User's Manual
Table Of Contents
- Contents
- 1 Overview
- 2 DC and AC Characteristics
- 3 Electrical Interface
- 4 SPI Interface and Sequences
- 5 Power States
- 6 Messaging Protocol
- 7 microNode Provisioning
- 8 Antenna Diversity
- 9 Regulatory Considerations
- 10 Manufacturing Considerations
- 11 Errata
- Appendix A Abbreviations and Terms
- Appendix B PCB Land Pattern and Vias
- Appendix C REACH AND RoHS Compliance
- Appendix D On-Ramp Wireless RMA Process
- Appendix E microNode Mechanical Drawing
On-Ramp Wireless, Inc. 48 014-0033-00 Rev. H
11 Errata
Degraded RF Channels
The microNode uses a Channel scheme such as the following:
Channel 1 = 2402 MHz and each successive channel is 1.99 MHz offset to that Channel 1.
Channel 2 = 2403.99 MHz
Channel 3 = 2405.98 MHz
Etc.
The microNode uses a 26 MHz reference clock for processing and for the direct conversion
radio. It has been found that 26 MHz harmonics can create strong tones that cause some RF
sensitivity degradation on these harmonic channels.
93*26 MHz = 2418 MHz. This affects channel 9.
94*26 MHz = 2444 MHz. This affects channel 22.
95*26 MHz = 2470 MHz. This affects channel 35.
System integrators should NOT use these 3 channels as microNode RX sensitivity can be
degraded by a nominal 3-10 dB.
Refer to On-Ramp Wireless Issues #2319 and #2616.