User's Manual
Table Of Contents
- Foreword
- Important Safety Information
- Contents
- About this Document
- Related Publications
- Product Description
- Features
- Specifications
- Air Interface
- Product Functionality
- Contents
- Integration Goal and Objectives
- Customer Problem Isolation
- Wireline and Wireless Communications
- Design Tips for Serviceability
- Environmental Issues
- Regulatory Requirements
- Contents
- Power Supply
- Host Interface
- Power Management
- Antenna Systems
- Hardware Recommendations
- Battery Selection Criteria
- Contents
- Hardware Integration
- Application Software
- Final Assembly
- Installation
- Troubleshooting
- End User Problem Resolution
- Service Depot Repair
- Contents
- Accessories and Options
- Abbreviations and Acronyms
- Desense Overview
- Desense Measurement Techniques
- Preparing the Device Under Test
- Performance Goals
- Methods of Controlling Emissions
- Antenna
- Summary
- FLEX Application Protocol Licensing
- Licensing
4-20 July 23, 2002
Hardware Integration CreataLink2 XT Hardware Integrator’s Guide
Antenna Systems
Resetting the Data Transceiver
There are three ways to reset the data transceiver:
• Remove and reapply power
• Issue the Set Power CLP command to the ON state. This results in a software-
generated reset (see Communication Linking Protocol Reference Manual)
or use the equivalent API call for on-board/embedded applications.
•Use the RESET_ENABLE and EXT_RESET pins on the 22-pin connector (first set
RESET_ENABLE/pin 9 high, then set EXT_RESET/pin10 low). After reset, set the
pins back to their original state, or the device will remain in reset.
Antenna Systems
This chapter describes how to select an antenna and incorporate it into a product
package. It is not within the scope of this document to include answers to questions
for every possible application. SmartSynch, Inc. recommends that you consult an
antenna design engineer to address individual application concerns.
Antenna Safety
When you design the antenna for a product that integrates the CreataLink2 XT
device, adhere to the following American National Standards Institute (ANSI)
safety criterion:
The design of the integrated product must be such that the location used
and other particulars of the antenna comply with the then current
American National Standards Institute (ANSI) Guidelines concerning
radio frequency energy exposure and with any other nationally
recognized radio frequency standards that may be applicable thereto.
Antenna Selection Criteria
Be aware of the fact that antenna selection, mounting, and location has a major
impact on communication performance. Bad antenna selection, mounting, or
location can result in very poor system communication performance.
The following are guidelines for good antenna selection:
It is not recommended to use a high gain antenna for two reasons:
1. The Base Station transmitter and Base Station receiver are not collocated.
They may be in opposite directions.
2. By using a high gain antenna, you may be exceeding the FCC radiated
emissions limits.
Frequency range 896 MHz to 942 MHz band minimum
Polarization Vertical
Gain 0 dBi to +3 dBi
Normal Impedance 50 ohm
VSWR 1.75:1 maximum in the specified frequency range
It is recommended to use an antenna with a ground plane.