DUAL TONE MULTI-FREQUENCY (DTMF) FUNCTIONS

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The following DTMF functions require the MC-53DM or

MC-45DM (option) microphone. The keypad on the

 

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microphone includes the 12 keys found on a push-button

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telephone plus an additional 4 keys (A, B, C, D). These

additional keys are required for various control operations

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by some repeater systems.

 

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MAKING DTMF CALLS

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1 Press and hold Mic [PTT].

 

2Press the keys in sequence on the keypad to send

9DTMF tones.

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• The corresponding DTMF tones are transmitted.

11• Your transceiver remains in the transmit mode for 2 seconds after you release each key. So you can release

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[PTT] after beginning to press keys.

 

 

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Freq. (Hz)

1209

1336

1477

1633

 

■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 [s], then select Item No. 6 (DTMF Monitor).

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697

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3

A

15

 

 

 

 

 

770

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6

B

 

16

 

 

 

 

 

852

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9

C

 

CALL

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PWR

VOLSQL

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17

941

0

#

D

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4Press [SET] to toggle the function ON or OFF (default).

5Press [MNU] again to exit Menu mode.

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Kenwood TM-V7A Dual Tone MULTI-FREQUENCY Dtmf Functions, Autopatch U.S.A. and Canada, Mic Keypad Confirmation Tones
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TM-V7A specifications

The Kenwood TM-V7A is a sophisticated dual-band transceiver that has garnered the attention of amateur radio enthusiasts worldwide. Designed for VHF and UHF operations, it offers a plethora of features that enhance communication capabilities and provide a robust user experience.

One of the standout characteristics of the TM-V7A is its dual-vfo (variable frequency oscillator) configuration, which allows users to monitor two frequencies simultaneously. This feature is particularly useful for coordinating communications across different bands or for listening to two channels at once. The large, bright LCD display provides clear visibility of the operating frequency, with the ability to monitor a wealth of information, including received signal strength and battery voltage.

The TM-V7A supports a wide range of operating modes, including FM, AM, and SSB, making it versatile enough for different communication needs. The device is compatible with CTCSS (Continuous Tone-Coded Squelch System) and DCS (Digital-Coded Squelch), which adds significant convenience for group communications by reducing unwanted noise and interference.

Another important feature is its built-in APRS (Automatic Packet Reporting System) functionality. This allows operators to transmit their position automatically and share information with other APRS users. The built-in GPS capability enhances this feature, providing accurate location tracking that can be particularly beneficial during emergency response situations or for outdoor events.

For enhanced audio quality, the TM-V7A is equipped with a high-performance audio filter and variable bandwidth control. This allows operators to tailor the audio output based on the conditions of the band and personal preferences, improving clarity and intelligibility during conversations.

The transceiver is also designed with user-friendly navigation. The intuitive menu system enables easy access to settings and configurations, allowing operators of all experience levels to operate the radio effectively. Customization options further enhance user experience, with programmable memories allowing operators to save frequently used frequencies and settings.

The Kenwood TM-V7A’s rugged build quality ensures durability, making it suitable for both home and field operations. Its compact design allows for easy installation in vehicles or portable setups, making it an excellent choice for both casual users and serious amateur radio operators. Overall, the Kenwood TM-V7A stands out as a feature-rich transceiver capable of meeting the diverse needs of the amateur radio community, combining advanced technology with practical functionality.
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