Specifications

Company Confidential 40 Raveon Technologies Corp.
8.10. 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 Radio
Bandwidth
Number of
Modulation
Levels
FireLine Modem Models
that support the rates
800bps (R2=0)
12.5kHz or 25kHz
2
RV-M5-UC-N, RV-M5-UC-W
1200bps (R2=1)
12.5kHz or 25kHz
2
RV-M5-UC-N, RV-M5-UC-W
2400bps (R2=2)
12.5kHz or 25kHz
2
RV-M5-UC-N, RV-M5-UC-W
4800bps (R2=3)
Default setting
12.5kHz or 25kHz
2
RV-M5-UC-N, RV-M5-UC-W
8000bps (R2=4)
12.5kHz or 25kHz
4
RV-M5-UC-N, RV-M5-UC-W
9600bps (R2=5)
25kHz
2
RV-M5-UC-W
19200bps (R2=6)
25kHz
4
RV-M5-UC-W
(will not work with Radio Type 5)
16000bps (R2=10)
25kHz
4
RV-M5-UC-W
(will not work with Radio Type 5)
5142bps (R2=7)
12.5kHz or 25kHz
2
RV-M5-UC-N, RV-M5-UC-W, RV-
M5-UC-S
9600bps (R2=8)
12.5kHz or 25kHz
4
RV-M5-UC-N, RV-M5-UC-W
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.
The maximum over-the-air baud-rate for a wide-band model (25kHz channel
spacing) is 19200bps. Due to IF filter limitations, it does not work as well at
19200 baud as lower data rates. Its performance is optimized for 9600 baud 2-
level modulation or 16000 baud 4-level.
RV-M5-UC (narrow-band version)
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.