TN181 Adjustable Courtesy Tone
MT-4 Radio Systems
TECHNICAL NOTES
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TN181, REV 1-0-0, © Mar 2017
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Setting the Adjustable Courtesy Tone
The priority level of each scenario can be independantly selected, or any scenarios can be individually disabled.
The priority arrangement must be the same for both analog and P25 digital mode.
The courtesy tone operation consists of 2 tones. Both tones can be programmed the same or diff erently or as
silent.
To have a silent tone in analog mode, simply set the volume of the tone to “0” or set the tone to 0 Hz. To have a
silent tone in P25 digital mode, set the tone frequency to 0 Hz.
The courtesy tone generated in analog mode is done after the pre-emphasis stage of the signal processing
chain of the transmitter. Therefore it will always come out as fl at audio response. Separate volumes controls are
provided for the fi rst and second tones in cases where the listening receiver is using de-emphasis.
In P25 mode, the following hang time behaviors are off ered:
• Silent Voice Frame Only
• Silent Voice Frame + Tone
• Simple Terminator Data Unit only (typically used for P25 encrypted calls)
• Simple Terminator Data Unit + Tone (typically used for P25 encrypted calls)
Sample tone setup for the Adjustable Courtesy Tone:
- Set the “Adjustable Courtesy Tone” option to ‘Enable’.
- Set the “Battery Reading Level 1 Trigger” to the low voltage trigger point. Such as 10 Vdc
- Set the “Battery Reading Level 2 Trigger” to the High voltage trigger point. Such as 17 Vdc
- In the Analog table set the two tones and level for the Battery Level 1 and 2.
- Set the Priority to 1 and all other priorities to 0 if the other settings are not used.
The transmitter will now send a two tone at the end of a transmission if the voltage goes below or above the
indicated voltage trigger point.
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