6. repeater operations – Kenwood TM-431E User Manual
Page 28
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4-6. REPEATER OPERATIONS
4-6-1 .Transmitter Offsets
All
amateur
radio
repeaters
utilize
a
separate
receive
and
transmit
frequency.
The
receiver
frequency
may
be
either
above
or
below
that
of
the
transmit
frequency.
The
config
uration
of
most
repeater
will
fall
into
one
of
the
categories
listed below:
TM-231 А/
231E
TM-331A
TM-431A
TM-431E
TM-531A
TM-531E
+
-(■ 600 kHz -И.6 MHz
-(-5 MHz
-1-1.6 MHz -М2 MHz
+ 35 MHz
-
- 600 kHz
-1.6 MHz
-5 MHz
-1.6 MHz
-12 MHz
-6 MHz
--
-7.6 MHz
Offset Direction
To
select
the
desired
transmitter
offset
direction
press
the
SHIFT key. Each time you press the key the transceiver will
advance from one direction to the other, i.e. " + " to " - ”
to "----------- ” with European versions) to no offset
(simplex).
Automatic
Offset
Selection
(TM-231A/331A
U.S.A.
version)
The TM-231 A/331 A has been programmed according to the
standard
ARRL
(Amateur
Radio
Relay
League)
Band
Plan
with
regard
to
transmitter
offset
direction.
Please
see
the
accompanying
chart
for
addition
information
on
this
programming.
You
can,
of
course,
override
this
by
using
the
SHIFT key if desired.
145.1 145.5 146.0 146.4 146.6 147.0 147.4 147.6 148.0
S
—
S
+ s
—
s
—
s
S: simplex
28
220.000
223.920
224.995
4-6-2. Reverse Function
Some
repeaters
utilize
a
"Reverse
Pair",
i.e.
the
transmit/
receive
frequencies
are
exactly
the
reverse
of
another
repeater.
For
example repeater A uses 146.000 for a trans
mit
frequency
(INPUT)
and
146.600
for
a
receiver
frequen
cy
(OUTPUT).
Repeater
В
might
use
146.600
for
a
transmit
frequency
and
146.000
for
a
receive
frequency.
It
would
be
inconvenient
to
have
to
reprogram
the
transceiver
each
time you wanted to use these repeaters.
The REV key allows you to easily reverse the transmit and
receive frequencies. To use the REV function press the REV
key. The REV indicator will turn on in the display to remind
you that you are working a reverse pair.
To return to normal press the REV key again. The REV indi
cator will turn off.
This
function
is
also
useful
to check
the
input
frequency
of
the
repeater
so
that
you
can
determine
if
you
are
within
range for simplex communications.
4-6-3. Tone and CTCSS operation
Some repeaters require the use of a control signal to acti
vate
the
repeater.
Several
different
methods
are
currently
in use.
In
the
United
States
sub-audible
tones
are
sometimes
used.
38
different
Sub-audible
frequencies
are
possible.
With
the
use
of
the
optional
Sub-Audible
tone
decoder
unit
(TSU-6)
you will be able to operate in a Tone Operated Squelch