RA89 DTMF function operation steps

RETEVIS RA89 is a 10w dual-stage analog walkie-talkie with complete functions and favorable price. It is Ham's favorite. You can use the DTMF function to realize functions such as single call, group call, stun, and death. Today’s article lets us learn about DTMF together.
What is DTMF?

RA89 DTMF function operation steps

DTMF (Dual Tone Multi Frequency) consists of high frequency group and low frequency group. The high and low frequency groups each contain 4 frequencies. A high-frequency signal and a low-frequency signal are superimposed to form a combined signal, which represents a number. DTMF signals have 16 codes. DTMF signaling can be used to selectively call the corresponding intercom.
DTMF is a type of user signaling between telephones and switches in the telephone system, and is usually used to send called numbers.

DTMF signaling transmission method:

Use PTT ID to send DTMF, select PTT ID type: BOTH, BEGIN, END, press PTT to send the code or release the code (usually this method is not used, if set, then press ptt and the code will be sent, if you want Closing requires reading and writing frequency)

Press PTT first and then press side button 1 to send the code. The code sent is the code set by the TYPE sequence. Then you can select Select Ch in the software, or select No. 1 in the machine submenu 10 (it is recommended to adopt this method, you can select the preset code in the menu DTMF)

Notice:

1. The channel must select DTMF signaling so that DTMF can be sent and received on the current channel.
2. After selecting DTMF signaling for the channel, in addition to meeting the frequency and sub-audio settings, the reception of the current channel must meet the single call or group call reception conditions before the machine can turn on the speaker to receive voice.

DTMF decoding method:

1. ANI identification code--individual call
2. Set Group Code: Group calling code---implement group calling

Single call:

Delimiter: When making an ANI call (individual call), set the other party's ID + the type set by Delimi ter + the local ID (to achieve individual calls)

For example:

The OwnID of machine A is 122, the Own of machine B is 123, the Delimiter of machine A and machine B is set to *, the Type sequence 1 of machine A is set to ANI123*122, the Type sequence 1 of machine B is set to ANI122*123, then machine B sends the code Type sequence 1 can make a single call to machine A. Then machine A can send a code Type sequence of 1 to make a single call to machine B.

Group call:

Group Code: Group calling code. For example, if the ID of the other party's intercom is 120-129, then you can call the intercom with the ID of 120-129 by sending code 12A.

For example:

the OwnID of machine A is 122, the OwnID of machine B is 123, the Group Code of both machine A and machine B is A, the Type sequence 6 of A machine is set to 12A, the Type sequence 6 of machine B is set to 12A, then the Type sequence of machine B is sent 6 can be used to group call machine A, then machine A can send a code type sequence of 6 to group call machine B.

Dtmf Speed (ms): DTMF sending time

First Digi t (ms): First digital time

Auto Reset Time (s): Automatic reset time

Side Tone: There is a beep prompt when sending the code

Distant and shaken to death:

Remotely stun or shake the receiver by sending a DTMF code that is the same as the remote stun or shake ID of the receiver;
The wake-up code is to faint or shake to death: add # to the number
As shown below

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