User's Manual

Company Confidential 31 Raveon Technologies Corp.
6.9. Setting the Over-The-Air Data Rate
The SkyLine has programmable over-the-air baud rates. The over-the-air rate is
stored in register R2, and is programmed with the ATR2 x command, where x is
a number corresponding to the rate. The are 8 possible baud rates, but not all
rates may be used with all radio modem models. Consult the following table.
Over-the-air rate Number of Modulation
Levels
800bps (R2=0) 2
1200bps (R2=1) 2
2400bps (R2=2) 2
4800bps (R2=3) Default setting 2
8000bps (R2=4) 4
5142bps (R2=7) 2
9600bps (R2=8) 4
Changing the over-the-air data rate will change the sensitivity of the receiver.
Higher-data rates require a stronger signal at the receiver to be properly
received. The default over-the-air data rate for FireLine radio modems is 4800
baud for narrow-band versions, and 9600 baud for wide-band versions.
The maximum over-the-air baud-rate for a narrow-band radio (12.5kHz channel-
spacing) is 9600bps. Due to IF filter limitations, the FireLine does not work as
well at 9600 baud as some other rates. Its performance is optimized for 4800
baud 2-level modulation and 8000 baud 4-level modulation.
RV-M5-VB
Factory default, set R2 to 3 (4800 baud).
For high-speed operation, set R2 to 4 (8000 baud).
For best range (longest distance), set R2 to 1 (1200 baud)
Other data rates of 0(800bps), 2(2400bps), 3(4800bps), and 7(9600bps) will
work, but have a less optimal bit-error-rate vs. receive sensitivity.
6.10. Debug Related Commands
Bench Testing
(Must be in command mode to test. Enter +++ at the keyboard to put unit into config/test mode.)
ATTD x Various transmit test routines.
0 = Go back to normal mode. Stops the test.
1 = Random data transmit.
2 = Hop up/down one channel
3 = Force PLL to fast lock mode
4 = Transmit all 0s
5 = Transmit all 1s