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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An Adjustable Courtesy Tone option allows customization of the courtesy tone transmitted at the end of an analog
or P25 Digital transmission. The Adjustable Courtesy Tone is available in addition to the Fixed Courtesy Tone
implementation. The Radio Service Software (RSS) allows selection of either the fi xed or Adjustable Courtesy
Tone. If the Adjustable Courtesy Tone feature is disabed, the hang timer / courtesy tone will revert to it’s previous
(older fi rmware) method of programming and operation. This selection is made under Service->Courtesy Tone.
The Adjustable Courtesy Tone feature requires transmitter fi rmware version 2.10.9 (or higher) and RSS version
1.7.6 (or higher).
Figure 1: Adjustable Courtesy Tone
With the Adjustable Courtesy Tone, users may set diff erent courtesy tone settings for the following scenarios:
• transmission is shorter than a user programmable length
• transmission is longer than a user programmable length
• 13.8 Volt line (Supply Voltage) is below (or above) user programmable threshold #1.
• 13.8 Volt line (Supply Voltage) is below (or above) user programmable threshold #2.
• Courtesy Tone when input pin B14 or Z14 on the Transmitter module is asserted.
This is the MT-3 PTT NTO pin. Accessible as J1-3 (TX A PTT) for TXA and J1-11 (TX B PTT) for TXB on the
back panel Auxiliary connector (P1). Also, JU21 must be installed in the A position for TXA and JU20 must be
installed in the A position for TXB.
• Loss of Network condition
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