New Models - MotoTRBO

New RXC-3080-Trbo with Virtual DTMF signaling works with Motorola MotoTRBO portable and mobile radios in true digital mode.




Tone Remote

Tone Remotes are employed to remotely control transmitters. A remote may be located in the same building as the transmitter, or they may be separated by many miles and use telephone lines or microwave links to connect the transmitter with the tone remote.

Control signals and voice are sent from the tone remote, over the dedicated pathway, to the transmitter. It is necessary to install an interface board in the transmitter to convert the tone remote signals to actual channel and Push-to-Talk (PTT) functions.


Standard Tone Remote Frequencies Relative Levels Tone Duration
High Level 2175 Guard Tone
10 dbm
120 msec
1950 Hz Transmit F1 Function
0 dbm
40 msec
1850 Hz Transmit F2 Function
0 dbm
40 msec
2050 CTCSS Monitor Function
0 dbm
40 msec
Low Level Guard Tone
-20 dbm
20 msec
Voice Peaks
0 - 5 dbm

Other tones may be employed to provide additional functions. These other tones will use the same 0 dbm level and 40 msec timing as those shown above.

Tone Freq.
Receiver 2
Receiver 2
Max Squelch
Repeater Off
Min Squelch
Repeater On
Freq. 3
CTCSS 1 Select
Option 1 On
Freq. 4
CTCSS 2 Select
Option 1 Off
CTCSS 3 Select
Option 2 On
CTCSS 4 Select
Option 2 Off


There are two ways the Tone Remote signals are sent.

Single Tone Format

Function Tones are sent as a separate item from the PTT signal. A Function Tone is sent at 0 dbm for 350 msec. While a PTT signal (2175) is sent at -10 dbm for the entire time the voice is being transmitted.

Sequential Tone Format

In this method, a guard tone of 2175 is sent at +10 dbm for 40 msec, followed by a function tone at 0dbm for 40 msec, which is then followed by a continuous PTT tone of 2175 at -20 for the entire duration of the voice transmission.


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