User's Manual

DP770 Instruction Manual 17/27
4. Wait the Talk Permit Tone to finish (if enabled*), and speak to the MIC;
5. Release the PTT key to receive the call. If the target radio responses the call, GREEN LED
indicator lights on, the receiver’s call type, alias or ID display on the caller’s LCD screen.
6. If the Channel Free Indication feature is enabled, you can hear a short alert tone when
release the target radio’s PTT key, (the alert tone indicates that the channel is idle) which means
that the channel is idle and you can answer the call. Press the PTT key to answer the call or the
call ends after the preset time (call hang time) is over, “Call End” displays on the LCD screen.
7. The radio returns to the previous screen.
(2) Using the programmable key to make a call
1. Press the key programmed as Call Key to make a group/private call to the alias or ID.
2. Keep your mouth 3~6 inches away from the microphone.
3. Press the PTT key to make a call and the RED LED lights on. The receiver’s alias/ID and
the call type (private call:
, group call: ) display on the LCD screen.
4. Wait the Talk Permit Tone to finish (if enabled*) and speak to the MIC.
5. Release the PTT key to receive the call. If the target radio responses the call, GREEN LED
indicator lights on, the receiver’s call type, alias or ID display on the caller’s LCD screen.
6. If the Channel Free Indication feature is enabled, you can hear a short alert tone when
release the target radio’s PTT key, (the alert tone indicates that the channel is idle) which means
that the channel is idle and you can answer the call. Press the PTT key to answer the call or the
call ends after the preset time (call hang time) is over, “Call End” displays on the LCD screen.
7. The radio returns to the previous screen.
 Advanced Functions
Your radio also equips with the following advanced functions.
1) Radio Check
This function is used to check whether the radio is active in the system or not, while the
checked radio user cannot detect it. Except the LED flashes, there is no audible or visual
notification on the radio. The checked radio silently sends back a response to the check radio.
(1) Sending a radio check
By pressing the programmed “Radio Check” key: *
a) Press the Navigation keys
, or rotate the knob to the target contact, and press