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MM-012099-001, Rev. B
78
9.17.2 Digital Mode
The Digital Mode allows the radio to transmit and receive digitized voice signals. Digital signals provide
improved weak signal performance and cannot be easily monitored with a standard receiver. Groups and
channels programmed for digital operation transmit only digital signals. Individual phone calls (I-Calls)
are answered back in the mode in which they were received assuming the call or hang time is still active.
Individual phone, all call, and emergency calls are transmitted clear if the digital mode is disabled or
inoperative.
1. If receiving an analog message trunked call, the radio responds in the analog mode during the
hang time on the working channel.
2. If receiving an analog I-Call, the radio responds in the analog mode during the hang time.
3. When using the *WHC* feature to respond to an I-Call (after the hang time has expired), the call
is transmitted in the mode defined by the system mode as programmed for the current system if
the ID being called is not in the I-Call list. If the ID is in the I-Call list, then the call is transmitted
as defined by the I-Call mode programmed in the list for that ID.
The overdial DTMF tones are not available while in the Digital Mode.
9.17.2.1 Scanned Group Calls
Receiving a Scanned Group Call is the same as receiving a selected group call. During the scan hang
time, if the radio was programmed for auto-select, it will transmit back in the same mode it received the
call. For example, if a clear group is entered in the scan list, it will only receive clear calls. If the same
group was available in digital and entered in the scan list, it can receive clear and digital calls, provided
auto-select was programmed in the radio. The user can choose to transmit on the scanned or selected
group. If a group is entered in the scan list more than once under different modes (clear and digital), only
the first occurrence of the group will be used.
Table 9-5: Transmit/Receive Mode Compatibility for Digital Voice Operation
GROUP/CHANNEL PROGRAMMING
(TRANSMIT)
CLEAR
RECEIVE
DIGITAL
RECEIVE
CLEAR Yes No
DIGITAL Yes Yes
Conventional digital channels require Channel Guard on the channel to operate
correctly.
The voice coding technology embodied in this product is protected by intellectual
property rights including patent rights, copyrights, and trade secrets of Digital Voice
Systems, Inc. The user of this technology is explicitly prohibited from attempting to
decompile, reverse engineer, or disassemble the Object Code, or in any other way
convert the Object Code into human-readable form.
9.18 RECEIVING A CALL
1. Select the desired conventional system/channel or turn scan ON and make sure desired channel is in
scan list.