Conops and Test Description

1124-EX-ST-2015 Text Documents

L-3 Communications

2015-10-12ELS_168148

L-3 Communications, CS-W Special Temporary Authorization Date: 10/12/2015 File No.: EL693298 STA File No.: 1124-EX-ST-2015 License: ?????? Application Background: The purpose of this project is to do a passive intermodulation (PIM) test on a SATCOM antenna that will be used on the Boeing E-4B that serves as the United States National Airborne Operations Center. Concept of Operations: The PIM test requires very high RF signals in-order to measure the very low intermodulation products. The RF radiated power can be dissipated into a high power load or directly into free space. In this case, the antenna under test will transmit into free-space. The transmitting antenna elevation angle will be adjusted to 45° above the horizon. The antenna azimuth will be 49° west of true north. The transmit antenna azimuth and elevation angles have been selected to minimize potential interference. See figure 1 for a concept of o Spectrum Requirements: Two CW frequencies will be used as the tones for the intermodulation test. Tone1 will be at 7.9 GHz and tone2 is at 8.1 GHz. These frequencies are fixed, un-modulated, continuous wave signals. The tones are generated in COTS test equipment, amplified through high power amplifiers to 1 kW, and filtered/power combined before radiating. Figure 1 Concept of Operations

Location of Testing: The location of the antenna testing is at L-3 CS-W Building Z. The GPS coordinates for that location are 40° 46’ 37.5” N and 111° 57’ 0.33” W. The transmitting antenna will be pointing in a north westerly direction (-49° from true north) to avoid military and FAA installations. The transmitting antenna elevation angle will be 45°. See Figure 2 test location and horizontal orientation. Figure 2 Test Location and Horizontal Orientation of the Antenna


Document Created: 2015-10-12 13:58:52
Document Modified: 2015-10-12 13:58:52
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