjust
SQUELCH
clockwise
until
you
no
longer hear
the
rushing
background
noise
(fu
rther
explanation
of
SQUELCH
adjustment
is
noted
below).
If
you
want
the
PR0
-
16A
to
continuously
scan
the
channels
for
which
you
have crystals installed,
you
must
adjust SQUELCH
as
instructed
above,
then
press
SCAN/MANUAL
button
in,
to
the SCAN
position.
The
PR0-16A
will
constantly
scan each channel
in
sequence;
when
a
signal appears
on
one
of
the
channels,
the
receiver
will
lock
onto
that
channel and
you
will
hear
the
signal.
If
you
do
not
want
automatic
scanning
on
one
or
more
channels, press
their
Channel
Lock-out
Buttons
"off"
(press in
to
release
the
button
so
it
pops
out).
If
you
want
to
stay
tuned
to
one channel
only,
press
SCAN/MANUAL
button
again
to
make
it
pop
out
to
the
MANUAL
position.
The
Receiver
will
stop
automatic
scanning;
now
press
MANUAL
SELECTOR
button
to
advance
to
the
channel
you
want
to
listen
to
(as
indicated
by
the
Light).
For
MANUAL
scanning,
the
receiver can
be
either
"squelched"
or
"unsquelched",
for
Automatic
scanning,
SQUELCH
must
be set
to
eliminate
the
background
noise.
To
eliminate
the
annoying
background
noise,
rotate
SQUELCH
clockwise
until
the
background
noise
just
stops.
You
can't
adjust
SQUELCH
properly
while
listening
to
a
station,
so
wait
till
signals
cease.
If
you
set SQUELCH
as
noted
above,
the
PR0-16A
will
appear
"dead"
until
a signal comes
in;
when
a signal comes
in,
the
Squelch
circuit
"opens
up"
and
you
hear
the
signal. When
the
signal
ceases,
the
Squelch
circuit
"closes"
and cuts
out
all sound
until
the
next
signal comes
in.
- 8 -
PRIORITY:
In
most
areas
there
is
usually one channel
you
will
want
to
monitor
consistently.
The
Priority
function
allows
you
to
do
this
and
yet
you
can
still
scan all
the
other
channels.
When
the
PRIORITY
Button
is
pressed
in,
the
scanner w ill operate
as
usual-scanning
across channels 1
thru
16
looking
for
an
active
channel. However,
if
it
should
stop
on any channel
other
than
the
priority
channel
for
more
than
two
seconds, the Receiver
will
automatically
scan back and check
the
priority
channel.
This
priority
channel sampling occurs
almost
instantaneously and
if
the
priority
channel
is
not
active,
the
scanner
returns
to
the
channel
being
monitored
previously.
This
scan-back takes
only
six-
hundredths
of
a second,
so
there
is
scarcely
any
interruption
to
the signal
you
were
monitoring.
If
the
priority
channel
is
active,
the
scanner
will
continue
to
monitor
it
until
it
clears, and
then
return
to
the
channel
previously
being
monitored.
SCAN RATE (Scan
Speed):
You
can vary
the
scanning rate
from
about
10
to
20
channels per
second
by
adjusting
SCAN
RATE.
Use
the
setting
that
seems best
for
your
needs.
It
is
particularly
useful
when
using
PRIORITY-you
can
get rapid scanning, plus fast scan-back checking
of
the
Priority
channel.
SCAN DELAY:
The
PR0-16A
has a
built-in
2 second delay
feature
which
virtually
eliminates
missed replies.
This
circuit
holds
the
Receiver
on
the
channel
you
are
monitoring
for
a
period
of
2 seconds
after
the
carrier
has gone
off
the
air,
before
it
resumes
normal
scanning
funct
ion.
This