Repeater Operation; 4-6-1. Transmitter Offsets; Reverse Function; Tone And Ctcss Operation - Kenwood TM-231A Instruction Manual

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-231A/
231E
+ |4+600 kHz|+1.6 MHz) +5 MHz /+ 1.6 MHz
i
= | — 600 kHz)— 1.6 MHz —5 Mbz |- 1.6 MHz
TM-331A | TM-431A | TM-431E | TM-531A | TM-531E
+12 MHz} +35 MHz
—12 MHz! —6 MHz
ie - 7.6 Mz|
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-231A/331A 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
see
is/-I[sl+isl-|j+[s[-[s
S: simplex
28
220.000 223.920 224.995
sis | = S
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 B might use 146.600 for a transmit
frequency and 146.000 for a receive frequency. !t 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