Kenwood TM-521E - Manual (Page 16)

4-6-2. Offset Direction
To select the desired transmitter offset direction
press the SHIFT key. Each time you press the key the
radio will advance from one offset to the other, i.e.
" - h " to to with TM-421ES Euro­
pean version) to no offset (simplex).
4-6-3. 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 transmit frequency (OUTPUT) and
146.600 for receive (INPUT). Repeater B uses
146.000
for its receive and 146.600 for its
transmit frequency. It would be inconvenient to have
to reprogram the radio each time if you were in range
of both repeaters.
The REV key has been provided to allow you to
reverse the transmit and receive frequencies.
To use the Reverse function press the REV key. The
REV indicator will light in the Display Panel to remind
you that you are working a reverse repeater pair.
To return to normal offsets press the REV key again.
This function is also useful to check the input fre­
quency of the repeater, so that you can determine if
you are within simplex communications range.
(With the TM-221ES/421ES/521E)
Transmission is inhibited when the REV key is
engaged.
4-6-4. Tone Operations
Some repeaters require the use of a control signal to
activate the repeater. Several versions are currently
in use worldwide.
(With the TM-221A/321A/421A/521A)
Subaudible tones are sometimes used. In the United
States 38 different subaudible tone frequency selec­
tions are possible. (See Section 4-7 TONE FRE­
QUENCY SELECTION)
(With the TM-221ES/421ES/521E)
In Europe a 1750 Hz tone is used in transmit. Press
the TONE key to transmit the access tone, then
press the PTT switch.
In the United Kingdom a 1750 Hz tone burst at the
beginning of each transmission is used.
Since use of this tone is required in the Europe and
the United Kingdom, an 1750 Hz tone encoder is in­
cluded as standard equipment.
4-6-5. Autopatch (U.S.A. only)
Some repeaters offer a service known as autopatch.
This allows you to dial a telephone number from your
radio and carry out a telephone conversation, much
like a car telephone, or cellular telephone. This func­
tion requires the use of a DTMF (Dual Tone Multi Fre­
quency) pad. In addition to the normal 12 keys that
are
found on your telephone the MC-48B
microphone also provides 4 additional keys. A, B, C,
and D. These keys are required by some repeater
systems for various control functions. You should
check with the control operator of your repeater to
determine if their use is required. A chart is provided
that lists the tones that are generated when you
press each key.
2 .
3.
To activate the DTMF pad, press and hold the
PTT switch.
Now press the keys just as you would dial a
telephone.
The radio will remain keyed for about 2 seconds
after you press each number, so you can release
the PTT switch without unkeying the radio.
AUDIO TONES
v^igh Tone
Low
Tone (Hz)
1209 1336 1477 1633
697 1 2 3 A
770 4 5 6 B
852 7 8 9 C
941 ♦ 0 # D
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