COMPUTIME CTLM901 900MHz Radio Telemetry Module User Manual

Computime Limited 900MHz Radio Telemetry Module

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4700 Duke Drive, Suite 200 Ultra-Long-Range, General Purpose 900MHz Radio Telemetry Module 12 April-2011 Revision 1.1 Cincinnati Technologies 4700 Duke Dr. Suite 200 Mason, OH 45040
4700 Duke Drive, Suite 200 900 MHz Radio Telemetry Module Description This document describes the features and architecture for a general purpose 900 MHz telemetry transceiver module with exceptionally long range and reliable communications. Architecture Radio Standard and IC Selection The module is designed around the Atmel AT86RF212 802.15.4 transceiver IC. The 802.15.4 radio standard is an especially good choice as it provides for operation under the FCC CFR 15.247 spread spectrum rules, at significantly higher transmit power levels than would otherwise be allowed. The engineers at Cincinnati Technologies have engaged in the development of spread spectrum radio products and technologies for two decades, beginning with the design and manufacture of the first spread spectrum residential cordless telephone in 1992. Transmit Power Level For small, low duty cycle battery-powered applications transmitters operating at 50-100 milliwatts have been found to work well. It is high enough to achieve excellent range and coverage but low enough in DC power consumption to work well with AA cells. Data Rate and Receiver Sensitivity The AT86RF212 transmitted data rate is software selectable from 20 kbits/second to 1000 kbits/second. Higher data rates will yield longer battery life due to shorter transmitter on times. Lower data rates yield better receiver sensitivity and longer range. This tradeoff is easily optimized for each application. Integrated Diversity Antennas The benefits gained by use of two antennas are twofold. First, in environments rich in RF reflections, a phenomenon known as multi-path fading will frequently reduce the received signal level. A second antenna with different radiation characteristics will have different fades. The second benefit is based on the fact that antennas do not perform equally in all directions. By using two antennas with pattern nulls in different directions the module can choose to operate with the antenna with the lowest path loss to the far end.
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Document ID1649109
Application IDNbkHsDoPG9q5zTshL+GIbg==
Document DescriptionUsers manual
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatAdobe Acrobat PDF - pdf
Filesize2.52kB (31464 bits)
Date Submitted2012-03-06 00:00:00
Date Available2012-03-06 00:00:00
Creation Date2012-03-06 08:35:41
Producing SoftwareAcrobat Distiller 8.1.0 (Windows)
Document Lastmod2012-03-06 08:35:41
Document TitleMicrosoft Word - user manual.doc
Document CreatorPScript5.dll Version 5.2
Document Author: zmp
FCC ID Filing: DI2CTLM901

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