Purpose of Experiment

0549-EX-CN-2017 Text Documents

Row 44, Inc.

2017-07-10ELS_194915

                                                    Attachment 1

                                              Purpose of Experiment


Row 44, Inc. (“Row 44”)1 hereby seeks authorization for the experimental operation of a new Ka Band antenna.

Row 44 is proposing to operate within the 29.25-30.0 GHz Ka uplink band and the 18.3-18.8, 18.8-19.3, and 19.7-20.2
GHz downlink bands using the QEST Q09000 Ka-Band Horn-Array-Aperture Antenna. (See Table 1 for details.)

The QEST Q09000 Antenna’s transmit gain is 33.4 dBi nominal, at 29.0 GHz; the receive gain 35.5 dBi nominal, at 19.2
GHz. (See Table 2 for details.) It operates in either a Left-Hand or Right-Hand Circular Polarization mode. The QEST
Q09000 incorporates independent, linear-polarized array antennas compliant with the off-axis antenna envelope
established in Section 25.209(a)(3) of the Commission’s Rules. The Q09000’s aperture has dimensions: D = 0.617 meters;
H = 0.161 meters, and a surface area A = 0.099 m^2.

The proposed transmit bandwidth, EIRP density, and skew relationships for the QEST Q09000 in the 29.25 to 30.0 GHz
band are indicated in Table 3. The associated maximum input power flux density at the antenna flange will be 12.9
dBW/MHz. The antenna’s emissions, as radiated under the conditions of skew angle up to 60 degrees, will not exceed
the uplink off-axis EIRP density mask of 25.138(a)(1), applicable to those tangent to the Geostationary Arc.

The Ka Antenna, as designed for installation on an aircraft fuselage, exhibits an aperture which is dimensionally-
restricted, so as to minimize aerodynamic drag. Due to these limitations, the antenna’s elevation pattern is wider than
its azimuth, thereby complying with the gain limits of 25.209(a)(3) (tangent to the GSO arc), 25.209(b)(3) (cross-pol), but
exhibiting limited compliance with 25.209(a)(6) (perpendicular to the GSO arc). (See the included Ka Antenna gain
plots.)

In its functions, the Ka transmitter will adjust the transmit signal level applied to the antenna flange based on the skew
angle to the satellite. In the unlikely event the antenna’s pointing-direction is predicted to deviate from the target
satellite, such that the EIRP Density limits of 25.138 would be violated, the Row 44 System will pre-emptively mute the
transmitter, and will continue doing so only until unmuting of the transmitter would result in emissions compliant with
the applicable 25.138 limits.

The Row 44 ESAA antennas will be installed and operated in accordance with the above conditions and/or any other
operational requirements specified in the Experimental FCC Authorization proposed to be granted to Row 44. If the use
of this Ka Antenna should cause unacceptable interference into other systems, Row 44 will terminate transmissions
immediately upon notice from Hughes, the FCC, or any other affected parties.




1
  Row 44, Inc. is the FCC-licensee entity authorized to operate an Earth Stations Aboard Aircraft (“ESAA”) network in the
Ku-band. The service is operated under the name of Row 44’s parent company, Global Eagle Entertainment. For
consistency, the licensee entity name, Row 44, is used throughout this document.


                               Table 1 – Ka Antenna General Characteristics
                           Antenna Make                             QEST Q09000
                            Antenna Type                         Horn Array Aperture
                        Width / Height / Area               0.617 m / 0.161 m / 0.099 m^2
                         RX Frequency Range                        18.3 – 20.2 GHz
                        RX Gain, beam-center                       34.4 – 35.9 dBi
                         TX Frequency Range                        28.3 – 30.0 GHz
                        TX Gain, beam-center                       33.0 – 33.7 dBi
                   TX Beamwidth, Azimuth (-3 dB)                      1.0 Degree
                   TX Beamwidth, Elevation (-3 dB)                   3.4 Degrees
                             Polarization                            LHCP, RHCP


Table 2 - Ka Antenna Transmit Gain vs. Frequency, Applicable to Echostar 19 / Jupiter 2 Inroute Frequencies
                Frequency (GHz)              Antenna Gain (dBi)      Minimum Added Losses (dB)
                     29.0                          33.4                        1.5
                     29.5                          33.7                        1.5
                     30.0                          33.7                        1.5



       Table 3 – Proposed Operational TX Bandwidths and EIRP Density Limits based on Skew Angle


               1.024 MHz              2.048 MHz              4.096 MHz
                                                                                   Skew Range
               Bandwidth              Bandwidth              Bandwidth


             40.9 dBW/MHz           40.9 dBW/MHz           39.8 dBW/MHz           0, 5 Degrees



             43.2 dBW/MHz           42.8 dBW/MHz           39.8 dBW/MHz       10, 15, 20, 60 Degrees



             45.8 dBW/MHz           42.8 dBW/MHz           39.8 dBW/MHz          25 - 55 Degrees


                                                    Attachment 2

                                        Co-Polarized EIRP Density Plots
The following pages collectively-depict the EIRP Density plots for each of 29.0 and 30.0 GHz, for both LHP and RHP, for
skew angles over the range 0 to 60 degrees. 25.138 EIRP Density limits for both nominal and 10% of sidelobes are
referenced.

(Please note that since the Ka Antenna is of a Horn-Array-Aperture design exhibiting no back-lobes, the data is limited to
the -90 to +90 degree range.)


Figure 1 – EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 2 – EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 40.9 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 3 – EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 4 – EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 40.9 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 5 – EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 6 – EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 40.9 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 7 – EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 8 – EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 40.9 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 9 – EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 10 – EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 43.2 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 11 – EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 12 – EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 43.2 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 13 – EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 14 – EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 43.2 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 15 – EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 16 – EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 43.2 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 17 – EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 18 – EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 45.8 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 19 – EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 20 – EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 45.8 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 21 – EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 22 – EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 45.8 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


Figure 23 – EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(1) limits




Figure 24 – EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 45.8 dBW/MHz, -90 to +90 deg., 25.138(a)(1) limits


                                                    Attachment 3

                                      Cross-Polarized EIRP Density Plots


The following pages depict the cross-polarized EIRP Density plots for each of 29.0 and 30.0 GHz, for both LHP and RHP,
for skew angles over the range 0 to 60 degrees. The 25.138(a)(4) EIRP Density limits are referenced.

(Please note that since the Ka Antenna is of a Horn-Array-Aperture design exhibiting no back-lobes, the data is limited to
the -90 to +90 degree range.)


Figure 25 – X-Pol EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits




Figure 26 – X-Pol EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits


Figure 27 – X-Pol EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits




Figure 28 – X-Pol EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 40.9 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits


Figure 29 – X-Pol EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits




Figure 30 – X-Pol EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits


Figure 31 – X-Pol EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits




Figure 32 – X-Pol EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 43.2 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits


Figure 33 – X-Pol EIRP Density tangent to GSO Arc, 29.0 GHz, LHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits




Figure 34 – X-Pol EIRP Density tangent to GSO Arc, 29.0 GHz, RHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits


Figure 35 – X-Pol EIRP Density tangent to GSO Arc, 30.0 GHz, LHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits




Figure 36 – X-Pol EIRP Density tangent to GSO Arc, 30.0 GHz, RHP, 45.8 dBW/MHz, -10 to +10 deg., 25.138(a)(4) limits


                                                    Attachment 4

                                              Ka Antenna Gain Plots
                              (Tangent to GSO Arc, Perpendicular to GSO Arc, Co-Pol)



The following pages depict the Ka Antenna gain plots for 29.0 MHz, for both LHP and RHP, for skew angles over the
range 0 to 60 degrees, applicable to (1) Tangent to the GSO arc, (2) Perpendicular to the GSO arc, and (3) Tangent cross-
polarized gain.

(Please note that since the Ka Antenna is of a Horn-Array-Aperture design exhibiting no back-lobes, the data is limited to
the -90 to +90 degree range.)


Figure 37 – Ka Antenna Gain Tangent to GSO Arc, 29.0 GHz, LHP, -10 to +10 degrees, 25.209(a)(3) limits




Figure 38 – Ka Antenna Gain Tangent to GSO Arc, 29.0 GHz, LHP, -90 to +90 degrees, 25.209(a)(3) limits


Figure 39 – Ka Antenna Gain Tangent to GSO Arc, 29.0 GHz, RHP, -10 to +10 degrees, 25.209(a)(3) limits




Figure 40 – Ka Antenna Gain Tangent to GSO Arc, 29.0 GHz, RHP, -90 to +90 degrees, 25.209(a)(3) limits


Figure 41 – Ka Antenna Gain Perpendicular to GSO Arc, 29.0 GHz, LHP, -50 to +50 degrees, 25.209(a)(6) limits




Figure 42 – Ka Antenna Gain Perpendicular to GSO Arc, 29.0 GHz, RHP, -50 to +50 degrees, 25.209(a)(6) limits


Figure 43 – X-Pol Ka Antenna Gain Along GSO Arc, 29.0 GHz, LHP, -10 to +10 degrees, 25.209(b)(3) limits




Figure 44 – X-Pol Ka Antenna Gain Along GSO Arc, 29.0 GHz, RHP, -10 to +10 degrees, 25.209(b)(3) limits


                                                   Attachment 5

                                               Sample Link Budget


The following pages provide a sample link budget using satellite (97.1 degrees WL) Echostar 19 / Jupiter 2’s U 068
beam*, for an aircraft located in Washington DC.

(* The associated Hughes Gateway being located in San Diego)


                                                                               Page 1
Inroute Signal:                              QPSK 1/2
Uplink Frequency (MHz):                       29500                                                     Ka Antenna Link Budget
Downlink Frequency (MHz):                     20200
Baseband BW (MHz):                            1.024
Spread BW (MHz):                              1.024          Link Budget for satellite Jupiter 2           at       -97.0    degrees
Required C/N (dB):                             3.5
                                                                                          Skew operational limit:    25      degrees
Outroute Signal:                             QPSK 1/2
Uplink Frequency (MHz):                       29500
Downlink Frequency (MHz):                     20200        Inroute signal:    QPSK 1/2         rate      1.024      Msps    in bandwidth   1.024      MHz
Bandwidth (MHz):                               30         Outroute signal:    QPSK 1/2         rate       30        Msps    in bandwidth    30        MHz
Required C/N (dB):                             2.1

                                                                                               Lat        Long
Satellite:                                    Jupiter 2         Remote:         Dulles        38.953     -77.448
Longitude (deg East):                            -97             NOC:         San Diego       32.896    -117.202
Maximum Saturated Downlink EIRP (dBW):            50                                                                         Mispoint/              Intermod/
G/T towards Remote (dB/K):                       6.00                                                                          Rain/                 Satellite/
G/T towards NOC (dB/K):                          6.00                                                                       Atmospheric              Cross-pol
G/T Degradation (dB):                             0           Inroute Path:                            Ideal Link             Losses               Interference
Saturation Flux Density (dBW/m^2):               -87
Attenuation Setting (dB):                         8           EIRP towards satellite (dBW)               46.20                 45.20                   45.20
Saturated EIRP towards NOC (dBW):                 50          Uplink Path Loss (dB)                     213.40                213.40                  213.40
Saturated EIRP towards Remote (dBW):              50          Spreading Loss (dB)                       -162.53               -162.53                -162.53
Max Authorized Downlink EIRP (dBw/Hz):           -20          Flux Density at Satellite (dBW/m^2)       -116.33               -117.33                -117.33
Downlink EIRP backoff (dB):                 unnecessary       Uplink C/T (dB)                           -161.20               -162.20                -162.20
Adjusted Outroute EIRP to Remote (dBW):         50.00         C/No (dB)                                  67.40                 66.40                   66.40
Downlink EIRP Density to Remote (dBW/Hz):      -24.77         Noise BW (dB-Hz)                           60.10                 60.10                   60.10
Downlink EIRP Inroute (dBW):                    16.67         Interference (dB)                           N/A                   N/A                   -14.87
                                                              Uplink C/N (dB)                             7.30                  6.30                   5.73

Remote:                                        Dulles         Satellite downlink EIRP (dBW)              18.67                 16.67                   16.67
Latitude (deg North):                          38.953         Downlink Path Loss (dB)                   210.02                210.02                  210.02
Longitude (deg East):                         -77.448         Downlink C/T (dB)                         -155.85               -157.85                -157.85
TX Antenna Gain (dBi):                         33.70          C/No (dB)                                  72.75                 70.75                   70.75
TX Power (dBm):                                  44           Noise BW (dB-Hz)                           60.10                 60.10                   60.10
TX Backoff (dB):                                 0            Interference (dB)                           N/A                   N/A                   -18.19
Power into flange w losses (dBW/MHz):          12.90          Downlink C/N (dB)                          12.65                 10.65                   9.94
Unimpaired EIRP Density (dBW/MHz)              46.10
RX G/T (dB/K):                                 13.50
Antenna Mispoint (dB):                          0.5           Cumulative C/N (dB)                         6.19                  4.94                  4.34
Rain Attenuation (dB):                           0            Necessary C/N (dB)                          3.50                  3.50                  3.50
Atmospheric Attenuation (dB):                   0.5           Cumulative Inroute Link Margin (dB)         2.69                  1.44                  0.84


Inroute Uplink Interference                                            Page 2
Adjacent Channel Uplink (dB):             -30.0
Adjacent Satellite Uplink (dB):           -19.7                                               Ka Antenna Link Budget
Cross-Pol Uplink (dB):                    -19.7
Intermod Uplink (dB):                     -20.0
Cumulative Interf. Uplink (dB):          -14.87      Link Budget for satellite Jupiter 2         at       -97.0    degrees

Outroute Downlink Interference                                                  Skew operational limit:    25      degrees
Adjacent Channel Downlink (dB):           -30.0
Adjacent Satellite Downlink (dB):         -10.0
Cross-Pol Downlink (dB):                  -20.0                                                                    Mispoint/     Intermod/
Intermod Downlink (dB):                   -20.0                                                                      Rain/        Satellite/
Cumulative Interf. Downlink (dB):         -9.17                                                                   Atmospheric     Cross-pol
                                                      Outroute Path:                         Ideal Link             Losses      Interference
NOC:                                    San Diego
Latitude (deg North):                    32.896       EIRP towards satellite (dBW)             77.44                 76.44          76.44
Longitude (deg East):                   -117.202      Uplink Path Loss (dB)                   213.31                213.31         213.31
Antennna diameter (m):                    5.8 m       Spreading Loss (dB)                     -162.44               -162.44       -162.44
RX Antenna Gain (dBi):                      53        Flux Density at Satellite (dBW/m^2)      -85.00                -86.00        -86.00
Antenna Noise Temp (K):                     56        Uplink C/T (dB)                         -129.87               -130.87       -130.87
Antenna LNA Temp (K):                       70        C/No (dB)                                98.73                 97.73          97.73
Total Noise Temp (K):                      126        Noise BW (dB-Hz)                         74.77                 74.77          74.77
Antenna G/T (dB/K):                       35.50       Interference (dB)                         N/A                   N/A          -18.86
TX Antenna Gain (dBi):                     56.5       Uplink C/N (dB)                          23.96                 22.96         17.43
Conducted TX Power to Antenna (dBW):      20.94
TX backoff (dB):                       unnecessary    Satellite downlink EIRP (dBW)            50.00                 49.00         49.00
Power into flange (dBW/ MHz):              6.17       Downlink Path Loss (dB)                 210.11                210.11         210.11
Antenna mis-point (dB):                     0.5       Downlink C/T (dB)                       -146.61               -148.61       -148.61
Rain Attenuation (dB):                       0        C/No (dB)                                 7.22                  5.22           5.22
Atmospheric Attenuation (dB):               0.5       Noise BW (dB-Hz)                         74.77                 74.77         74.77
                                                      Interference (dB)                         N/A                   N/A           -9.17
Inroute Downlink Interference                         Downlink C/N (dB)                         7.22                  5.22          3.75
Adjacent Channel Downlink (dB):           -30.0
Adjacent Satellite Downlink (dB):         -25.0
Cross-Pol Downlink (dB):                  -20.0       Cumulative C/N (dB)                       7.13                 5.15          3.57
Intermod Downlink (dB):                   -30.0       Necessary C/N (dB)                         2.1                  2.1           2.1
Cumulative Interf. Downlink (dB):        -18.19       Cumulative Outroute Link Margin (dB)      5.03                 3.05          1.47

Outroute Uplink Interference
Adjacent Channel Uplink (dB):             -30.0
Adjacent Satellite Uplink (dB):           -30.0
Cross-Pol Uplink (dB):                    -20.0
Intermod Uplink (dB):                     -30.0
Cumulative Interf. Uplink (dB):          -18.86


                                                  Attachment 6

                            Echostar 19 / Jupiter 2 Coverage Area Depiction



The following page provides a depiction of the CONUS Echostar 19 / Jupiter 2 coverage area applicable to the Row 44 Ka
Antenna.


                                Cuouledse 7/
                                          rmeco
                                      2

                                    30
                                             es




                                                             w
                                                             m cce
                                                  Crensies
                                                                 o         e

                  e    f   "C         cicn
             iC   k 32          B   Cocoro
pele                :               HErpeneton
Meeoineedo                                                    Eyea2520 08 mc


                                                   Attachment 7

                       Echostar 19 / Jupiter 2 Gateway Call Locations and Signs


Row 44 proposes to communicate using the existing gateway earth stations set forth in the chart below, all of which are
currently licensed to HNS License Sub, LLC (Hughes) by the International Bureau, under the call signs listed.



                              Call Sign                                        Location
                              E150076                                         Gilbert AZ
                              E150077                                       Cheyenne WY
                              E150078                                        Duluth MN
                              E150079                                       Roseburg OR
                              E150080                                      North Platte NE
                              E150081                                         Seattle WA
                              E150082                                       Bismarck ND
                              E150083                                        Amarillo TX
                              E150084                                     Albuquerque NM
                              E150085                                        Bellevue NE
                              E150086                                         Lindon UT
                              E150087                                      Santa Clara CA
                              E150088                                       San Diego CA
                              E150089                                    North Las Vegas NV
                              E150090                                          Boise ID
                              E150091                                       Missoula MT
                              E150092                                        Billings MT


                                  Attachment 8
                      Radiation Hazard Analysis – Ka Antenna


Introduction

This exhibit constitutes the Radiation Hazard Analysis for Row 44’s Ka transmitter
considering the FCC procedure outlined in FCC Bulletin #65. The limit for exposure to
RF energy, (frequencies greater than 1.5 GHz), is 5 mW/cm2 up to a 6 minute duration
(categorized as Occupational / ’Controlled Exposure’), and 1 mW/cm2 up to a 30 minute
duration (categorized as General Population / ‘Uncontrolled Exposure’).1
Analysis regarding radiation exposure is presented considering behavior in the Near
Field, Far Field and Transition ‘regions’. Appropriate separation-distances are provided
for the ‘Controlled’ and ‘Uncontrolled Exposure’ scenarios, considering individuals
located in the direction of either the antenna’s main beam or its side-lobes.

Analysis
The extent of the Near Field region in the main beam is defined as distances out to a
radius Rnf according to the relation

        Rnf = D2/4

where D is the antenna panel width and  is the transmit wavelength.

The Near Field maximum Power Density, Snf, is determined from

        Snf = 0.1 PPA/A (in mW/cm2)

where PPA is the transmit power (after cable losses), A is the surface area of the antenna
aperture, and  the efficiency of the antenna aperture. (With an antenna height h, the
surface area A = Dh.)

The Far Field region for the main beam is defined as beginning and continuing out-from
a radius Rff , given by

        Rff = 0.60 D2/



1
 “Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency
Electromagnetic Fields,” Federal Communications Commission, Office of Engineering and Technology,
Bulletin 65, Fourth Edition, August, 1999, p.15.
http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf

                                                 1


The Far Field Power Density Sff at the Far Field radius and farther is determined (in terms
of the EIRP, denoted by PEIRP) from

       Sff = PEIRP/4 Rff2 (in mW/cm2)

(The value of PEIRP should already consider coax losses and aperture efficiency.)

Note that when the radius is expressed in meters, the Power Density is in units of W/m2.
The results are converted to units consistent with the FCC limits (mW/cm2) by
multiplying values in W/m2 by 0.1.


Exposure from the Main Antenna Beam

Row 44’s antenna has dimensions D = 0.617 m, h = 0.161 m, and a surface area A =
0.099 m2. At the highest transmit frequency of 30.0 GHz, the wavelength is 0.010 m.
The Near Field radius is then

Rnf = 9.52 m

The antenna aperture efficiency factor is 0.64 and the total added losses are 6.80 dB.

Based on the wavelength and panel-width given farther above, the Far Field radius is then

Rff = 22.84 m

In the operation of Row 44’s system, the antenna may be driven with various TX signal
levels, as regulatorily-authorized, based on the prevailing value of antenna skew.
Starting from the Ka maximum TX power of 44 dBm, and working-down in 0.5 dB
increments, Tables 1 provides the associated Near Field radius Power Density values:

       Table 1 Transmit Power and Near Field Power Density at Distance Rnf

  Transmit power (dBm)                 EIRP (dBW)                    Snf (mW/cm2)
              44                            46.2                          11.495
             43.5                           45.7                          10.245
              43                            45.2                           9.130
             42.5                           44.7                           8.138
              42                            44.2                           7.253
             41.5                           43.7                           6.464
              41                            43.2                           5.761
             40.5                           42.7                           5.134
              40                            42.2                           4.576
             39.5                           41.7                           4.078
              39                            41.2                           3.635
             38.5                           40.7                           3.240
              38                            40.2                           2.887
             37.5                           39.7                           2.573
              37                            39.2                           2.293
             36.5                           38.7                           2.044
              36                            38.2                           1.822


                                             2


            35.5                           37.7                           1.624
             35                            37.2                           1.447
            34.5                           36.7                           1.290
             34                            36.2                           1.149
            33.5                           35.7                           1.024


(Note that the equation for the maximum Power Density in the Near Field considers a
given radiated signal/ power confined-to and passing-through a physical area
corresponding to that of the antenna aperture. Along these lines, the Snf values cannot be
assumed to vary with distance from the antenna, for locations within the Near Field.)

The associated Far Field radius Power Density values are provided in Table 2:

   Table 2 Transmit Power, EIRP and Far Field Power Density at Distance Rff
  Transmit power (dBm)         EIRP (dBW)                 Sff (mW/cm2)
             44                            46.2                           0.6358
            43.5                           45.7                           0.5667
             43                            45.2                           0.5051
            42.5                           44.7                           0.4501
             42                            44.2                           0.4012
            41.5                           43.7                           0.3576
             41                            43.2                           0.3187
            40.5                           42.7                           0.2840
             40                            42.2                           0.2531
            39.5                           41.7                           0.2256
             39                            41.2                           0.2011
            38.5                           40.7                           0.1792
             38                            40.2                           0.1597
            37.5                           39.7                           0.1423
             37                            39.2                           0.1269
            36.5                           38.7                           0.1131
             36                            38.2                           0.1008
            35.5                           37.7                           0.0898
             35                            37.2                           0.0800
            34.5                           36.7                           0.0713
             34                            36.2                           0.0636
            33.5                           35.7                           0.0567




We are considering exposure to two values of Power Density: 5 mW/cm2 and 1 mW/cm2.

5 mW/cm2 Analysis

Some of the Snf values in Table 1 are greater than 5 mW/cm2, and some are less than 5
mW/cm2. As the Near Field analysis assumes that the Power Density in the Near Field
does not vary with distance, for cases where Snf exceeds 5 mW/cm2, there is no location
in the Near Field where the Power Density is less. An individual therefore cannot be
located in the Near Field anywhere whatsoever at all to avoid such an exposure level.

Assuming that the Power Density decreases linearly between the Near Field radius and
the Far Field radius, the distances at which the Power Density will equal 5 mW/cm2 are
given in Table 3. For cases where the ‘apparent’ distance where 5 mW/cm^2 is


                                            3


encountered would be closer than Rnf, the value of Rnf itself is adopted as a
precautionary measure.

         Table 3 Separation for ‘Controlled Exposure’ Limit (Main Beam)
     Transmit power (dBm)        Separation for ‘Controlled’ Limit (5 mW/cm2)
                                   meters                        feet
                44                      17.49                        57.37
               43.5                     16.74                        54.91
                43                      15.90                        52.16
               42.5                     14.96                        49.07
                42                      13.90                        45.60
               41.5                     12.71                        41.70
                41                      11.38                        37.34
               40.5                      9.89                        32.44
                40                       9.52                        31.22
               39.5                      9.52                        31.22
                39                       9.52                        31.22
               38.5                      9.52                        31.22
                38                       9.52                        31.22
               37.5                      9.52                        31.22
                37                       9.52                        31.22
               36.5                      9.52                        31.22
                36                       9.52                        31.22
               35.5                      9.52                        31.22
                35                       9.52                        31.22
               34.5                      9.52                        31.22
                34                       9.52                        31.22
               33.5                      9.52                        31.22




1 mW/cm2 Analysis

As the Snf values are each greater than 1 mW/cm2, we need consider distances greater
than Rnf where the 1 mW/cm2 will be encountered:

The EIRP and the resulting Far Field Power Density at distance Rff are once again
provided in Table 4 for each transmit power value:

   Table 4 Transmit Power, EIRP and Far Field Power Density at Distance Rff
  Transmit power (dBm)         EIRP (dBW)                 Sff (mW/cm2)
             44                             46.2                             0.6358
            43.5                            45.7                             0.5667
             43                             45.2                             0.5051
            42.5                            44.7                             0.4501
             42                             44.2                             0.4012
            41.5                            43.7                             0.3576
             41                             43.2                             0.3187
            40.5                            42.7                             0.2840
             40                             42.2                             0.2531
            39.5                            41.7                             0.2256
             39                             41.2                             0.2011
            38.5                            40.7                             0.1792
             38                             40.2                             0.1597
            37.5                            39.7                             0.1423
             37                             39.2                             0.1269


                                                4


            36.5                           38.7                             0.1131
             36                            38.2                             0.1008
            35.5                           37.7                             0.0898
             35                            37.2                             0.0800
            34.5                           36.7                             0.0713
             34                            36.2                             0.0636
            33.5                           35.7                             0.0567




Notice that no Sff values exceed 1 mW/cm2. For all the TX levels, we therefore need
interpolate the Power Density values between Rnf and Rff to project the location at which
1 mW/cm2 exists.

Assuming that the Power Density decreases linearly between the Near Field radius and
the Far Field radius, the distances at which the Power Density equals 1 mW/cm2 are
projected according to Table 5.


       Table 5 Separation for ‘Uncontrolled Exposure’ Limit (Main Beam)
    Transmit power (dBm)        Separation for ‘Uncontrolled’ Limit (1 mW/cm2)
                                   meters                        feet
                44                     22.39                        73.47
               43.5                    22.24                        72.98
                43                     22.08                        72.43
               42.5                    21.89                        71.81
                42                     21.68                        71.12
               41.5                    21.44                        70.34
                41                     21.17                        69.47
               40.5                    20.87                        68.49
                40                     20.54                        67.39
               39.5                    20.16                        66.15
                39                     19.74                        64.77
               38.5                    19.27                        63.21
                38                     18.74                        61.47
               37.5                    18.14                        59.52
                37                     17.47                        57.32
               36.5                    16.72                        54.86
                36                     15.88                        52.10
               35.5                    14.93                        49.00
                35                     13.87                        45.52
               34.5                    12.69                        41.62
                34                     11.35                        37.24
               33.5                     9.85                        32.33




                                               5


Exposure from Antenna Beam Side-Lobes

The previous calculations assumed the individual was located in the ‘sight’ of the main
antenna beam. (The ‘widest’ portion of the main antenna beam, i.e., in the elevation
plane, is approximately 3.4 degrees.) The following analysis provides insight into the
exposure when an individual is located to-the-side or behind the antenna.

Table 6 provides Power Density values at distances Rnf and Rff when an individual is
located in the direction of the highest-possible antenna side-lobe (which corresponds to a
20 dB gain reduction from the main beam).

   Table 6 TX Power, Sidelobe Attenuation, and Power Density at Rnf and Rff
   Tx power (dBm)       Sidelobe (dB)       Snf (mW/cm2)        Sff (mW/cm2)
           44                      -20                  0.1149                 0.0064
          43.5                     -20                  0.1024                 0.0057
           43                      -20                  0.0913                 0.0051
          42.5                     -20                  0.0814                 0.0045
           42                      -20                  0.0725                 0.0040
          41.5                     -20                  0.0646                 0.0036
           41                      -20                  0.0576                 0.0032
          40.5                     -20                  0.0513                 0.0028
           40                      -20                  0.0458                 0.0025
          39.5                     -20                  0.0408                 0.0023
           39                      -20                  0.0363                 0.0020
          38.5                     -20                  0.0324                 0.0018
           38                      -20                  0.0289                 0.0016
          37.5                     -20                  0.0257                 0.0014
           37                      -20                  0.0229                 0.0013
          36.5                     -20                  0.0204                 0.0011
           36                      -20                  0.0182                 0.0010
          35.5                     -20                  0.0162                 0.0009
           35                      -20                  0.0145                 0.0008
          34.5                     -20                  0.0129                 0.0007
           34                      -20                  0.0115                 0.0006
          33.5                     -20                  0.0102                 0.0006


As is obvious, neither the Snf or Sff values (at distances Rnf and Rff) exceed even the
‘Uncontrolled’ Limit of 1 mW/cm2. Therefore, no minimum distance of separation will
apply for individuals located in directions outside the antenna’s main beam.

Summary
This document presents the radiation hazard analysis for Row 44’s transmitter
transmitting at various EIRP values between 46.2 and 35.7 dBW. Considering the worst-
case (46.2 dBW), individuals positioned in the direction of the main beam of the antenna,
and in a ‘Controlled Exposure’ environment should be at least 17.49 meters (57.37 feet)
away from the antenna aperture (for a 6 minute duration). Under the same circumstances,
individuals in an ‘Uncontrolled Exposure’ environment should be at least 22.39 meters
(73.47 feet) away from the antenna aperture (for a 30 minute duration).

For individuals located in directions which are outside the antenna’s main beam, no
minimum distance of separation is applicable.

                                            6



Document Created: 2017-06-22 15:23:21
Document Modified: 2017-06-22 15:23:21

© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC