User's Manual

3. Release PTT once you have finished speaking to allow other radios to respond. The radio transceiver will automatically hear received transmissions.
NOTE: You can only communicate with another radio (transceiver) that is on the same channel and using the same CTCSS/DCS code as your radio (transceiver).
SELECT A CHANNEL
The transmitter and receiver must be on the same channel using the same CTCSS code or DCS code in order for you to communicate with another party.
To select between maximum 16 channels (the CTCSS code or DCS code is set by PC program):
1. Press to increase channel number.
2. Press to decrease channel number.
SCAN FOR A CHANNEL
1. Press the key (programmable SCAN ) to enter scan mode.
2. Press PTT to enter the Tx mode on the last valid channel in memory and continue to scan after the button is released.
DB-20 OPERATION
T
he sub D-20 contains signal, control and power lines and the RF connector receives low level signals and transmits power. The radio’s 16 transmit and receive
frequencies are programmed via a PC. Pins 1, 2, 3 and 4 of the DB-20 connector select the channel. The receiver bandwidth is fixed in either a wide or narrow
bandwidth and should be ordered as such from the factory. The transmitter can be programmed for either wide or narrowband deviation on a channel by channel basis.
A monitor input activates both speaker and auxiliary outputs, allowing a modem to continually search for a signal. A high/low RF power control pin allows selection of
transmitter power level. Separate microphone and auxiliary inputs allow either pre-emphasized voice or flat data to be transmitted. Only one input should be driven at a