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3
Theory of Operation
The OTX-900-HH-LR8-PRC Long-Range Handheld Transmitter uses
a HumPRC
TM
Series transceiver to form a simple, yet highly reliable RF
remote control transmitter. The HumPRC
TM
Series transceiver is a low-cost,
high performance FSK radio that utilizes a proprietary Frequency Hopping
Spread Spectrum (FHSS) technique and over-the-air protocol. The FHSS
offers much greater noise immunity and range than traditional narrow-band
transmitters.
When a button is pressed on the transmitter, power is applied to the
internal circuitry and the module is enabled. The module detects the logic
states of the button data lines. These states are formatted into a packet
and transmitted repeatedly until the button is released.
The receiving module checks the addressing in the received packet (and
encryption, if enabled). If the packet is valid and intended for the receiver,
then the module replicates the transmitter's button states on its outputs.
These outputs can then be used to activate whatever external circuitry is
required by the application.
The transmitter is compatible with the HumPRC
TM
and HumPRO
TM
product families. Ranges of up to 0.8 mile (1,300m) are possible with good
antennas and a quiet, line-of-sight environment. Applications operating
over shorter distances also benefit from the increased link reliability and
superior noise immunity provided by the radio and protocol.
By building on the HumPRO
TM
Series data module, it is simple to create
mixed-mode systems that combine data transmissions with remote control
functionality. For example, a single HumPRO
TM
Series transceiver can
accept remote control commands from the handheld transmitter as well as
sensor values from other devices in system. This greatly reduces system
cost and complexity and opens up many options for the creative designer.
Summary of Contents for HumPRC HUM-900-PRC
Page 1: ...HumPRC 900MHz Long Range Handheld Transmitter Data Guide...
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