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58
DUAL TONE MULTI-FREQUENCY (DTMF) FUNCTIONS
The following DTMF functions require the MC-53DM or
MC-45DM (option) microphone. The keypad on the
microphone 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.
MAKING DTMF CALLS
1 Press and hold Mic [PTT].
2 Press the keys in sequence on the keypad to send
DTMF tones.
• The corresponding DTMF tones are transmitted.
• Your transceiver remains in the transmit mode for 2
seconds after you release each key. So you can release
[PTT] after beginning to press keys.
■ Autopatch (U.S.A. and Canada)
Some repeaters in the U.S.A. and Canada offer a
service called Autopatch. Autopatch allows you to
access the public telephone network by sending DTMF
tones. Some repeaters require a special key sequence
to activate Autopatch. Check with the repeater control
operator.
■ Mic Keypad Confirmation Tones
When pressing the desired keys on the Mic keypad, this
function produces feedback tones for your confirmation.
1 Press [MNU] to enter Menu mode.
2 Turn the Tuning control, or press Mic [UP]/[DWN],
to select Menu No. 16 (Microphone).
3 Press
[
ss
ss
s
],
then select Item No. 6 (DTMF Monitor).
4 Press
[SET]
to toggle the function ON or OFF
(default).
5 Press [MNU] again to exit Menu mode.
1336
Freq. (Hz)
1477
1209
1
4
7
1633
697
770
852
941
A
B
C
D
2
5
8
0
3
6
9
#
PWRPWR
VOL SQL
CALLCALL
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