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The TR1M 128-channel 12.5/25kHz narrowband FM-transceiver module is intended as a general-purpose VHF unit covering any 1MHz switching bandwidth specified in the frequency range of 135 to 175MHz. It is capable of supporting data rates of up to 5kbit/s over distances of 1km. The synthesiser-based module shares a common pin-out and features with the company's popular UHF TR2M product offering. Like the TR2M, it offers RF designers an analogue and digital interface with a transmit power of +20dBm and a receiver sensitivity of -118dBm. The module can be utilised in environmental monitoring, data loggers, and industrial telemetry/telecommand designs.