Test Report

FCC ID: GQ4-34R

Test Report

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FCCID_458376

The University of Michigan Radiation Laboratory 3228 EECS Building Ann Arbor, MI 48109-2122 Tel: (734) 764-0500 Measured Radio Frequency Emissions From TRW Receiver Model: 500N Report No. 415031-212 August 5, 2004 Copyright © 2004 For: TRW Inc. 24175 Research Drive Farmington Hills, MI 48335-2642 Contact: Keith Fraley Tel: (248) 442-5290 Fax: (248) 553-1480 PO: Verbal Tests supervised by: Measurements made by: Report approved by: _____________________ Edward Courtney Valdis V. Liepa Research Scientist Summary Tests for compliance with FCC Regulations Part 15, Subpart B, and Industry Canada RSS-210, were performed on TRW model 500N. This device is subject to the Rules and Regulations as a Receiver. As a Digital Device it is exempt, but such measurements were made to assess the receiver's overall emissions. In testing completed on May 6, 2004, the device tested in the worst case met the allowed FCC (Class B) specifications for radiated emissions by 11.8 dB (see p. 6). The conducted emissions tests do not apply, since the device is powered from a 12 VDC system.

1. Introduction TRW model 500N was tested for compliance with FCC Regulations, Part 15, adopted under Docket 87- 389, April 18, 1989, and with Industry Canada RSS-210, Issue 5, November, 2001. The tests were performed at the University of Michigan Radiation Laboratory Willow Run Test Range following the procedures described in ANSI C63.4-1992 "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). 2. Test Procedure and Equipment Used The pertinent test equipment commonly used in our facility for measurements is listed in Table 2.1 below. The middle column identifies the specific equipment used in these tests. Table 2.1 Test Equipment. Test Instrument Eqpt. Used Manufacturer/Model Spectrum Analyzer (0.1-1500 MHz) Hewlett-Packard, 182T/8558B Spectrum Analyzer (9kHz-22GHz) X Hewlett-Packard 8593A SN: 3107A01358 Spectrum Analyzer (9kHz-26GHz) X Hewlett-Packard 8593E, SN: 3412A01131 Spectrum Analyzer (9kHz-26GHz) Hewlett-Packard 8563E, SN: 3310A01174 Spectrum Analyzer (9kHz-40GHz) Hewlett-Packard 8564E, SN: 3745A01031 Power Meter Hewlett-Packard, 432A Power Meter Anritsu, ML4803A/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 Millimeter Prod., GMA, SN: 26 S-Band Std. Gain Horn S/A, Model SGH-2.6 C-Band Std. Gain Horn University of Michigan, NRL design XN-Band Std. Gain Horn 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., U638A 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, HO5R 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) EMCO 6502, SN:2855 Ridge-horn Antenna (300-5000 MHz) X University of Michigan Amplifier (5-1000 MHz) X Avantak, A11-1, A25-1S Amplifier (5-4500 MHz) X Avantak Amplifier (4.5-13 GHz) Avantek, AFT-12665 Amplifier (6-16 GHz) Trek Amplifier (16-26 GHz) Avantek LISN Box University of Michigan Signal Generator X Hewlett-Packard 8657B 3. Configuration and Identification of Device Under Test 2

The DUT is a superheterodyne receiver, designed for onboard automobile security/convenience applications, and as such, it is powered from an automotive 12 VDC source. It is housed in a plastic case approximately 2 by 2.5 by 1 inches; antenna is internal. For testing, a generic harness was provided by the manufacturer. The VCO in the onboard RFIC (based from a 10.178 MHz reference) operates at 651.4 MHz; the LO is 325.7 MHz. In the receiver digital section, the decoding, signal processing, etc. are performed by a microprocessor timed by an 8.0127 MHz oscillator. The DUT was designed by TRW Inc., 24175 Research Drive, Farmington Hills, MI 48335-2642. It is identified as: TRW Inc. Receiver Model: 500N FCC ID: GQ4-34R IC: 1470A-6R 3.1 Modifications Made There were no modifications made to the DUT by this laboratory. 4. Emission Limits The DUT tested falls under Part 15, Subpart B, "Unintentional Radiators". The pertinent test frequencies, with corresponding emission limits, are given in Tables 4.1 and 4.2 below. 4.1 Radiated Emission Limits Table 4.1. Radiated Emission Limits (Ref: 15.33, 15.35, and 15.109). 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: Quasi-Peak readings apply to 1000 MHz (120 kHz BW) Average readings apply above 1000 MHz (1 MHz BW) 4.2 Conducted Emission Limits Table 4.3 Conducted Emission Limits (FCC:15.107 (CISPR); IC: RSS-210, 6.6). 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 4.3 Antenna Power Conduction Limits Ref: 15.111(a). Pmax = 2 nW; for frequency range see Table 4.1. 3

5. Emission Tests and Results NOTE: Even though the FCC and/or Industry Canada specify that both the radiated and conductive emissions be measured using the Quasi-Peak and/or average detection schemes, we normally use peak detection since especially the Quasi-Peak is cumbersome to use with our instrumentation. In case the measurement fails to meet the limits, or the measurement is near the limit, it is re-measured using appropriate detection. We note, that since the peak detected signal is always higher or equal to the Quasi- Peak or average detected signal, the margin of compliance may be better, but not worse, than indicated in this report. The type of detection used is indicated in the data table, Table 5.1. 5.1 Anechoic Chamber Radiated Emission Tests To familiarize with the radiated emission behavior of the DUT, it was studied and measured in the shielded anechoic chamber. In the chamber there is a set-up similar to that of an outdoor 3-meter site, with turntable, antenna mast, and a ground plane. Instrumentation includes spectrum analyzers and other equipment as needed. To study and test for radiated emissions, the DUT was powered by a laboratory power supply at 12 VDC. A MHz CW signal was injected (radiated) from a nearby signal generator using a short wire antenna. The DUT was taped to a Styrofoam block and placed on the test table on each of the three axis. At each orientation, the table was rotated to obtain maximum signal for vertical and horizontal emission polarizations. This sequence was repeated throughout the required frequency range. In the chamber we studied and recorded all the emissions using a ridge-horn antenna, which covers 200 MHz to 5000 MHz, up to 2 GHz. In scanning from 30 MHz to 2.0 GHz, there were no spurious emissions observed other than the LO and injection signal (315 MHz), and the LO harmonics. Figures 5.1 and 5.2 show emissions measured 0-1000 MHz and 1000-2000 MHz, respectively. These measurements are made with a ridge-horn antenna at 3m, with spectrum analyzer in peak hold mode and the receiver rotated in all orientations. The measurements up to 1000 MHz (Fig. 5.1) are used for initial evaluation only, while those above 1000 MHz (Fig. 5.2) are used in final assessment for compliance. 5.2 Open Site Radiated Emission Tests The DUT was then moved to the 3 meter Open Field Test Site where measurements were repeated up to 1000 MHz using a small Bicone, or dipoles when the measurement is near the limit. The DUT was exercised as described in Sec. 5.1 above. The measurements were made with a spectrum analyzer using 120 kHz IF bandwidth and peak detection mode, and, when appropriate, using Quasi-Peak or average detection (see 5.0). Some times lower IF bandwidth is used to help bring signals out of noise and this is noted in the data table. Photographs included in this filing show the DUT on the Open Area Test Site (OATS). The emissions from digital circuitry were measured using a standard Bicone. These results are also presented in Table 5.1. 4

5.3 Computations and Results for Radiated Emissions To convert the dBm's measured on the spectrum analyzer to dB(µV/m), we use expression E3(dBµV/m) = 107 + PR+ KA - KG where PR = power recorded on spectrum analyzer, dB, measured at 3m KA = antenna factor, dB/m KG = pre-amplifier gain, including cable loss, dB 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 the DUT meets the limit by 11.8 dB. 5.4 Conducted Emission Tests These tests do not apply, since the DUT is powered from a 12 VDC system. 6. Other Measurements 6.1 Emission Spectrum Near Fundamental Near operating frequency the emission spectrum is measured typically over 50 MHz span with and without injection signal. These data are taken with the DUT close to antenna and hence amplitudes are relative. The plots are shown in Figure 6.1. 6.2 Effect of Supply Voltage Variation The DUT has been designed to operate from 12 VDC power. Using a spectrum analyzer, relative radiated emissions were recorded at 651.4 MHz as voltage was varied from 7.0 to 18.0 VDC. Figure 6.2 shows the emission variation. 6.3 Operating Voltage and Current V = 12.3 VDC I = 1.2 mADC The University of Michigan Radiation Laboratory 3228 EECS Building Ann Arbor, Michigan 48109-2122 (734) 764-0500 5

Table 5.1 Highest Emissions Measured Radiated Emission - RF TRW RX; FCC Freq. Ant. Ant. Pr Det. Ka Kg E3 E3lim Pass # MHz Used Pol. dBm Used dB/m dB dBµV/m dBµV/m dB Comments 1 325.7 Sbic H -88.5 Pk 19.2 20.6 17.1 46.0 28.9 max of all, noise 2 325.7 Sbic V -91.2 Pk 19.2 20.6 14.4 46.0 31.6 max of all, noise 3 651.4 Sbic H -81.2 Pk 25.5 18.8 32.5 46.0 13.5 max of all, noise; 10 kHz 4 651.4 Sbic V -79.5 Pk 25.5 18.8 34.2 46.0 11.8 max of all, noise; 10 kHz 5 977.1 Sbic H -98.3 Pk 29.2 16.6 21.3 54.0 32.7 max of all, noise; 10 kHz 6 977.1 Sbic V -97.5 Pk 29.2 16.6 22.1 54.0 31.9 max of all, noise; 10 kHz 7 1302.8 Horn H -72.0 Pk 20.6 28.0 27.6 54.0 26.4 max. of all, noise 8 1628.5 Horn H -71.0 Pk 21.0 28.1 28.9 54.0 25.1 max. of all, noise 9 1954.2 Horn H -71.0 Pk 21.3 28.3 29.0 54.0 25.0 max. of all, noise 10 11 12 13 14 15 16 17 18 19 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. 5/6/2004; U of Mich. 6

Figure 5.1. Emissions measured at 3 meters in anechoic chamber, 0-1000 MHz. (top) Receiver plus ambient (bottom) Ambient 7

Figure 5.2. Emissions measured at 3 meters in anechoic chamber, 1000-2000 MHz. (top) Receiver plus ambient (bottom) Ambient 8

Figure 6.1. Relative receiver emissions in stand-by and activated modes. The final emission measurements were made with the receiver in activated mode. -40.0 -41.0 Relative Amplitude (dB -42.0 -43.0 -44.0 -45.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 Relative Voltage (V) Figure 6.2. Relative emission at "fundamental" vs. supply voltage. 9


Document Created: 2004-08-05 14:01:08
Document Modified: 2004-08-05 14:01:08
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