User's Manual

Company Confidential 37 Raveon Technologies Corp.
8. Tune-up and Alignment
Do not key the transmitter for more than 30 seconds
out of every 300 seconds. The transmitter is rated at
10% duty cycle maximum.
Radio calibration and alignment is performed using the ATRx commands. The
FireLine modem has been factory calibrated, in should not require any re-
calibration when installed, or when changing frequency or channel. Unless the
user is trained in radio test and calibration, the values stored in the R registers
should not be modified.
Alignment and calibration of the RV-M5-VB-N2 radio modem must only be
performed by qualified radio service personnel.
Improper adjustment of the radio calibration (R0-R9 and RA registers), can
result in failure of the radio modem.
Calibration and alignment values are stored internal to the modem in the “R”
registers. (R0-R9 and RA). For example, to read R5, issue the ATR8 command
without any parameter. To change the setting, issue the ATR8 nn command,
where nn is the new value you would like to store.
Once you read a register using an ATRx command, you may modify its value by
entering a “U” for up or a “D” for down. U or D will change the value by one. Use
this trick carefully, because it modifies the last R register that was read, and it is
easy to unintentionally modify the wrong register.
8.1. Periodic Calibration
The only setting that may require adjustment is the center frequency. After years
of operation, all crystals will age and change frequency slightly. The ATR8
command is used to adjust the center frequency. Like all narrow-band radios,
semi-annual checks and adjustment of frequency is recommended.
8.2. 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.
8.3. TX Deviation
1. Switch to channel 1.