Radio Shack 21-1904 - Manual (Page 17)

17
DIRECT CALL
OPERATION
The Direct Call data includes the
transmitter ID and receiver ID
information. You can use the
transmitter to select the receiver radio’s
ID number you want to call, and the
receiver radio only receives the Direct
Call data you select. The Direct Call
data communication is based on the
same Channel and CTCSS code
setting. You cannot establish
communication if the Channel and
CTCSS code for both radios are not the
same.
Direct Call data is sent when user
presses
CALL . The radio transmits
Direct Call data to the desired radio.
At the same time, the other radio
checks the receiving Direct Call data at
the same Channe
l an d CTCSS code. If
the Call ID number matches its Home
ID (Receiver ID number) or equivalent
Group Call, then it recognizes that the
call is addressed to this radio. As a
result, the receiver will display the
Sender ID number on the display and
generate a call melody. There are five
different call melodies to let the user
determine who is transmitting a call