User's Manual

T90-DTU User Manual
6
4.3. Frequency and channel numbers
Model No.
Default Frequency
Frequency Range
Channel Interval
Channel numbers
Hz
Hz
Hz
T90-DTU
920M
920~925MHz
1M
81，half duplex
★ Note: In the same area when multiple data transceivers are communicating one to one at the same time , it is
recommended to set the channel spacing between each group of data transceivers at 2MHz or more.
4.4. Transmitting power
Model No.
22dBm
17dBm
13dBm
9dBm
T90-DTU
-
-
-
√
★ Note: The lower the transmit power, the closer the transmission distance, but the working current won’t be
declined in exact proportion , it is recommended to use the maximum transmit power.
4.5. Air data rate
Model
Default
Levels
Air data rate (bps)
bps
bps
T90-DTU
2.4k
8
0.3、1.2、2.4、4.8、9.6、19.2、38.4、62.5k
★ Note: The higher the air data rate, the faster the transmission rate, the transmission distance is also closer; when
the rate meets the requirements , the lower air data rate, the better quality.
4.6. Current
Model
TX current mA
Standby current mA
12V
24V
12V
24V
T90-DTU
45
26
10
7
★ Note: It is recommended to retain more than 50% of the current margin when selecting the power supply, which
will help the data transceiver to work steadily for a long time.