Instruction manual

24 Chapter 3 Operation
MDC-1200® Call Alert
The VMDE-200 is capable of both ―Long call alert‖ and ―Short call
alert‖. The personality programming of the radio permits the
selection of which call alert will be used for transmit. In receive, the
VMDE-200 will react to either type, but a received short call alert will
not have sender ID information.
To Send a call alert, press the <A> button until ―ALERT‖ appears in
the display then press the <B> button to select the target radio. If an
alias table is present, the radio enters the alias mode of ID selection.
If there is no alias table, any valid ID can be entered. If you desire to
enter an ID instead of the alias, press and hold the <B> button for
longer than 2 seconds. Refer to page 28 for more information. If an
error is made in the ID entry, continue to fill out the four character ID
and then press <C> and reenter the ID. After the ID is entered,
momentarily press the radio PTT to send the message. Data is sent
and then the radio unkeys. If an acknowledgment is received from
the target radio, the display changes to —ACK— . If no
acknowledgment is received in five seconds, the display changes to
alternating between the target ID (or Alias) and —NAC—for five
seconds. If the target ID that was entered contains ―wildcards‖
signifying that it is a group or all-call, the acknowledge bit in the
signaling packet will be cleared and no ACK will be expected. ID’s
that contain E or F can be entered by pressing * for E and # for F.
If the radio receives a call alert command with a matching ID, the
radio responds by emitting a series of tones. If the received alert
was a ―long call alert‖, the display will alternate between the sending
ID (or Alias) and —CALL—. If the received alert was a ―short call
alert‖, the display will only show —CALL—. The call alert tone is
repeated every 10 seconds. Pressing the <CLR> button or keying
the radio silences the alert tones and reverts the display to channel
information. The radio will send the appropriate acknowledgment to
the requesting radio.
MDC Voice Select Call
In a system that uses Voice select call, all radios remain muted until
their ID is received. Then the radio unmutes until loss of receive
carrier.
To converse with another user in a voice select call system, press
the <A> button until VSC appears in the display then press the <B>
button to select the target radio. If an alias table is present, the radio
enters the alias mode of ID selection. If there is no alias table, any
valid ID can be entered. If you desire to enter an ID instead of the
alias, press and hold the <B> button for longer than 2 seconds.
Refer to page 28 for more information. If an error is made in the ID
entry, continue to fill out the four character ID and then press <C>
and reenter the ID. After the ID is entered, press the PTT and talk.
VSC data will be transmitted to open the target radio and
communications may proceed. This VSC mode remains in effect to
permit continued conversations until the <C> button is pressed.
While in VSC mode, the display will show alternating between the
target ID (or Alias) and —VSC—. ID’s that contain E or F can be
entered by pressing * for E and # for F.
When the radio receives a Voice select call command with a
matching ID, the radio responds by emitting a series tones and