FreeWave LRS400S, Manual

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LRS400S Data Transceiver Users Manual
LUM0025AA Rev A Version 1.0 18
(3) X
MIT
R
ATE
FreeWave transceivers utilize a Master Transmit Beacon to provide low current consumption in the slave
radios. The slave radios will turn their receiver off when no data is being passed.
The Xmit Rate setting allows the duty cycle of the Master Transmit Beacon to be changed. A setting of 0
is the highest duty cycle and a setting of 9 is the lowest duty cycle.
(4) RF D
ATA
R
ATE
FreeWave transceivers have five settings for the RF Data Rate (1, 2, 3, 4, 5 ). RF Data Rate should not
be confused with the serial port Baud Rate.
Setting 2 should be used when the transceivers are close together and data throughput needs to be
optimized. Setting 3 should be used when the transceivers are farther away and a solid data link is
preferred over data throughput.
Note: In MultiPoint networks, the RF Data Rate must be set identically in all transceivers. Any
transceiver with an RF Data Rate different from the Master will not establish a link.
In Point to Point networks the Master’s settings take precedence over the Slave.
RF Data Rate Setting Occupied Bandwidth Modulation Level
1 50kHz 2-level GFSK
2 25kHz 4-level GFSK
3 25kHz 2-level GFSK
4 12.5kHz 4-level GFSK
5 12.5kHz 2-level GFSK
(5)RF X
MIT
P
OWER
The RF Xmit Power parameter allows the user to control the output transmit power up to two watts
(+33dBm).
Note: For use in applications requiring greater than 70% transmit duty cycle, the LRS400S series of
radios must be attached to an appropriate heat sync.
The following table shows RF TX output versus the RF Xmit Power setting.
RF Xmit
Power
RF TX
Power
(dBm)
RF Xmit
Power
RF TX
Power
(dBm)
RF Xmit
Power
RF TX
Power
(dBm)
RF Xmit
Power
RF TX
Power
(dBm)
10 +33 7 +30 4 +27 1 +24
9 +32 6 +29 3 +26 0 +23
8 +31 5 +28 2 +25