Antenna Drawing

1932-EX-ST-2019 Text Documents

Bell Textron

2019-10-12ELS_239552

October 12, 2019 Federal Communications Commission 445 12th Street SW Washington, DC 20554 (316) 821-9516 Title: STA License Request for HIRF Testing at Bell Facility, Amarillo, Texas Application File Number: 1932-EX-ST-2019 Confirmation Number: EL899261 >>> ARLINGTON, TX LOCATION <<< Dear FCC, This request for Special Temporary Authority (STA) is submitted pursuant to 47 CFR 5.61 to request authorization to perform High Intensity Radiated Field (HIRF) testing. This testing is to be performed in support of an FAA aircraft certification program and is intended to show compliance with 14 CFR 25.1317. The proposed operation is expected to be completed within a period not to exceed two months. Note: requested period is for 6 months to allow for schedule changes should they arise. STA is required because the aircraft and its systems will be subjected to HIRF susceptibility tests including the use of frequencies from 1.5 MHz to 100 MHz. HIRF testing: The operation to be performed includes the execution of low-level coupling HIRF tests comprised of low level swept current (LLSC) tests. The LLSC test will involve illuminating the aircraft with low-level external HIRF field to measure the transfer function between the external field and the aircraft and equipment wire bundle currents. By calculating the ratio between the induced wire bundle current and the illuminating antenna field strength and normalizing this ratio to 1 V/m, the transfer function in terms of induced current per unit of external field strength will be defined. The current induced by the applicable external HIRF environment can then be calculated by multiplying the transfer function by the external HIRF field strength. Page 1 of 6 Post Office Box 482 Fort Worth, Texas 76101 Tel: 817-280-7984

Bell has hired DNB Engineering, Inc., a full-service EMC/EMI, HIRF, RF and Indirect Lightning testing service for Aerospace, Commercial and Military industries, to be onsite at the Bell Amarillo, Texas facility supporting the HIRF testing. DNB Engineering, Inc. 1750 Raymer Ave Fullerton, CA 92833 (714) 888-0010 EQUIPMENT: Table 1 lists all relevant test equipment. Table 1: Test Equipment Model No of Manufacturer Number Function Units Aeroflex IFR 2023B Signal Generator 10kHz to 2000 MHz 1 Atec IFI SCCX 100 Amplifier 100 Watts 10kHz to 220 MHz 1 DNB Engineering BD05-25 Large Dipole Antenna 0.5 to 30 MHz (-12dBi gain) 1 EMCO 3243 BiconiLog Antenna 25 MHz to 1000MHz (-6 to -24 dBi gain) 1 Page 2 of 6 Post Office Box 482 Fort Worth, Texas 76101 Tel: 817-280-7984

TRANSMITTED FREQUENCIES: Table 2 lists the specific frequencies being transmitted. This list has been coordinated with the Aerospace & Flight Test Radio Coordinating Council (AFTRCC) and incorporates recommended AFTRCC changes so as not to require a formal AFTRCC coordination. Table 2: Transmitted Frequencies (MHz) per DO-160 Sec 20.3 formula fn+1=fn*10(1/100) LARGE DIPOLE BICONILOG 1.5 2.433 3.945 6.399 10.377 16.83 26.067 42.276 68.563 1.535 2.489 4.037 6.547 10.619 17.222 26.674 43.26 70.16 1.571 2.547 4.131 6.7 10.867 17.623 27.296 44.268 71.795 1.607 2.607 4.228 6.856 11.12 18.034 27.931 45.299 73.467 1.645 2.667 4.326 7.016 11.379 18.454 28.582 46.354 75.178 1.683 2.73 4.427 7.179 11.644 18.884 29.248 47.434 76.929 1.722 2.793 4.53 7.347 11.915 19.324 29.929 48.539 78.721 1.762 2.858 4.635 7.518 12.192 19.774 30.626 49.67 80.555 1.803 2.925 4.743 7.693 12.476 20.234 31.339 50.827 82.431 1.845 2.993 4.854 7.872 12.767 20.706 32.069 52.011 84.351 1.888 3.063 4.967 8.055 13.064 21.188 32.816 53.222 86.316 1.932 3.134 5.083 8.243 13.369 21.682 33.581 54.462 88.327 1.977 3.207 5.201 8.435 13.68 22.187 34.363 55.73 90.384 2.023 3.284 5.322 8.632 13.999 22.703 35.163 57.028 92.489 2.071 3.358 5.446 8.833 14.325 23.232 35.982 58.357 94.644 2.119 3.436 5.574 9.038 14.659 23.773 36.821 59.716 96.848 2.168 3.516 5.703 9.249 15 24.327 37.678 61.107 99.104 2.219 3.598 5.836 9.464 15.349 24.894 38.556 62.53 100 2.27 3.682 5.972 9.685 15.707 25 39.454 63.987 2.323 3.768 6.111 9.91 16.073 40.373 65.477 2.377 3.856 6.253 10.141 16.447 41.313 67.003 Page 3 of 6 Post Office Box 482 Fort Worth, Texas 76101 Tel: 817-280-7984

TEST LOCATION: Testing will be conducted onsite at the Bell Flight Test Research Center located at 600 Interstate 20 east, Arlington, TX 76018. The specific location in WGS 84 coordinates is Latitude 32° 39' 58.56" N and Longitude 97° 5' 58.14" W at an elevation of 191 m. Figure 1 below shows an aerial view of the test location. The antenna location, indicated by the yellow star, will be approximately 50 feet in front of the EMC building. The aircraft location (red X) will be 100 feet from the antenna. The tallest antenna is 15m tall in the vertical position. The height of the EMC building is about 5 meters tall. The facility building is about 15 meters tall and 80 meters wide providing some blockage to the north. Figure 1: Aerial View of Test Location Bell Hangar Arlington Airport EMC Building 150° Page 4 of 6 Post Office Box 482 Fort Worth, Texas 76101 Tel: 817-280-7984

TEST CONFIGURATION: Figure 2 depicts the basic setup for both the large dipole antenna, as well as the BiconiLog antenna, transmitting in the vertically polarized position. This setup covers transmitting frequencies from 1.5 MHz to 25.000 MHz for the large dipole and 26.067 MHz to 100 MHz for the BiconiLog. In order to accommodate different aircraft azimuths, the aircraft will be rotated about the landing gear and the transmitting dipole will remain stationary. Figure 3 depicts the basic setup for both the large dipole antenna as well as the BiconiLog antenna transmitting in the horizontally polarized position. Large Dipole Antenna: • Width of beam in degrees at the half power point is 78 • Orientation in horizontal plane is 150 (degrees from True North) • Orientation in vertical plan is 0 (degrees from horizontal) BiconiLog Antenna: • Width of beam in degrees at the half power point is 100 • Orientation in horizontal plane is 150 (degrees from True North) • Orientation in vertical plan is 0 (degrees from horizontal) Figure 2: Large Dipole Antenna in the Vertical Configuration 50’ 100’ Page 5 of 6 Post Office Box 482 Fort Worth, Texas 76101 Tel: 817-280-7984

Figure 3: Large Dipole Antenna in the Horizontal Configuration 50’ 100’ Stop Buzzer Contact: Bell Textron Hotline (817) 280-4862 Kind Regards, Mark Stoufflet Bell Frequency Coordinator mstoufflet@bellflight.com (817) 280-7984 Page 6 of 6 Post Office Box 482 Fort Worth, Texas 76101 Tel: 817-280-7984


Document Created: 2019-10-12 15:22:17
Document Modified: 2019-10-12 15:22:17
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