User's Manual

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Banner RM912HP Transceiver
1 Watt, 900 MHz FHSS Module
User Manual
Overview
The Banner RM912HP device is a frequency hopping spread spectrum transceiver
operating in the 902 – 928 MHz band. It is an implementation of a particular ISM band
transceiver IC that includes an external LNA in the receive path and external 1 W power
amplifier in the transmit path, as well as all necessary RF switches and matching
components. Users need only supply power and ground, control signals, and a controlled
impedance path to one of our FCC approved antennas to fully implement the device
transceiver.
Typical users of this module are projects that are conceived and built by Banner
engineering, usually for low power wireless sensor network telemetry. Projects will
fundamentally be time division multiple access (TDMA) architecture with frequency
hopping spread spectrum (FHSS) employed for distributing RF energy evenly across the
ISM band.
Users will have to comply with the hopping schedule, number of channels, dwell
times, and other parameters that are covered in FCC part 15, and bounded by the limits
set up in the test report. All questions regarding these limits should be directed to the
factory.
This certification only covers operation of the transceiver in particular modes of
modulation scheme and data rate. Be aware that there are modes of operation on the
transceiver IC that are not covered by this certification and must be avoided by the user.
This document will discuss fixed and configurable parameters and their relation to
meeting the FCC specifications. Such parameters include the frequency plan, the time
sharing architecture, power control, and approved antennas.
Frequency Plan
The radio is licensed to transmitting or receiving on any of 50 equally spaced,
non-overlapping channels available in the 902-928 MHz band. (903, 903.5, 904, 927.5
MHz) The hop table should be chosen from this bin of 50 frequencies in a pseudo-
random fashion without replacement so as to avoid repeats before the entire table is
traversed.
TDMA Plan
The radio is intended for operation in deterministic and ad-hoc networks. The
communications channel is shared in these networks using a time domain multiple access
protocol. The underlying structure to this protocol is a frame made up of N time slots,
each of length T
slot
. During each time slot, a given radio could spend part of its time
transmitting (T
on
), receiving, or idle to conserve energy. Users must keep the total dwell
time on any given transmit channel below 64 ms in any given 100 ms window.