Test Report

FCC ID: KOBDR04A

Test Report

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FCCID_310814

The University of Michigan Radiation Laboratory 3228 EECS Building Ann Arbor, MI 48109—2122 Tel: (734) 764—0500 | Measured Radio Frequency Emissions From Lear Daimler—Chrysler Skreem Immobilizer HB and LX Series Report No. 415031—158 March 5, 2003 Copyright © 2003 For: Lear Corporation 5200 Auto Club Drive Dearborn, Michigan 48126—9982 Contact: Jason Summerford e—mail; jsummerford@lear.com Tel: 313—593—9293 Fax: 313—240—9306 PO: verbal Tests supervised by: //dgég Measurements made by: Valdis Liepa Report approved by: L Valdis V. Liepa Research Scientist Summary Tests for compliance with FCC Regulations, Part 15, Subpart C, and for compliance with Industry Canada RSS—210, were performed on Lear Skreem HB and LX Immobilizer. This device is subject to Rules and Regulations as a transmitter. As a digital device it is exempt. In testing performed November 4, 2002, the device tested in the worst case met the allowed specifications for transmitter radiated emissions by 38.4 dB (see p. 6). The conductive emission tests do not apply, since the device is powered from an automotive 12—volt battery.

a 1. Introduction Lear Skreem Immobilizer was tested for compliance with FCC Regulations, Part 15, adopted under Docket §$7—389, April 18, 1989, and with Industry Canada RSS—210, Issue 5, dated February 14, 1998. The tests were performed at the University of Michigan Radiation Laboratory Willow Run Test Range following the procedures described in ANSI C€63.4—1992 "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 2057). . 1 . 2. Test Procedure and Equipment Use The test equipment commonly used in our facility is listed in Table 2.1 below. The second column identifies the specific equipment used in these tests. The HP 8593E spectrum analyzer is used for primary amplitude and frequency reference. Table 2.1. Test Equipment. Test Instrument Eqpt Used Manufacturer/Model Spectrum Analyzer (0.1—1500 MHz) Hewlett—Packard, 182T/8558B Spectrum Analyzer (IkHz—22GHz) X Hewlett—Packard $593¥A SN: 3107A01358 Spectrum Analyzer (OkHz—26GHz) X Hewlett—Packard 8§593E, SN: 3412A01131 Spectrum Analyzer (OkHz—26GHz) Hewlett—Packard $563E, SN:; 3310A01174 Spectrum Analyzer (OkHz—40GHz) Hewlett—Packard 8564E, SN: 3745¥01031 Power Meter Hewlett—Packard, 432A Power Meter Anritsu, MLA48O03A/MP Harmonic Mixer (26—40 GHz) Hewlett—Packard 11970A, SN: 3003A08327 Harmonic Mixer (40—60 GHz) Hewlett—Packard 11970U, SN: 2332A00500 Harmonic Mixer (75—110 GHz) Hewlett—Packard 11970W, SN: 2521A00179 Harmonic Mixer (140—220 GHz) Pacific Millimiter Prod., GMA, SN: 26 S—Band Std. Gain Hormm S/A, Model SGH—2.6 C—Band Std. Gain Horn University of Michigan, NRL design XN—Band Std. Gain Hom University of Michigan, NRL design X—Band Std. Gain Horn S/A, Model 12—8.2 X—band horn (8.2— 12.4 GHz) Narda 640 X—band horn (8.2— 12.4 GHz) Scientific Atlanta , 12—8.2, SN: 730 K—band horn (18—26.5 GHz) FXR, Inc., K638KF Ka—band horn (26.5—40 GHz) FXR, Inc., U6®38A U—band horn (40—60 GHz) Custom Microwave, HO19 W—band horn(75—110 GHz) Custom Microwave, HO10 G—band horn (140—220 GHz) Custom Microwave, HOSR Bicone Antenna (30—250 MHz) X University of Michigan, RLBC—1 Bicone Antenna (200—1000 MHz) X University of Michigan, RLBC—2 Dipole Antenna Set (30—1000 MHz) University of Michigan, RLDP—1,—2,—3 Dipole Antenna Set (30—1000 MHz) EMCO 2131C, SN: 992 Active Rod Antenna (30 Hz—50 MHz) EMCO 3301B, SN: 3223 Active Loop Antenna (30 Hz—50 MHz) X EMCO 6502, SN: 2855 Ridge—horm Antenna (300—5000 MHz) University of Michigan Amplifier (5—1000 MHz) Avantak, A11—1, A25—18 Amplifier (5—4500 MHz) Avantak Amplifier (4.5—13 GHz) Avantek, AFT—12665 Amplifier (6—16 GHz) Trek Amplifier (16—26 GHz) Nee Avantek LISN (50 uH) University of Michigan Signal Generator (0.1—2060 MHz) , Hewlett—Packard, 8657B Signal Generator (0.01—20 GHz ) Hewlett—Packard

3. Configuration and Identification of Device Under Test The DUT is a car security system that electronically identifies the "real" ignition key for the car. The system tested consisted of a T/R module (including coupling coil antenna) and a "passive" transponder imbedded in the key. The transponder in the key is considered passive because it uses the energy supplied by the transmitter coil to operate its micro and, hence, is not subject to the regulations. Also the module contains a 315 MHz RKE receiver; this was tested and results reported in a separate report. The DUT was mounted on aluminum lock housing and its 0.5 m harness connected to a control/junction box. The 12—volt power supply was placed under the test table. A remote laptop was connected to the junction box to put the DUT in appropriate test mode. The DUT was designed and manufactured by Lear Corporation, 5200 Auto Club Drive, Dearborn, MI 48 126. It is identified as: Lear Skreem Immobilizer DCX P/N: 56038675AH (HB), 56038665AG (LX) S/N: 00336, DV2498, respectively FCC ID: KOBDRO4A IC: 3521 A—RO4B The HB and LX versions use the same PCB and electronics. Differences are only in plastic and lock housings. The HB version was tested completely; for LX version only the fundamental emission was measured. 3.1 EMI Relevant Modifications None. 4. Emission Limits 4.1 Radiated Emission Limits The DUT tested falls under the category of an Intentional Radiators and the Digital Devices, subject to Subpart C, Section 15.209; and Subpart B, Section 15.109 (transmitter generated signals excluded); and Subpart A, Section 15.33. The applicable testing frequencies with corresponding emission limits are given in Tables 4.1 and 4.2 below. As a digital device, it is exempt. Table 4.1. Radiated Emission Limits (FCC: 15.205, 15.35; IC: RSS—210 (6.2.2(r), 6.3)). (Transmitter) Fundamental Frequency and Spurious* (MHz) (uV/m) 0.009—0.490 2400/F(kHz), 300m 0.490—1.705 24,000/F(kHz), 3Om 0.090—0.110 Restricted 0.49—0.5 1 Bands * Harmonics must be below the fundamental. For extrapolation to other distances, see Section 6.6.

Table 4.2. Radiated Emission Limits (FCC: 15.33, 15.35, 15.109; IC: RSS—210, 6.2.2(r)). (Digital Class B) Freq. (MHz) E1;, (3m) puV/m Ein dB(uV/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 BW) 4.2 Conductive Emission Limits The conductive emission limits and tests do not apply here, since the DUT is powered from an automobile 12 VDC system. 5. Radiated Emission Tests and Results 5.1 Anechonic Chamber Measurements To familiarize with the radiated emission behavior of the DUT, the DUT was first studied and measured in a shielded 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. In this case, the receiving antenna was an active loop, placed on a tripod, approximately 1.5 meters above ground. The DUT was laid on the test table as seen in the Appendix Setup Photos. Using the loop antenna we studied emissions up to 2 MHz. The spectrum analyzer resolution and video bandwidths were usually set to 1 kHz, and sometimes down to 300 Hz. Emissions were studied with the plane of the loop perpendicular and parallel to the direction of propagation from the DUT. Larger emissions were observed when the loop was perpendicular. In the chamber we also recorded the spectrum and modulation characteristics of the carrier. These data are presented in subsequent sections. In scanning from 0.0—2.0 MHz there were no spurious emissions observed other than harmonics. In some instances, it was difficult to separate the DUT emissions from AM band signals. 5.2 Outdoor Measurements After the chamber measurements, the emissions on our outdoor 3—meter site were measured. For transmitter emissions a loop antenna was used; the resolution bandwidth was usually 1 kHz. See Appendix for measurement set—up. For digital emissions bicone and dipole antennas were used. See Section 6.6 for field extrapolation of transmitter data from 3 m to 300 m. 5.3 Computations and Results To convert the dBm measured on the spectrum analyzer to dB(uV/m), we use expression E3(dBuV/m) = 107 + Pr + Ka — Kg + Kg where Pr = power recorded on spectrum analyzer, dB, measured at 3 m Ka = antenna factor, dB/m Kg = pre—amplifier gain, including cable loss, dB Kg = pulse operation correction factor, dB (see 6.1) When presenting the data, at each frequency the highest measured emission under all of the possible orientations is given. Computations and results are given in Table 5.1. There we see that as a transmitter, the DUT meets the limit by 38.4 dB.

6. Other Measurements and Computations 6.1 Correction For Pulse Operation In normal a operation the transmitter is activated when the ignition key is first turned on. The device then transmitts for about 61ms. See Figure 6.1. The averaging factor for such operation is Kg = 61 ms / 100 ms = 0.61 or —4.3 dB | 6.2 Emission Spectrum Using the loop antenna, the emission spectrum was recorded and is shown in Figure 6.2. Unfortunately, the measurement is contaminated by AM stations. 6.3 Bandwidth of the Emission Spectrum The measured spectrum of the signal is shown in Figure 6.3. From the plot we see that the —20 dB bandwidth is 22 kHz and the center requency is about 125.0 kHz. 6.4 Effect of Supply Voltage Variation The DUT has been designed to be operated from an automobile 12VDC system. For this test, the relative power radiated was measured at the fundamental as the voltage was varied from 5.3 to 18.0 volts. The emission variation is shown in Figure 6.4. 6.5 Input Voltage and Current V = 12.3 V I = 130 mA (during transmission) 6.6 Field Behavior from 125 kHz to 1.25 MHz Because at the specified 300/30 m measurement distance the signal is too small to measure, measurements were made at 3 m. To translate the measurement from 3 m to the 300/30 m distance, we computed the field behavior for a Hertzian (small loop) dipole using equations found in most antenna books, such as, Balanis Antenna Theory Analysys and Design, 1997 John Wiley & Sons, 2nd Edition, pg. 207—208. The applicable results that we need arce: Freq (kHz) H—component Extrap positions __Correction (dB) Notes 125 Radial 3m/300m 117.9 dB Axial coupling 125 Transverse 3m/300m 121.2 dB Planar coupling 250 Radial 3m/300m 114.6 dB Axial coupling 250 Transverse 3m/300m 113.4 dB Planar coupling 375 Radial 3m/300m 111.9 dB Axial coupling 375 Transverse 3m/300m 105.6 dB Planar coupling 500 Radial 3m/30m 59.6 dB Axial coupling 500 Transverse 3m/30m 60.6 dB Planar coupling 625 Radial 3m/30m 59.4 dB Axial coupling @25 Transverse 3m/30m 60.6 dB Planar coupling 750 Radial 3m/30m 59.1 dB Axial coupling 750 Transverse 3m/30m 60.8 dB Planar coupling 875 Radial 3m/30m 58.9 dB Axial coupling 875 Transverse 3m/30m 61.0 dB Planar coupling 1000 Radial 3m/30m 58.6 dB Axial coupling 1000 Transverse 3m/30m 61.2 dB Planar coupling 1125 Radial 3m/30m 58.3 dB Axial coupling 1125 Transverse 3m/30m 61.2 dB Planar coupling 1250 Radial 3m/30m 57.9 dB Axial coupling 1250 Transverse 3m/30m 61.2 dB Planar coupling In the data table, Table 5.1, the measured field is decreased by the dB values given above to represent the field at 300m or 30m, which ever is applicable. 5

Table 5.1 Highest Emissions Measured Transmitter Radiated Emissions Lear Skreem Immobilizer; FCC/IC Freq. Ant. Ant. Pr,3m Det.| Ka Kg E* Elim* Pass HB with RKE NJ MHz Used |Orien.| dBm |Used| dB/m| dB ABuV/mdBuV/m _dB Comments 1| 0.1250| Loop |V/perg —33.1 Pk 9.9 0.0 —384 25.7 64.1 |loop perp. (axis in dir. of prop.) 110.1250| Loop |V/par| —39.4 Pk 9.9 0.0 —47.9 25.7 73.6 |loop paral (loop in dir. of prop.) 1| 0.1250| Loop H —36.2 Pk 9.9 0.0 —44.7 25.7 704 |loop horiz (loop in horizontal plane) 2|0.2500| Loop [V/perp —75.2 Pk 9.8 0.0 —77.3 19.6 96.9 |noise 210.2500| Loop |V/par| —74.8 Pk 9.8 0.0 —75.7 19.6 95.3 |noise 2|0.2500| Loop H —75.8 Pk 9.8 0.0 —76.7 19.6 96.3 |noise 3| 0.3750| Loop |V/perg —67.9 Pk 9.8 0.0 —67.3 16.1 834 3]0.3750| Loop |V/par| —71.4 Pk 9.8 0.0 —6M4.5 16.1 80.6 3|0.3750| Loop H —73.6 Pk 9.8 0.0 —66.7 16.1 82.8 4|0.5000| Loop |V/perp| —80.1 Pk 9.8 0.0 —22.9 33.6 56.5 |noise 4]0.5000| Loop V/par| —79.2 Pk 9.8 0.0 —23.0 33.6 56.6 |noise 4|0.5000| Loop H —79.5 Pk 9.8 0.0 —23.3 33.6 56.9 |noise 5| 0.6250| Loop |V/perg —64.1 Pk 9.8 0.0 — 6.7 31.7 38.4 [noise, background rf 510.6250| Loop |V/par| —68.8 Pk 9.8 0.0 —12.6 31.7 44.3 |noise, background rf 5|0.6250| Loop H —67.3 Pk 9.8 0.0 — 9.6 31.7 41.3 |noise, background rf 61|0.7500| Loop All —70.2 Pk 9.8 0.0 —12.5 30.1 42.6 |noise, background rf 7| 0.8750| Loop All —88.7 Pk 9.8 0.0 —30.8 28.8 59.6 |noise 8| 1.0000| Loop All —76.5 Pk 9.8 0.0 —18.3 27.6 45.9 |noise, background rf 9| 1.1250| Loop All —73.9 Pk 9.8 0.0 —154 26.6 42.0 Inoise, background rf 10| 1.2500| Loop All —76.1 Pk 9.8 0.0 —17.2 25.7 42.9 Inoise LX with RKE 1| 0.1250| Loop |V/perg| —31.6 Pk 9.9 0.0 —36.9 25.7 62.6 |loop perp. (axis in dir. of prop.) * Averaging applies up 490 kHz, 4.3 dB in this case Limit at 300m for £<0.490MHz; 30m for £>0.490MHz Measurements made at 3m, see Sec.6.6 for extrapolation values Usually IkHz RBW used, sometimes lower to reduce ambient and instrument noise Digital Radiated Emissions, Class B Freq. Ant. Ant. Pr Det.| Ka Kg E3 E3lim Pass # MHz Used Pol. dBm |Used|dB/m| dB f{@BuV/mdBuV/m _dB Comments Meets cllass B iimit by r|nore thlan 20d}|3 Meas. 01/31/03; U of Mich.

11if9:i5& B1 JAN 2003 MKR $1.500 msec & REF 1i@.0 dBm §1T :A dgB ~&1.28 4Bm PEARK L 0S 160 ho i Je i ied uratuto t potat o deta ns 48 / —51 .8 4B m WA SB sto us CORrR CENMT SF f1 N Az 13 T k Ha VBW 19 kHz #SWP e2 80 mses Figure 6.1. Transmission modulation characteristics. £1=18:49 a1 JAN 2003 REF .09 4Bm #AT 18 dB FEAKk LOGB 6 4 4B STRART 8 Hz sTOP z.000 MHz #EES BM & .9 k Mz VBNM 3 kHz SWP ABYT msec Figure 6.2. Emission spectrum of the DUT. The amplitudes are only indicative (not calibrated).

11r24156 31 JAN 20038 x CR . 0A EEF 109 .0 dBm AT 28 dB «47 PEAK L0 16 dB . eA”f-HS“ “§?l........ 5 ......... E ......... é ......... g)““”3“”yhfiflnfim%&¥fir MA S SCoOF Sp J S flmmdfi "’u,,,,,,flnmm CuRr z . SPFAN 50@ .AB0 kHz k Hz VBW 1 kHz SWUWF 3208 msec Figure 6.3. Measured bandwidth of the DUT. (repeated pulses) —0.5 —0.7 — Relative Amplitude, dB —0.9 7 ~1.1 4 ~1.3 4 —1.5 T T * 0 10 20 Supply Voltage, VDC Figure 6.4. Relative emission at 125 kHz vs. supply voltage.

DUT on OATS Close- up on the DUT on OATS 9


Document Created: 2003-03-10 14:20:48
Document Modified: 2003-03-10 14:20:48
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