test report of 1A5247

FCC ID: HBW1A5247

Test Setup Photos

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FCCID_13622

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 COMPLIANCE TESTING OF CHAMBERLAIN 3 BUTTON REMOTE CONTROL TRANSMITTER - TEST REPORT - NOVEMBER 11, 1998 Prepared for: The Chamberlain Group Elmhurst, Illinois 60126 All results of this report relate only to the items that were tested. This report is not to be reproduced, except in full, without written approval of L.S.Compliance, Inc. LSC-Chamberlain 80232 0 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 Section Description Page # Report of Measurements: index 1 Description of Measurement Facilities 2 1.2 Signature Page 3 1.3 Summary of Test Report 4 1.4 Introduction 5 1.5 Purpose 5 1.6 Radiated Emission Test Setup 5 1.7 Radiated Emission Test Procedure 6 1.8 Radiated Emission Test Equipment Utilized 7 1.9 Conducted Emission Measurements 7 1.10 Restricted Bands (Frequencies and Limits) 8 1.11 Photos taken during testing 9 1.12 Summary of Results and Conclusions 11 1.13 Test Equipment List 12 Appendices A Sample Calculations: 13 i. Calculation of Radiated Emissions Limits 14 ii. Duty Cycle Correction Factor Calculation 15 iii. Occupied Bandwidth Calculations 16 B Data Charts 17 C Graphs 19 LSC-Chamberlain 80232 1 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 DESCRIPTION OF MEASUREMENT FACILITIES Site on File with the FCC ID Number: 31040/SIT 1300F2 “ The site referenced above has been found to comply with the test site criteria found in ANSI C63.4-1992 and 47CFR Section 2.948.” LSC-Chamberlain 80232 2 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 SIGNATURE PAGE Prepared By: Approved By: Kenneth L. Boston 11 Nov1998 Kenneth L. Boston, EMC Lab Date Manager PE #31926 Registered Professional Engineer (State of Wisconsin) LSC-Chamberlain 80232 3 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 LSC-Chamberlain 80232 4 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.3 SUMMARY OF TEST REPORT MANUFACTURER: The Chamberlain Group MODEL: Craftsman 3 Channel Transmitter; 1A5247 SERIAL: LS08 DESCRIPTION: Low power Remote Transmitter FREQUENCY RANGE: 390 MHz The Craftsman 3 button Remote control was found to “meet” the radiated emission specification of Title 47 CFR FCC, Part 15, subpart C. for an intentional radiator This Remote Control device is meant to control the operation of a Garage Door lifting mechanism, from a distance of up to 150 feet or more. The associated control receiver is part of this system, and has been certified at an earlier date. LSC-Chamberlain 80232 5 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.4 INTRODUCTION On November 2 and 11 of 1998, a series of Radiated Emissions tests were performed on a sample model of the Craftsman 3 button Remote, a Remote control which operates a garage door by means of a short burst of data transmission containing an I.D. code. These tests were performed using the test procedures outlined in ANSI C63.4-1992 for intentional radiators, and in accordance with the limits set forth in FCC Part 15.231a,b for a periodic transmitter. These tests were performed by Kenneth L. Boston, PE, of L. S. Compliance, Inc. 1.5 PURPOSE The above mentioned tests were performed in order to determine the compliance of Craftsman 3 button Remote product with limits contained in various provisions of Title 47 CFR, FCC Part 15, including: 15.205 15.231b 15.209 15.231c All radiated emissions tests were performed to measure the emissions in the frequency bands described by the above sections, and to determine whether said emissions are below the limits established by the above sections. These tests were performed in accordance with the procedure described in the American National Standard for methods of measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz (ANSI C63.4-1992). Another document used as reference for the EMI receiver specification was the International Special Committee on Radio Interference (CISPR) number 16-1 (1993). 1.6 RADIATED EMISSIONS TEST SETUP The test sample was operated within the 3 meter Semi-Anechoic, FCC listed chamber located at L.S. Compliance in Cedarburg, WI. The sample was placed on an 80cm high wooden pedestal, which was centered on the flush-mounted 2m diameter metal turntable. The test sample was operated on its own [new] internal battery. The test sample was configured to run in a continuous transmit mode during the 15.231c and 15.231b measurements. This was accomplished by the use of a small Plexiglas stand, which had a plastic plunger simulating a finger, which held down on of the activating buttons. The three buttons were all activated to transmit, and the large button gave the highest emission signature, and was used for all the testing. One test sample, set to operate on the standard channel, was tested as an intentional radiator, in order to determine compliance at a frequency of 390 MHz, Please refer to Section 1.11 for pictures of the test setup. LSC-Chamberlain 80232 6 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.7 RADIATED EMISSION TEST PROCEDURE The fundamental and spurious (harmonic) emissions of the transmitter were tested for compliance to Title 47 CFR, FCC Part 15.231b limits for periodic devices. For the calculations used to determine the limits applicable for the test sample, refer to Appendix A. These limits are expressed in decibels (dB) above 1 microvolt per meter (µV/m). The sample was tested from the lowest frequency generated by the transmitter (without going below 9 kHz) to the 10th harmonic of the fundamental frequency generated by the device. The appropriate limits were also observed when the fundamental or spurious signals were located within any of the restricted bands as described in Part 15.205a. These frequencies, and their associated limits, are referenced in Section 7.10. The sample was placed on a nonconductive (wooden) pedestal in the 3 Meter chamber and the antenna mast was placed such that the antenna was 3m from the test object. A biconical antenna or tuned dipole was used to measure emissions from 30 to 200 MHz, a log periodic or tuned dipole was used to measure emissions from 200 to 1000 MHz, and a double ridged waveguide horn was used to measure emissions above 1 GHz. The test object was programmed to operate in continuous transmit, with a shortened repeat time, and the resultant signals were maximized by rotating the turntable 360 degrees, and by raising and lowering the antenna between 1 and 4 meters. The test object was also given several different orientations to determine the maximum signal levels, using both horizontal and vertical antenna polarities. No significant emissions were found aside from the transmitter fundamental and several harmonics. The unit was scanned for emissions, over the range 30 to 4000 MHz to establish compliance with Part 15.231b and 15.205 while in continuous transmit. At frequencies below the fundamental, no spurious signals, other than the noise floor of the system could be found within 20 dB of the limits. In addition to measuring the levels of radiated emissions, the occupied bandwidth of the transmitter was measured. In accordance with FCC Part 15.231c, the 20dB bandwidth of the transmitted signal should be within a window of 0.25% of the center carrier frequency. The calculation for this bandwidth can be found in Appendix A. The resolution bandwidth was set to the closest available filter setting on the HP8546A EMI system that corresponded to 5% of the allowable bandwidth determined in the calculation mentioned above, without going below the resolution bandwidth of 10kHz, as dictated in ANSI C63.4-1992 section 13.1.7. The sample was activated to transmit in a continuous mode and was placed on the aforementioned pedestal within the 3 meter chamber. The transmitted signal was received on a tuned dipole antenna and fed to the HP8546A EMI System, where the fundamental frequency was displayed, and a plot of the occupied bandwidth was produced. These plots are included in Appendix C. From the data supplied, it can be seen that the test samples do indeed “meet” the bandwidth requirement established by FCC Part 15.231(c). LSC-Chamberlain 80232 7 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.8 TEST EQUIPMENT UTILIZED FOR RADIATED EMISSIONS TEST A list of the test equipment and antennas used for the tests can be found in Section 1.13, which includes the calibration information as well as the equipment description. All equipment is calibrated and used according to the user manuals supplied by the manufacturer. All antenna calibrations were performed at a N.I.S.T traceable site, and the resultant correction factors were entered into the Hewlett Packard 8546A EMI receiver software database. The connecting cables used were also measured for loss using a calibrated signal generator and the HP 8546A EMI receiver. The resulting loss factors were entered into the HP 8546A database. This allowed for automatic changes in the antenna correction factor, as well as cable loss or other corrections, to be added to the EMI receiver display while taking measurements. Thus, the resulting data taken from the HP 8546A is an actual reading and can be entered into the database as a corrected meter reading. When a reading is taken using the peak detector, a duty cycle correction factor can be applied for conversion to an average reading. This operation can be used when measuring periodic data transmission, under FCC part 15.231b, and Part 15.35c. The calculation for deriving this duty factor can be found in Appendix A. The resulting average reading was then compared to the appropriate limit in order to determine compliance. The HP 8546A EMI receiver was operated with a bandwidth of 120 kHz when receiving signals below 1 GHz, and with a bandwidth of 1 MHz when receiving signals above 1 GHz, in accordance with CISPR 16. Both the peak and Quasi-peak detector functions were used. 1.9 CONDUCTED EMISSION TEST Due to the fact that this product operated on its own internal battery power, as opposed to using a power cord, it was not necessary to perform a test for Conducted Emissions. LSC-Chamberlain 80232 8 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 Manufacturer: Chamberlain Model: 1A5247 Serial Number(s): LS08 1.10 - Restricted Bands affecting this product Frequency (MHz) Limit (µV) Limit (dB/µV/m) 399.9-410 200 46.0 608-614 200 46.0 960-1240 500 54.0 1300-1427 500 54.0 1435-1626.5 500 54.0 1645.5-1646.5 500 54.0 1660-1710 500 54.0 1718.8-1722.2 500 54.0 2200-2300 500 54.0 2310-2390 500 54.0 2483.5-2500 500 54.0 2655-2900 500 54.0 3260-3267 500 54.0 3332-3339 500 54.0 3345.8-3358 500 54.0 3600-4400 500 54.0 LSC-Chamberlain 80232 9 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.11 – Photos taken during testing LSC-Chamberlain 80232 10 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 View of the Remote Control transmitter during the Radiated Emissions tests. This view shows the orientation of the product where the maximum signal levels were present (vertical polarity). In order to cause the remote transmitter to run continuously, a small plexiglass fixture can be seen which pushes a plunger down on the appropriate button to activate transmission. LSC-Chamberlain 80232 11 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.12 SUMMARY OF RESULTS AND CONCLUSIONS Based on the procedures outlined in this report, and the test results included in appendices B and C, it can be determined that the Craftsman 3 button Remote Transmitter does “meet” the emission requirements of Title 47 CFR, FCC Part 15 Subpart C for an intentional radiator. The level of the 3rd harmonic emission of the sample was found to be only 0.23 dB below the limit in the worst case configuration. As this level is within the tolerances of the test equipment and site employed, there is a possibility that this unit, or a similar unit selected out of production may not meet the required limit specification if tested by another agency. The enclosed test results pertain to the samples of the test item listed, and only for the tests performed on the data sheets. Any subsequent modification or changes to the test items could invalidate the data contained herein, and could therefore invalidate the findings of this report. LSC-Chamberlain 80232 12 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 1.13 - Test Equipment Asset # Manufacturer Model # Serial # Description Due Date AA960003 EMCO 3121C 786 Dipole Set Antenna 7/14/99 AA960004 EMCO 3146 9512-4276 Log Periodic Antenna 9/12/99 AA960005 EMCO 3110B 9601/2280 Biconical Antenna 9/12/99 AA960007 EMCO 3115 99111-4198 Double Ridged Guide/Horn Antenna 7/20/99 EE960004 EMCO 2090 9607-1164 Mast/Ttable Controller I.O EE960013 HP 8546A 3617A00320 Receiver RF Section W/Display and RF filter section 8/12/99 EE960014 HP 85460A 3448A00296 Receiver RF Section Preselector 8/12/99 LSC-Chamberlain 80232 13 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 APPENDIX A: SAMPLE CALCULATIONS LSC-Chamberlain 80232 14 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 Manufacturer: The Chamberlain Group Model: 1A5247 Serial Number(s): LS08 Calculation of Radiated Emissions limits for FCC Part 15.231(b) (260-470 MHz) FIELD STRENGTH OF FUNDAMENTAL FREQUENCIES: The calculation involves a linear interpolation of 3750 to 12500 µV/m over 260-470 MHz, Where field strength of the fundamental frequency (f0) when, 260≤ f0≤470 MHz, can be found by: 3750.0+41.667(f0-260), where f0 is in MHz. FIELD STRENGTH OF SPURIOUS/HARMONIC FREQUENCIES: The calculation involves a linear interpolation of 375 to 1250 µV/m over 260 to 470 MHz, Where field strength of the harmonic frequencies (2f0, 3f0..), when 260≤ f0≤470 MHz, can be found by: 375.0+4.1667(f0-260), where f0 is in MHz.  Where f0 = 390 MHz Fundamental: 3750+41.667(390-260) = 9166.7 µV/m Harmonic: 375+4.1667(390-260) = 916.67 µV/m Frequency Fundamental limit Fundamental limit Harmonic limit Harmonic limit (MHz) µV/m) (µ (dB µV/m) µV/m) (µ (dB µV/m) 390 9166.67 79.24 916.67 59.24 LSC-Chamberlain 80232 15 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 Model: 1A5247 Serial Number(s): LS08 Duty Cycle Correction Factor Calculation For a graphical presentation of the data bursts being transmitted from the Remote Control Transmitter, refer to Appendix C. This plot was taken of a unit, which has been programmed to send its activation code repeatedly, by holding down one of the buttons, to permit radiated emissions tests to be readily performed. When the unit is activated by a user pressing one of the keys, the transmitter sends out an alternating code frame, where the first frame is 80 milliseconds long; consisting of 41 ms of code and a 39 ms. Blanking interval.. This is followed by a second frame consisting of 43 ms of code and 37 ms. of blanking interval. These frames alternate continuously as long as the button is held down, out to a maximum of 3 minutes, where it will shut down. The auto shutdown saves batteries in case of a key being accidentally depressed while in a persons pocket, by pressure from keys or coins. The coded bits are trinary, with a ¾ on time per bit corresponding to a logic one. The highest duty cycle occurs when a second frame is followed by a first frame, and all the bits are logic one. When the total On- time is computed over a100 millisecond window, according to FCC Part 15.35(c), where the pulse train exceeds 100 milliseconds, a total of 48.25 milliseconds is obtained. This results in a relaxation factor of 6.33 dB, which is under the allowable cap of 20 dB, as stated in FCC Part 15.35(b) Relaxation Factor = 20 log (48.25/100) = 6.33 dB LSC-Chamberlain 80232 16 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 Manufacturer: The Chamberlain Group Model: 1A5247 Serial Number: LS08 Occupied Bandwidth Calculations FCC Part 15.231(c) states that the bandwidth of the periodic device shall be no wider than 0.25% of the center frequency for devices operating between 70 and 900 MHz. Said bandwidth is determined at the -20 dB reference to peak carrier points. For 390 MHz, the 20 dB bandwidth is 0.0025 X 390 = 0.975 MHz Refer to Appendix C for the set of graphs that show the actual occupied bandwidth of the test sample, which for this sample is 0.473 MHz, well within the limits. LSC-Chamberlain 80232 17 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 APPENDIX B: DATA CHARTS LSC-Chamberlain 80232 18 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 Measurement of Electromagnetic Radiated Emission within 3 Meter FCC Listed Chamber Frequency Range inspected: 30 to 3500 MHz Date of Test: November 2, 1998 Manufacturer: The Chamberlain Group Location: L. S. Compliance, Inc. Model No.: 1A5247 W66 N220 Commerce Court Operating Freq. 390 MHz Cedarburg, WI 53012 Specifications 47CFR FCC Part 15.231b,15.205 Serial No.: : Distance: 3 meters Configuration: Active, continuous burst Equipment: HP 8546A EMI Receiver Detector(s) Used: Peak EMCO 3115 Double Ridged Waveguide EMCO 3146A Log Periodic EMCO 3121C Tuned Dipole EMCO 3110B Biconical The following table depicts the level of significant fundamental and harmonic emissions found: Higher order harmonics were found to be below the noise floor of the receiving system: EMI Meter Duty Cycle Corrected Frequency Antenna Height Azimuth 15.231b Limit Margin Reading Correction Reading (MHz) Polarity (meters) (0° - 360°) (dB µV/m) (dB) (dB µV/m) (dB) (dB µV/m) 390.55 H 1.0 90 82.5 6.33 76.17 79.24 3.07 390.55 V 1.4 90 82.3 6.33 75.97 79.24 3.27 781.33 H 1.1 200 50.4 6.33 44.07 59.24 15.17 781.33 V 1.3 95 45.0 6.33 38.67 59.24 20.57 1171.9 H 1.35 280 60.1 6.33 53.77 54.0 0.23 1171.9 V 1.0 95 59.3 6.33 52.97 54.0 1.03 1562.6 H 1.0 65 57.8 6.33 51.47 54.0 2.53 1562.6 V 1.05 90 55.8 6.33 49.47 54.0 4.53 1953.3 H 1.1 75 54.9 6.33 48.57 59.24 10.67 1953.3 V 1.2 110 53.5 6.33 47.17 59.24 12.07 2343.9 H 1.2 215 52.0 6.33 45.67 54.0 8.33 2343.9 V 1.0 70 50.6 6.33 44.27 54.0 9.73 LSC-Chamberlain 80232 19 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 APPENDIX C: GRAPHS LSC-Chamberlain 80232 20 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 390 MHz Remote Control, emissions below 1 GHz, horizontal polarity LSC-Chamberlain 80232 21 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 390 MHz Remote Control, emissions below 1 GHz, vertical/horiz polarity LSC-Chamberlain 80232 22 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 390 MHz Remote Control, emissions above 1 GHz, horizontal polarity LSC-Chamberlain 80232 23 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 LSC-Chamberlain 80232 24 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 390 MHz Remote Control, occupied bandwidth LSC-Chamberlain 80232 25 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 390 MHz Remote Control, duty cycle, burst period LSC-Chamberlain 80232 26 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 390 MHz Remote Control, duty cycle, burst duty cycle LSC-Chamberlain 80232 27 of 25

L. S. COMPLIANCE, Inc. FCC ID: HBW1A5247 LSC-Chamberlain 80232 28 of 25


Document Created: 2001-07-10 15:28:12
Document Modified: 2001-07-10 15:28:12
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