Kenwood TM-255A Instruction Manual page 28

4 COMMUNICATION
Often a Tone frequency is required to access
repeaters. For example, 88.5 Hz may be needed in
the U.S.A. or Canada, and 1750 Hz is used in Europe.
The Tone frequencies listed below can be selected.
On the TM-255E/TM-455E, press microphone [1750]
to send a 1750 Hz tone.
Any of the available tones can be selected via
Menu B, No. 53 {page 14}.
AUTOPATCH
(U.S.A. and Canada versions)
Some repeaters offer a service called Autopatch.
This feature allows you to dial a telephone number
from your transceiver and carry on a telephone
conversation. This repeater function cannot be used
for commercial transactions, but it can save lives
when used appropriately during emergencies.
Autopatch requires the use of a DTMF (Dual Tone
Multi-Frequency) keypad on your microphone. The
keypad includes the 12 keys found on a push-button
telephone plus an additional 4 keys (A, B, C, D).
These additional keys are required for various control
operations by some repeater systems.
@ Enabling the Microphone Keypad
Press [PTT]+[DTMF KEYS].
The transceiver remains keyed for approximately
2 seconds after pressing each key. This allows
you to release [PTT] once you begin entering the
DTMF keys.
DTMF Tones
Note: Some repeaters require a special key sequence to activate
Autopatch. Check with the control operator.
DUAL TONE MULTI-FREQUENCY (DTMF) CALLS
Hold down the microphone [PTT] and press [0] to [9],
[A], [B], [C], [D], [+], or [#4].
* The microphone is muted and the corresponding
DTMF tones are transmitted.
+ If two keys are pressed, only the tone combination
for the key pressed first is sent.
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