E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

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The third is pressing and holding a button programmed for Two Tone. This will enter the 
Two Tone List. Again, from this point, scrolling to the desired tone in the list and pressing 
PTT or the select button will activate and store the Two Tone. Finally, Two Tone can be 
activated by using Emergency Analog Signaling, ANI Analog Signaling, or RTT Analog 
Signaling. 

For direct activation (through button press or PTT/Select Button press in the Two Tone 
List), the “Allow Two Tone Page” function must be enabled in programming. If “Allow 
Two Tone Page” is not enabled and the user tries to send a Two Tone Page directly the 
radio will bad beep.

The Two Tone Decoder allows the radio to be configured to require tones of a particular 
frequency and pattern to be received before the radio unmutes the speaker to received 
audio. 

If a conventional channel is not configured with a two tone decode list, the radio operates 
as normal and the radio does not decode two tone codes.

Two tone decode is available on digital mixed mode channels. However, the two tone 
encoder is disabled unless the transmit type is set to analog.

An option is now available to enable side tones. When the two tone encoder is activated 
the radio plays the tones on the speaker.

The radio transmits five tones. The first four tones are the Five Tone ID of the radio. The 
last tone is based on the radio mode (Normal Call, Emergency Call).

MDC1200 is a signaling protocol designed and implemented by Motorola for analog 
channels only. The following features of this protocol are supported. Either MDC1200 or 
standard DTMF ANI/Emergency signaling can be programmed on each conventional 
system.

MDC1200 ANI - Both pre and post ANI are supported.

MDC1200 Emergency Alert - A retry counter is implemented. Currently, ACKs are 
not decoded so the radio retries the programmed number of times with each emergency.