User's Manual

ASTRO XTS 4000 21
General Radio Operation
Receive / Transmit
Radio users who switch from analog to digital radios often assume that
the lack of static on a digital channel is an indication that the radio is not
working properly. This is not the case. Digital technology quiets the
transmission by removing the “noise” from the signal and allowing only
the clear voice or data information to be heard.
This section emphasizes the importance of knowing how to monitor a
channel for traffic before keying up to send a transmission.
Without Using the Monitor Buttons
Use the Preprogrammed Monitor Button
1 Turn the radio on and select the desired zone and channel.
2 Listen for a transmission.
3 Adjust the Volume Rocker if necessary.
4 Press and hold the PTT button to transmit. Tx icon appears on
the display.
5 Release the PTT button to receive (listen).
1 Turn the radio on and select the desired zone and channel.
2 Press the Monitor button and listen for activity. The Carrier
Squelch indicator is displayed.
3 Adjust the Volume Rocker if necessary.
4 Press and hold the PTT button to transmit. Tx icon appears on
the display.
5 Release the PTT button to receive (listen).