Radiometrix Ltd
TR2M Data Sheet
page 10
Transceiver Variants
TR2M is designed to be pin and polarity compatible with existing industry standard modules. Analogue
and Digital Data Output are inverted relative to original transmitted signal in Receive Mode.
The transceiver is available in two variants – TR2I and TR2M
TR2M, in Transmit Mode, frequency modulates the carrier frequency in the normal sense whereby
higher modulating voltage increases the carrier frequency and lower modulating voltage decreases the
carrier frequency which results in an inverted Analogue and Digital Data output on the TR2M in
Receive Mode. This will be the standard module and exact plug-in replacement for existing industry
standard modules.
TR2M
(TX mode)
TR2M
(RX mode)
0V
3V
No
modulation
Vcc
AF
RXD
Data slicer
TR2I, in Transmit Mode, reverses the Frequency Modulating order whereby the higher modulating
voltage decreases the carrier frequency and lower modulating voltage increases carrier frequency which
results in non-inverting Analogue and Digital Data output on the receiver. This variant can be used for
applications where data inversion will be problematic.
TR2I
(TX mode)
TR2I
(RX mode)
0V
3V
No
modulation
Vcc
AF
RXD
Data slicer
Ordering information
Part Number
Description
Frequency band
Data rate (max)
TR2M-433-5
TR2M transceiver (inverting receiver)
433.05MHz-434.790MHz
5kbps
TR2I-433-5
TR2I transceiver (inverting transmitter & receiver) 433.05MHz-434.790MHz
5kbps
TR2M-458-5
TR2M transceiver (inverting receiver)
458.525MHz-459.100MHz
5kbps
TR2I-458-5
TR2I transceiver (inverting transmitter & receiver) 458.525MHz-459.100MHz
5kbps
TR2M-458-10
TR2M transceiver (inverting receiver)
458.525MHz-459.100MHz
10kbps
TR2I-458-10
TR2I transceiver (inverting transmitter & receiver) 458.525MHz-459.100MHz
10kbps
Figure 9: Data polarity change from TR2I (in transmit mode) to TR2I (in receive mode)
Figure 8: Data polarity change from TR2M (in transmit mode) to TR2M (in receive mode)
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