October 5 th 2017 SIGFOX END- PRODUCT RADIATED TEST PLAN FOR SIGFOX READY TM CERTIFICATION Public use
Revision History Revision Number Date Author Change description 0.1 August 15 th, 2017 B.Ray Initial spec 0.2 October 5 th, 2017 B.Ray Antenna gain in db Content I. Introduction... 4 1. Acronyms and abbreviations... 4 2. Scope... 4 3. Definitions... 5 II. TX Test Setup... 7 1. ERP or EIRP... 8 2. Radiation pattern... 9 III. RX Test setup (optional)... 11 1. RX radiated sensitivity (optional)... 11 APPENDIX A... 13 APPENDIX B... 14 APPENDIX C... 15 2
1. Introduction
I. Introduction 1. Acronyms and abbreviations - CE: European Commission - CW: Continuous wave - DUT: Device Under Test - EIRP: Effective Isotropic Radiated Power - ETSI: European Telecommunications Standards Institute - ERP: Effective Radiated Power - FCC: Federal Communications Commission - GFSK: Gaussian Frequency Shift Keying - RC: Radio Configuration - RF: Radio Frequency - RX: Receive - TX: Transmit 2. Scope This document applies to Sigfox partners planning the radiated tests of the Sigfox Ready TM Certification for an end-product. Radiated tests will be performed by Sigfox accredited laboratories. Filing is checked by Sigfox through the BUILD platform. This document intents to describe the test setup and test procedure for each radiated test being performed for the Sigfox Ready TM certification. Throughout this document, the Device under Test (DUT) refers to the product to be certified. Important: The Sigfox Ready TM certification for end product does not substitute local regulatory requirements (CE marking, FCC, ETSI or other type approval) where the End Product is to be deployed. It is the partner`s responsibility to comply with local country regulations. 4
3. Definitions The effective radiated power (ERP) is the power radiated in the direction of maximum field strength under specified conditions of measurements. ERPdBm= Conducted_RF_PowerdBm + Antenna_GaindB EIRP refers to an isotropic antenna whereas ERP refers to a perfect dipole antenna. The relation between ERP and EIRP is: EIRPdBm = ERPdBm + 2.15dB The radiation pattern is the variation of the power radiated by an antenna as a function of the direction away from the antenna. This power variation, as a function of the arrival angle, is observed in the antenna s far field. Radiated receiver sensitivity is the minimum level of signal at the receiver input, produced by a carrier at the nominal frequency of the receiver, modulated with the normal test signal modulation. EIRP and radiation pattern tests are mandatory for Sigfox Ready TM filing. The receiver sensitivity test is optional but highly recommended. It only applies to DUT operating in bidirectional communication way. 5
2. TX Test Setup
II. TX Test Setup Measurements shall be carried out under normal conditions (temperature, humidity, pressure) in the following test sites: Open Area Test Site (OATS) Semi Anechoic Room (SAR) Or Fully Anechoic room (FAR) Figure 1 Fully Anechoic room (FAR) Coordinate system anechoic chamber (OTA) can also be used for testing. 7
Figure 2 Coordinate system anechoic chamber (OTA) Measurement antenna is connected to a spectrum analyzer The chamber and the cable loss must be calibrated at least up to 1GHz. 1. ERP or EIRP Test procedure: DUT is activated with CW TX test mode (non-modulated Continuous Wave mode) at dedicated RC frequency test (see Appendix C) and maximum power For RC1 and RC3 maximum ERP (Effective Radiated Power) is measured and recorded following the ETSI EN 300-220 (2017-02) standard test procedure whereas for RC2 and RC4, maximum EIRP (Effective Isotropic Radiated Power) is measured and recorded following the FCC Part15-247 standard. During measurement, DUT shall be placed in normal use position as declared by the provider For multi-position end-product, the DUT EIRP measurement can be performed in 3 dimensions if needed 8
2. Radiation pattern Test procedure: DUT is activated with CW TX test mode (non-modulated Continuous Wave mode) at dedicated RC frequency test and power Radiated power is recorded for every 5 step of the turn table in vertical and horizontal polarization The radiation pattern in vertical and horizontal polarization shall be derived from the DUT where maximum EIRP occurs. It shall be normalized to maximum EIRP value and represented in polar coordinates. The measurement unit is dbm For multi-position DUT, the radiation pattern measurement can be performed in 3 dimensions if needed For multi-position DUT, the angular position step (azimuth) shall be equal or less than 5 and the tilt position step (elevation) shall be equal or less than 10 Example of radiation patterns are provided in Appendix A 9
3. RX Test Setup (optional)
III. RX Test setup (optional) Measurements shall be carried out under normal conditions (temperature, humidity, pressure) in the same kind of room as the TX radiated tests. 1. RX radiated sensitivity (optional) The receiver sensitivity test is optional but highly recommended. It only applies to DUT operating in bidirectional communication way. Two test setups are described depending on the test house available equipment. Test setup 1: Anechoic chamber without spy antenna 11
Test setup 2: Anechoic chamber with spy antenna Test procedure: DUT is oriented in the position of max EIRP found in the TX EIRP test above DUT is activated in infinite loop RX GFSK test mode Generator is set in emission: o output power: -50dBm. Path loss and cable loss must be taken into account o F1 frequency: downlink frequency is set according to RC test frequency o Modulation: GFSK. See full generator modulation parameters in appendix B. Spectrum analyzer is set to the frequency F2=F1-50kHz corresponding to the packet sent by the DUT when receiving the GFSK signal Note that the DUT usually embeds a RX narrow filter. To find reception window, frequency must be shift by step of 1kHz. Once reception window found, it must be set to the center frequency between the 2 cutoff frequencies F2 frequency is tracked on the spectrum analyzer in span 0hz and sweep time is adjusted to allow easy counting of the F2 frames Lower the signal generator level until the communication is lost (no packet sent from the device) Increase the generator level by 3dB and lower again by step of 0.1dB until the sensitivity test requirement is met 12
APPENDIX A Radiation pattern in both polarization Horizontal and Vertical Radiation pattern in coordinate system anechoic chamber 13
APPENDIX B Signal Generator GFSK parameters: o For SMIQ Signal Generator from R&S DATA LIST: AA AA B2 27 1F 20 41 84 32 68 C5 BA 53 AE 79 E7 F6 DD 9B o For SMBV100A Signal Generator from R&S In «baseband», go to custom digital modulation and enter following parameters: - Adjsut freq and power level - Create a data_list with following pattern: AA AA B2 27 1F 20 41 84 32 68 C5 BA 53 AE 79 E7 F6 DD 9B - No control list - symbol rate = 600 symb/s - coding off - modulation type = 2FSK - deviation = 800 Hz - filter = Gauss(FSK) and B*T = 0.35 14
APPENDIX C CW test frequency versus RC: RC RC1 RC2 RC3 RC4 CW test frequency in uplink 868.13MHz 902.2MHz 923.2MHz 920.8MHz 15