Company Confidential
9
Raveon Technologies Corp.
6.3. Center Frequency
1. Key the transmitter with CW output using this command:
ATTD 7
2. The modem will now put out CW on the center of the channel.
3. Read the frequency offset with the
ATR8
command.
4. Adjust the frequency to the center of the channel with the
ATR8
command. You can use the “U” key and the “D” key to change the
settings up and down one value in real time.
6.4. TX Deviation
1. Switch to channel 1.
2. Key the transmitter into a 50 ohm load using the
ATTD 3
command. The
unit will now transmit, and send a digital 0 continuously. This should be
+2.0kHz in frequency for narrow-band radios (12.5kHz spaced channels)
and +3.0kHz for wide-band (25kHz channels).
3. Adjust the deviation register setting so that the frequency deviation is
correct. The deviation is set with a digital adjustment. Use the ATR0
command to read or set the deviation level.
