TN182 Battery Level Reporting and Remote P25 Test Tone
MT-4 Radio Systems
TECHNICAL NOTES
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CODANCOMMS.COMTECHNICAL NOTE:
TN182, REV 1-0-0, © Mar 2017
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Battery Level Reporting is a method of activating a repeater remotely to have it transmit a signal that reports the
battery voltage level over RF. The Remote P25 Test Tone is a remotely activated Standard 1011 Hz P25 test tone
transmitted out of a repeater that allows a mobile coverage test to be done with a receiver performing a P25 Bit
Error Rate test.
Both the Battery Level Reporting and Remote P25 Test Tone are only available in a repeater confi guration with
a receiver connected to a transmitter through the front panel RJ45 Control bus. It can be a direct connection, or
through a CI-RC-4L repeater controller or a CI-RC-4M-G2 Multiple Link Controller. The Battery Level Reporting
and Remote P25 Test Tone are activated by a DTMF signal sent over RF to the repeater receiver.
The Battery Level Reporting and Remote P25 Test Tone features requires transmitter fi rmware version 2.10.9 (or
higher), receiver fi rmware version 2.9.8 (or higher) and RSS version 1.7.6 (or higher).
Battery Level Reporting
When the receiver receives a DTMF code of ##123 (or any three-digit programmed ID code), it will initiate the
transmitter with the corresponding three digit value (ID code of 123) to key up and transmit the battery level.
• The battery level is measured internally by the transmitter every two seconds.
• The battery reporting transmission can be stopped by another PTT from a subscriber radio.
• A DC off set adjustment (of the 13.8V line reading) is required for each transmitter. The procedure of this adjustment
is described in Battery Level Reporting DC Off set Adjustment Procedures.
Analog Mode
In analog mode, an audio tone that corresponds to the battery level of the repeater system is transmitted. For
example, a 1380 Hz tone transmitted over the air corresponds to a battery level of 13.80 Vdc.
• The duration of the reporting transmission is user programmable but has to be at least ten seconds.
• The deviation of the analog tone can be adjusted in the software as the tone volume.
P25 Digital Mode
In P25 digital mode a DTMF tone sequence that corresponds to the battery level of the repeater system is
transmitted. The battery level reporting is a DTMF tone sequence in the following format (in P25):
• Example - B125A123
• B marks the beginning of the battery level.
• The three 0 to 9 digits make up the battery level reporting.
• B125 means battery level of 12.5 Vdc
• A marks the beginning of the ID code of the transmitter reporting the battery level.
• The three 0 to 9 plus A, B, C, D digits is the ID code of the transmitter that reported the battery level.
• The number of times the battery report string transmits is user programmable but has to be at least two times.
• The duration of the silent P25 frame gap between each DTMF sequence is user programmable.
• The P25 Digital DTMF tone sequence volume can be adjusted in the tone volume.
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