Motorola MT2000 用户手册

System
To select the desired Singletone System, use the Up/Down arrows keys, enter the system number, or use the
function keys F3 (previous) and F4 (next).  The radio may have a maximum number of 16 systems.

Tone Pretime (ms)
Use the UP/DOWN arrow keys to select or enter the desired value directly.  The Tone Pretime for Tone Signalling
specifies the length of time that "dead" carrier is transmitted between the initiation of the Tone (RAC)
transmission and the actual Tone (RAC) transmission.  The valid range is from 25-6375 milliseconds in 25
millisecond increments.  The factory default is 250 millisecond increments.  The factory default is 250
milliseconds.

Tone Duration
Use the UP/DOWN arrow keys to select or enter the desired value directly.  Upon expiration of the Singletone
Pretime period, the Singletone shall be encoded onto the carrier for the duration of the value specified in this
field.  The valid range is from 25-6375 milliseconds in 25 millisecond increments.  The factory default is 500
milliseconds.

PTT Sidetone 
Use the UP/DOWN arrow keys to Enable or Disable this field.  When the PTT Button is pressed, the radio shall
generate a continuous sidetone during transmission of the Automatic Repeater Access Codeword (RAC)
preceding a voice transmission under the following conditions:

1.  This field is Enabled
2.  Repeater Access is Enabled
3.  The Repeater Access Type is Automatic RAC

RAB Sidetone
Use the UP/DOWN arrow keys or enter directly to select Enabled or Disabled.  If this field is Enabled, a
continuous sidetone will sound during transmission of the Manual Repeater Access Codeword (MRAC), when
MRAC is initiated via the Repeater Access Button (RAB) #1 or RAB #2.  Termination of the RAB Sidetone
indicates that transmission of the RAC has been completed, and you may begin talking.