Experimental License Application Amendment

0192-EX-CN-2018 Text Documents

The MITRE Corporation

2018-02-23ELS_205376

TECHNICAL EXHIBIT AMENDMENT TO PENDING FCC EXPERIMENTAL LICENSE APPLICATION The MITRE Corporation The MITRE Corporation seeks to acquire a FCC Experimental License to transmit data within the High Frequency (HF) band between 2.505 MHz and 16 MHz in Bedford, Massachusetts, and Stockbridge, New York. This is a follow-on of the previous STA, 1371-EX-ST-2017. NLCC/NC3 is evaluating HF communications and have asked the MITRE to lead the testing and evaluation of advanced beyond line of sight (BLOS) High Frequency (HF) communications. Testing will be both periodic and on an as needed basis. As such, we will need transmit authority for the time frame in these two locations. This Exhibit describes the program of research and experimentation proposed, including: description of equipment and theory of operation; the specific objectives sought to be accomplished; and how the program of experimentation has a reasonable promise of contribution to the development, extension, expansion or utilization of the radio art and/or is along lines not already investigated. Research and Experimentation Program Description Assured beyond line-of-sight (BLOS) communications is a challenging problem yet essential for our warfighters. Military and civilian systems rely on a combination of high data rate satellite connectivity as well as low data rate HF Sky Wave communications. While satellite communication provides high data rate connectivity, there are vulnerabilities that include degradation and disruption of service. HF radio communication generally are limited to narrower bandwidths and lower data rates than satellite communications. To ensure critical communications are maintained, we are investigating the capability of commercial off-the shelf equipment and their implementation of MIL-STD-188-110C (inclusive of Appendix D Wideband waveforms), MIL-STD-188-141C, STANAG 4538 FLSU, STANAG 4285, and STANAG 4415. Long distance HF communication is accomplished via reflection of HF radio waves off the ionosphere, a variable medium. This introduces challenges that must be overcome to make HF communications more reliable. These include multipath propagation and polarization rotation; both contribute to signal fades. We will demonstrate reliable BLOS HF communications with both robust voice communications and high data rates; characterize the ionosphere; and deterministically evaluate various frequency selection protocols – VOACAP predictive models, sounding, 2G ALE, and 3G ALE. Objectives The goal is to communicate reliably in both the mid-latitudes; evaluating and the performance of COTS equipment, and the impact of ionospheric channel conditions unique to their geographical The MITRE Corporation 202 Burlington Road, Bedford MA 01730

FCC Office of Engineering and Technology (OET) Page 2 locations. Multiple waveforms will be tested; MIL-STD-188-110C (inclusive of Appendix D Wideband waveforms), MIL-STD-188-141C, STANAG 4538 FLSU, STANAG 4285, and STANAG 4415. The research program is planned to include a series of over-the-air (OTA) demonstrations, each testing new waveforms. We will attempt to test the capabilities, trade-offs, and performance of these waveforms over varying channel conditions to evaluate the impact on the sponsor mission space. We will also perform ionospheric sounding for channel characterization and waveform calibration. The requested frequencies and transmission operational parameters are those permitted under Section 90.266 of the Commission’s Rules, Long Distance Communications on Frequencies below 25 MHz and are identified specifically in the FCC’s Electronic Code of Federal Regulations, Title 47 (Telecommunication), Volume 1, Chapter 1, Part 2.106 Table of Frequency Allocations. These frequencies bands requested are designed to avoid the Restricted Bands of Operation outlines in the Electronic Code of Federal Regulations, Title 47 (Telecommunication), Part 15 (Radio Frequency Devices), Subpart C Intentional Radiators. Listed in the following Table 1 are the requested proposed technical parameters for the experimental research program. Crossed Dipole (Signal) Transmit Antenna Transmitter Site Locations Transmitter Site #1 Bedford, MA (MITRE Corp) 42.50361111 N, 71.23638889 W Crossed Dipole Antenna Radiation Center: 5.9 m AGL Crossed Dipole (signal) Transmit Antenna Azimuth Orientation: omnidirectional Crossed Dipole (signal) Transmit Antenna Vertical Plane Orientation: 90 degrees (120 Deg beamwidth) Transmitter Site #2 Stockbridge, NY (Peterboro Road) 43.02972222 N, 75.65138889 W Antenna Configuration same as Transmitter Site # 1 2505.0 - 4100.0, 4210.0 - 4650.0, 4700.0 - 4995.0, 5005.0 - 6210.0, 6400.0 - 8250.0, 8970.0 - 9995.0, Requested Frequency ranges (kHz) 10005.0 - 11275.0, 11400.0 - 12200.0, 13500.0 - 14990.0, 15010.0 - 16000.0 Maximum Transmit Power 400 Watts (average varies between 20 and 400 Watts) Transmitter Harris RF-7800H Wideband HF Manpack Radio Transmitting Antenna MITRE-built Crossed-Dipole (see Figure 1) Broadband bow-tie shaped, inverted vee-dipoles with resistive loading Small Footprint (< 20 meter diameter) Dipoles are arranged orthogonally on mast to produce x-,y- polarizations Maximum Occupied Bandwidth 24 kHz Most of the experimention will be conducted during the daylight hours, some portion may run up to Maximum Transmit Time Duration (Duty) 24 hours. Duty cycle will be up to 100% , but is expected to averaged < 10% per week. Table 1. Proposed Experimental Crossed-Dipole Transmission Parameters

FCC Office of Engineering and Technology (OET) Page 3 The MITRE-developed Crossed-Dipole antenna configuration and dimensions are shown in Figure 1 below. Figure 1. Model Crossed Dipole Antenna (< 20m diameter) The system supports two orthogonal polarizations: two inverted vee-dipoles (x-, y-polarized). The antenna elements are well matched over 2.505-16 MHz to 50 ohms and offset to avoid mutual coupling effects. The antennas exhibit omnidirectional antenna patterns with an antenna gain of 2 dBi between 2.505 and 16 MHz. The system is simple, low-cost and MITRE- fabricated, -assembled, and –setup. Crossed Dipole (Signal) Transmit Antenna Transmitter Site Locations Transmitter Site #1 Bedford, MA (MITRE Corp) Crossed Dipole Antenna Radiation Center: 5.5 m AGL Crossed Dipole (signal) Transmit Antenna Azimuth Orientation: omnidirectional Crossed Dipole (signal) Transmit Antenna Vertical Plane Orientation: 90 degrees (132 Deg beamwidth) 42.50361111 N, 71.23638889 W Antenna Configuration same as Transmitter Site # 1 Transmitter Site #2 Stockbridge, NY (Peterboro Road) 43.02972222 N, 75.65138889 W Antenna Configuration same as Transmitter Site # 1 2505.0 - 4100.0, 4210.0 - 4650.0, 4700.0 - 4995.0, 5005.0 - 6210.0, 6400.0 - 8250.0, 8970.0 - 9995.0, Requested Frequency ranges (kHz) 10005.0 - 11275.0, 11400.0 - 12200.0, 13500.0 - 14990.0, 15010.0 - 16000.0 Maximum Transmit Power 400 Watts (average varies between 20 and 400 Watts) Transmitter Harris RF-7800H Wideband HF Manpack Radio Transmitting Antenna Wideband HF Antenna(see Figure 1) Maximum Occupied Bandwidth 24 kHz Most of the experimention will be conducted during the daylight hours, some portion may run up to Maximum Transmit Time Duration (Duty) 24 hours. Duty cycle will be up to 100% , but is expected to averaged < 10% per week. Table 2. White Wolf Systems Crossed-Dipole Transmission Parameters Version 1 (5.5m height)

FCC Office of Engineering and Technology (OET) Page 4 Crossed Dipole (Signal) Transmit Antenna Transmitter Site Locations Transmitter Site #1 Bedford, MA (MITRE Corp) Crossed Dipole Antenna Radiation Center: 18 m AGL Crossed Dipole (signal) Transmit Antenna Azimuth Orientation: omnidirectional Crossed Dipole (signal) Transmit Antenna Vertical Plane Orientation: 90 degrees (132 Deg beamwidth) 42.50361111 N, 71.23638889 W Antenna Configuration same as Transmitter Site # 1 Transmitter Site #2 Stockbridge, NY (Peterboro Road) 43.02972222 N, 75.65138889 W Antenna Configuration same as Transmitter Site # 1 2505.0 - 4100.0, 4210.0 - 4650.0, 4700.0 - 4995.0, 5005.0 - 6210.0, 6400.0 - 8250.0, 8970.0 - 9995.0, Requested Frequency ranges (kHz) 10005.0 - 11275.0, 11400.0 - 12200.0, 13500.0 - 14990.0, 15010.0 - 16000.0 Maximum Transmit Power 400 Watts (average varies between 20 and 400 Watts) Transmitter Harris RF-7800H Wideband HF Manpack Radio Transmitting Antenna Wideband HF Antenna(see Figure 1) Maximum Occupied Bandwidth 24 kHz Most of the experimention will be conducted during the daylight hours, some portion may run up to Maximum Transmit Time Duration (Duty) 24 hours. Duty cycle will be up to 100% , but is expected to averaged < 10% per week. Table 3. White Wolf Systems Crossed-Dipole Transmission Parameters Version 2 (18m height) Figure 2. White Wolf Systems Antenna Overhead View

FCC Office of Engineering and Technology (OET) Page 5 Some of the equipment was purchased from commercial vendors. Table 2 shows a list of the commercially purchased equipment that will be used during the experiment(s). Table 2. Commercially purchased transmission equipment list. Research and Experimentation Contribution to the Development of the Radio Art Assured beyond line-of-sight communications is a challenging problem yet essential for certain types of communication. Fortunately, HF technology is uniquely suited to address this problem, applying new techniques and understanding of the ionosphere. With HF, BLOS communications is achievable without the use of satellites or pseudo-lites. The traditionally low data rates can be improved upon as well. In today's economic climate, HF is very affordable, with a well- established commercial market. MITRE's work will demonstrate the performance of multiple waveforms, record ionospheric conditions If there are any technical questions with the proposed application, please contact one of the undersigned. Stephen Yablonski The MITRE Corporation 202 Burlington Road Bedford MA 01730

FCC Office of Engineering and Technology (OET) Page 6 June 12, 2017 .


Document Created: 2018-02-23 09:38:42
Document Modified: 2018-02-23 09:38:42
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