test report

FCC ID: GQ4-47T

Test Report

Download: PDF
FCCID_1550137

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 The University of Michigan Radiation Laboratory 3228 EECS Building Ann Arbor, MI 48109-2122 Tel: (734) 764-0500 Fax: (734) 647-2106 Measured Radio Frequency Emissions From TRW Inc. Transmitter FCC ID: GQ4-47T IC: 1470A-28T Test Report No. 417124-611 September 23, 2011 Copyright © 2011 For: TRW Inc. 24175 Research Drive Farmington Hills, MI 48335-2642 Contact: Jeff Rochette jeffrochette@trw.com Phone: (248) 699-4235 Fax: (248) 699-4241 Testing supervised by: Measurements made by: Valdis V. Liepa Report Approved by:__________________________ Valdis V. Liepa Test report written by: Joseph D. Brunett Research Scientist Summary Tests for compliance with FCC Regulations, CFR 47, Part 15 and with Industry Canada RSS-210/Gen, were performed on a TRW, FCC ID: GQ4-47T, IC: 1470A-28T. This device under test (DUT) is subject to the rules and regulations as a Transmitter. In testing completed on July 8, 2011, the DUT tested met the allowed specifications for radiated emissions by 7.6 dB. Conducted emissions are not subject to regulation as the DUT is powered by a 3 VDC battery. Page 1 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Table of Contents 1. Introduction ...................................................................................................................................... 3 2. Equipment Used ............................................................................................................................... 3 3. Device Under Test ........................................................................................................................... 4 3.1 Description & Block Diagram .............................................................................................. 4 3.2 Variants & Samples .............................................................................................................. 4 3.3 Modes of Operation .............................................................................................................. 4 3.4 Exemptions ........................................................................................................................... 4 3.5 EMC Relevant Modifications ............................................................................................... 4 4. Emissions Limits.............................................................................................................................. 5 4.1 Radiated Emissions Limits.................................................................................................... 5 5. Measurement Procedures ................................................................................................................. 6 5.1 Semi-Anechoic Chamber Radiated Emissions...................................................................... 6 5.2 Outdoor Radiated Emissions ................................................................................................. 6 5.3 Radiated Field Computations ................................................................................................ 6 5.4 Indoor Power Line Conducted Emissions ............................................................................. 6 5.5 Supply Voltage Variation...................................................................................................... 7 6. Test Results ...................................................................................................................................... 7 6.1 Radiated Emissions ............................................................................................................... 7 6.1.1 Correction for Pulse Operation ......................................................................................... 7 6.1.2 Emission Spectrum ........................................................................................................... 7 6.1.3 Emission Bandwidth ......................................................................................................... 7 6.1.4 Supply Voltage and Supply Voltage Variation ................................................................. 7 6.2 Conducted Emissions ............................................................................................................ 7 Page 2 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 1. Introduction This TRW Transmitter was tested for compliance with FCC Regulations, Part 15, adopted under Docket 87-389, April 18, 1989 as subsequently amended, and with Industry Canada RSS-210/Gen, Issue 8, December 2010. Tests were performed at the University of Michigan Radiation Laboratory Willow Run Test Range following the procedures described in ANSI C63.4-2003 "Methods of Measurement of Radio- Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz". The Site description and attenuation characteristics of the Open Site facility are on file with FCC Laboratory, Columbia, Maryland (FCC Reg. No: 91050) and with Industry Canada, Ottawa, ON (File Ref. No: IC 2057A-1). 2. Equipment Used The test equipment commonly used in our facility is listed in Table 2.1. Except where indicated as a pre- test, monitoring, or support device; all equipment listed below is a part of the University of Michigan Radiation Laboratory (UMRL) quality system. This quality system has been established to ensure all equipment has a clearly identifiable classification, calibration expiry date, and that all calibrations are traceable to national standards. Table 2.1 Test Equipment. Test Instrument Used Manufacturer/Model Q Number Spectrum Analyzer (9kHz-26GHz) Hewlett-Packard 8593E, SN: 3412A01131 HP8593E1 Spectrum Analyzer (9kHz-6.5GHz) Hewlett-Packard 8595E, SN: 3543A01546 JDB8595E Power Meter Hewlett-Packard, 432A HP432A1 Harmonic Mixer (26-40 GHz) Hewlett-Packard 11970A, SN: 3003A08327 HP11970A1 Harmonic Mixer (40-60 GHz) Hewlett-Packard 11970U, SN: 2332A00500 HP11970U1 Harmonic Mixer (75-110 GHz) Hewlett-Packard 11970W, SN: 2521A00179 HP11970W1 Harmonic Mixer (140-220 GHz) Pacific Millimeter Prod., GMA, SN: 26 PMPGMA1 S-Band Std. Gain Horn S/A, Model SGH-2.6 SBAND1 C-Band Std. Gain Horn University of Michigan, NRL design CBAND1 XN-Band Std. Gain Horn University of Michigan, NRL design XNBAND1 X-Band Std. Gain Horn S/A, Model 12-8.2 XBAND1 X-band horn (8.2- 12.4 GHz) Narda 640 XBAND2 X-band horn (8.2- 12.4 GHz) Scientific Atlanta , 12-8.2, SN: 730 XBAND3 K-band horn (18-26.5 GHz) FXR, Inc., K638KF KBAND1 Ka-band horn (26.5-40 GHz) FXR, Inc., U638A KABAND1 U-band horn (40-60 GHz) Custom Microwave, HO19 UBAND1 W-band horn(75-110 GHz) Custom Microwave, HO10 WBAND1 G-band horn (140-220 GHz) Custom Microwave, HO5R GBAND1 Bicone Antenna (30-250 MHz) University of Michigan, RLBC-1 LBBIC1 Bicone Antenna (200-1000 MHz) University of Michigan, RLBC-2 HBBIC1 Dipole Antenna Set (30-1000 MHz) University of Michigan, RLDP-1,-2,-3 UMDIP1 Dipole Antenna Set (30-1000 MHz) EMCO 3121C, SN: 992 (Ref. Antennas) EMDIP1 Active Rod Antenna (30 Hz-50 MHz) EMCO 3301B, SN: 3223 EMROD1 Active Loop Antenna (30 Hz-50 MHz) EMCO 6502, SN:2855 EMLOOP1 Ridge-horn Antenna (300-5000 MHz) University of Michigan UMRH1 Amplifier (5-1000 MHz) Avantek, A11-1, A25-1S AVAMP1 Amplifier (5-4500 MHz) Avantek AVAMP2 Amplifier (4.5-13 GHz) Avantek, AFT-12665 AVAMP3 Amplifier (6-16 GHz) Trek TRAMP1 Amplifier (16-26 GHz) Avantek AVAMP4 LISN Box University of Michigan UMLISN1 Signal Generator Hewlett-Packard 8657B HPSG1 Page 3 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 3. Device Under Test 3.1 Description & Block Diagram The DUT is a 315 MHz Transmitter designed for automotive/vehicular applications. It is powered by a 3 VDC lithium battery and is housed in a plastic case approximately 7 x 6 x 2 cm in dimension. The DUT is potted and permanently affixed in the wheel of a tire. The DUT is designed and manufactured by TRW Inc., 24175 Research Drive, Farmington Hills, MI 48335-2642. Device [Make], Model [S/N],P/N EMC Consideration DUT [TRW], 225816-104 [EMC1] Normal Mode DUT [TRW], 225816-104 [EMC2] CW Mode DUT [TRW], 225816-104 [EMC3] Unpotted (photos + voltage variation) 3.2 Variants & Samples There is only a single variant of this device. Three samples were provided for testing, one normal sample, one capable of CW transmission, and one un-potted for photographs and voltage variation. 3.3 Modes of Operation The DUT periodically transmits tire pressure data. The device is also capable of being automatically actuated (via LF interrogation) either by in-vehicle LF initiators or by trained personnel during servicing. Per FCC correspondence, service modes fall under FCC part 15.231(a)(5). Figure 6.1 demonstrates compliance with both 15.231(a)(2) and (5). A detailed list of all operating modes is included in the Description of Operation exhibit. 3.4 Exemptions The DUT is permanently installed in a transportation vehicle. As such, digital emissions are exempt from regulation (per FCC 15.103(a) and IC correspondence on ICES-003). The DUT employs some modes of operation that alert the vehicle user of sudden changes in tire pressure. Such alert modes fall under FCC 15.231(a)(4), and may operate during the pendency of the alarm condition. 3.5 EMC Relevant Modifications No EMI Relevant Modifications were performed by this test laboratory. Page 4 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 4. Emissions Limits 4.1 Radiated Emissions Limits The DUT tested falls under the category of an Intentional Radiator. The applicable testing frequencies and corresponding emission limits set by both the FCC and IC are given in Tables 4.1 and 4.2 below. Table 4.1. TX Emission Limits (FCC: 15.231(e), .205(a); IC: RSS-210 2.7 T5). Fundamental Spurious** Frequency Ave. Elim (3m) Ave. Elim (3m) (MHz) (µV/m) dB (µV/m) (µV/m) dB (µV/m) 260.0-470.0 1500-5000* 150-500 315.0 2417 67.7 241.7 47.7 433.9 4399 72.9 439.9 52.9 322-335.4 Restricted 399.9-410 200 46.0 Bands 608-614 960-1240/1427(IC) 1300-1427 1435-1626.5 Restricted 1645.5-1646.5 (IC) 500 54.0 Bands 1660-1710 1718.9-1722.2 2200-2300 * Linear interpolation, formula: E = -2833.2 + 16.67*f (MHz) ** Measure up to tenth harmonic; 120 kHz BW up to 1 GHz, 1 MHz BW above 1 GHz Table 4.2. Spurious Emission Limits (FCC: 15.33, .35, .109/209; IC: RSS-210 2.7, T2) Freq. (MHz) Elim (3m) µV/m Elim dB(µV/m) 30-88 100 40.0 88-216 150 43.5 216-960 200 46.0 960-2000 500 54.0 Note: Average readings apply above 1000 MHz (1 MHz BW), Quasi-Peak readings apply to 1000 MHz (120 kHz RBW), PRF of intentional emissions > 20 Hz for QPK to apply. Power Line Conducted Emissions Limits Table 4.3 Emission Limits (FCC:15.107 (CISPR); IC: RSS-Gen, 7.2.2 T2). Frequency Class A (dBµV) Class B (dBµV) (MHz) Quasi-peak Average Quasi-peak Average .150 - 0.50 79 66 66 - 56* 56 - 46* 0.50 - 5 73 60 56 46 5 - 30 73 60 60 50 Notes: 1. The lower limit shall apply at the transition frequency 2. The limit decreases linearly with the logarithm of the frequency in the range 0.15-0.50 MHz: *Class B Quasi-peak: dBµV = 50.25 - 19.12*log( f ) *Class B Average: dBµV = 40.25 - 19.12*log( f ) 3. 9 kHz RBW Page 5 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 5. Measurement Procedures 5.1 Semi-Anechoic Chamber Radiated Emissions To become familiar with the radiated emission behavior of the DUT, the device is first studied and measured in our shielded semi-anechoic chamber. In the chamber there is a set-up similar to that of an outdoor 3-meter site, with a turntable, an antenna mast, and a ground plane. Instrumentation includes spectrum analyzers and other equipment as needed. The DUT is laid on the test table as shown in the included block diagram and/or photographs. A shielded loop antenna is employed when studying emissions from 9 kHz to 30 MHz. Above 30 MHz and below 250 MHz a biconical antenna is employed. Above 250 MHz a ridge or and standard gain horn antennas are used. The spectrum analyzer resolution and video bandwidths are set so as to measure the DUT emission without decreasing the emission bandwidth (EBW) of the device. Emissions are studied for all orientations (3-axes) of the DUT and all test antenna polarizations. In the chamber, spectrum and modulation characteristics of intentional carriers are recorded. Receiver spurious emissions are measured with an appropriate carrier signal applied. Associated test data is presented in subsequent sections. 5.2 Outdoor Radiated Emissions After measurements are performed indoors, emissions on our outdoor 3-meter Open Area Test Site (OATS) are made, when applicable. If the DUT connects to auxiliary equipment and is table or floor standing, the configurations prescribed in ANSI C63.4 are employed. Alternatively, an on-table layout more representative of actual use may be employed if the resulting emissions appear to be worst-case in such a configuration. Any intentionally radiating elements are placed on the test table flat, on their side, and on their end (3-axes) and worst case emissions are recorded. For each configuration the DUT is rotated 360 degrees about its azimuth and the receive antenna is raised and lowered between 1 and 4 meters to maximize radiated emissions from the device. Receiver spurious emissions are measured with an appropriate carrier signal applied. For devices with intentional emissions below 30 MHz, our shielded loop antenna at a 1 meter receive height is used. Low frequency field extrapolation to the regulatory limit distance is employed as needed. Emissions between 30 MHz and 1 GHz are measured using tuned dipoles and/or biconical antennas. Care is taken to ensure that the RBW and VBW used meet the regulatory requirements, and that the EBW of the DUT is not reduced. The Photographs included in this report show the Test Setup. 5.3 Radiated Field Computations To convert the dBm values measured on the spectrum analyzer to dB(µV/m), we use expression E3(dBµV/m) = 107 + PR + KA - KG + KE - CF where PR = power recorded on spectrum analyzer, dBm, measured at 3 m KA = antenna factor, dB/m KG = pre-amplifier gain, including cable loss, dB KE = duty correction factor, dB CF = distance conversion (employed only if limits are specified at alternate distance), dB When presenting the data at each frequency, the highest measured emission under all of the possible DUT orientations (3-axes) is given. 5.4 Indoor Power Line Conducted Emissions When applicable, power line conducted emissions are measured in our semi-anechoic chamber. If the DUT connects to auxiliary equipment and is table or floor standing, the configurations prescribed in ANSI C63.4 are employed. Alternatively, an on-table layout more representative of actual use may be employed if the resulting emissions appear to be worst-case in such a configuration. Page 6 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 The conducted emissions measured with the spectrum analyzer and recorded (in dBµV) from 0-2 MHz and 2-30 MHz for both the ungrounded (Hi) and grounded (Lo) conductors. The spectrum analyzer is set to peak-hold mode in order to record the highest peak throughout the course of functional operation. Only when the emission exceeds or is near the limit are quasi-peak and average detection used. 5.5 Supply Voltage Variation Measurements of the variation in the fundamental radiated emission were performed with the supply voltage varied by no less than 85% and 115% of the nominal rated value. For battery operated equipment, tests were performed using a new battery, and worst case emissions are re-checked employing a new battery. 6. Test Results 6.1 Radiated Emissions 6.1.1 Correction for Pulse Operation When the transmitter is activated (either by tire motion or by single LF interrogation), transmits three different staged sets of grouped frames. These stages are depicted in Figure 6.1. Computing the duty factor for each state results in: KE1 = (2 x 8.75 ms) / 100 ms = 0.175 or -15.1 dB. KE2 = (2 x 14.00 ms) / 100 ms = 0.280 or -11.1 dB. KE3 = (3 x 8.50 ms) / 100 ms = 0.255 or -11.9 dB. The worse case condition occurs in Stage 2 and thus a -11.1 dB duty cycle is applied to the peak emissions measured when computing average field strengths. 6.1.2 Emission Spectrum The relative DUT emission spectrum is recorded and is shown in Figure 6.2. 6.1.3 Emission Bandwidth The emission bandwidth of the signal is shown in Figure 6.3. The allowed 99% bandwidth is 0.25% of 315 MHz, or 787.25 kHz. From the plot we see that the EBW is 188.0 kHz. 6.1.4 Supply Voltage and Supply Voltage Variation The DUT has been designed to be powered by a 3 VDC battery. For this test, relative radiated power was measured at the fundamental as the voltage was varied from 2.0 to 4.0 volts. The emission variation is shown in Figure 6.4. Batteries: before testing Voc = 3.2 V after testing Voc = 3.0 V Ave. current from batteries I = 6.3 mA (cw) 6.2 Conducted Emissions These tests do not apply, since the DUT is powered from a 3 VDC battery. The University of Michigan Radiation Laboratory 3228 EECS Building Ann Arbor, MI 48109-2122 Tel: (734) 764-0500 Fax: (734) 647-2106 Page 7 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Table 6.1 Highest Emissions Measured Radiated Emission - RF TPM TRW TPM HKMC (8003F9BF); FCC/IC Freq. Ant. Ant. Pr Det. Ka Kg E3 E3* E3lim Pass # MHz Used Pol. dBm Used dB/m dB dBµV/m dBµV/m dB Comments 1 315.0 Dip H -34.4 Pk 18.6 21.1 59.0 67.7 8.7 flat 2 315.0 Dip V -38.7 Pk 18.6 21.1 54.7 67.7 13.0 end 3 630.0 Dip H -62.2 Pk 24.4 18.0 40.0 47.7 7.6 flat 4 630.0 Dip V -62.2 Pk 24.4 18.0 40.0 47.7 7.6 end 5 945.0 Dip H -78.0 Pk 28.8 16.0 30.7 47.7 17.0 noise, max all 6 945.0 Dip V -78.5 Pk 28.8 16.0 30.2 47.7 17.5 noise, max all 7 1260.0 Horn H -65.4 Pk 20.6 28.1 23.0 54.0 31.0 flat 8 1575.0 Horn H -57.1 Pk 21.5 28.1 32.2 54.0 21.8 flat 9 1890.0 Horn H -67.6 Pk 22.2 28.1 22.4 54.0 31.6 flat 10 2205.0 Horn H -72.2 Pk 23.0 26.5 20.2 54.0 33.8 noise, max all 11 2520.0 Horn H -71.6 Pk 23.9 26.0 22.2 54.0 31.8 noise, max all 12 2835.0 Horn H -72.6 Pk 24.8 24.7 23.4 54.0 30.6 noise, max all 13 3150.0 Horn H -72.0 Pk 25.8 23.6 26.1 54.0 27.9 noise, max all 14 15 16 17 18 19 * Includes 11.1 dB duty factor 20 21 22 Digital emissions more than 20 dB below FCC/IC Class B Limit. 23 24 25 26 27 Conducted Emissions Freq. Line Det. Vtest Vlim Pass # MHz Side Used dBµV dBµV dB Comments Not applicable Meas. July 6, 2011; U of Mich. Page 8 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Figure 6.1(a). LF Activated / Stage 1 FSK Transmission characteristics. (top) complete transmission, (center) transmission window, (bottom) frame length. Page 9 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Figure 6.1(b). Stage 2 Transmission characteristics. (top) complete set of 8 transmissions, (center) expanded frames completed in less than 500 ms, (bottom) expanded single FSK frame. Page 10 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Figure 6.1(c) Stage 3 (Normal Periodic) Transmission characteristics. (top) periodic transmission, (center) worst case frames in 100 ms window, (bottom) single FSK frame length. Page 11 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Figure 6.2. Emission spectrum of the DUT (pulsed emission). Amplitudes are only indicative (not calibrated). Figure 6.3. Measured emission bandwidth of the DUT (pulsed). Figure 6.4. Relative emission at fundamental vs. supply voltage (pulsed). Page 12 of 13

University of Michigan Radiation Laboratory FCC Part 15, IC RSS-210/Gen - Test Report No. 417124-611 Photograph 6.5. DUT on OATS (one of three axes tested) Photograph 6.6. Close-up of DUT on OATS (one of three axes tested) Page 13 of 13


Document Created: 2011-09-26 23:11:06
Document Modified: 2011-09-26 23:11:06
© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC