Supporting images for correspondence response

0163-EX-CN-2019 Images

Alliant Techsystems LLC.


                                                          Northrop Grumman Innovation Systems
                                                            Alliant Techsystems Operations LLC.
                                                                              4700 Nathan Lane
                                                                            Plymouth, MN 55442

Nimesh Sangani
Federal Communications Commission
Experimental Radio Services
P.O.Box 358320
Pittsburg, PA 15251-5320

Mr. Sangani,

Below is Northrop Grumman Innovation Systems’ Alliant Techsystems Operations
response to your questions dated April 16, 2019.

   1) What is the size of the proposed antenna(s)? If there is no call sign and IBFS file no. for the
      proposed antenna(s), please submit antenna’s pattern performances

       Two antennas are used in our testing. One mounted on the projectile (mobile
       station) and one at the fixed station to receive data from the projectile.

       Mobile antenna has a peak gain of 5.4dB and the pattern is shown in figures 3
       and 4, fixed antenna has a peak gain of 34dB and the pattern is shown in figures
       1 and 2.

                        4700 Nathan Lane, Plymouth, MN 55442    •   763-744-5272

Figure 1 - Fixed Antenna Horizontal Pattern

 Figure 2 - Fixed Antenna Vertical Pattern

                                Figure 3 - Mobile Antenna (E Plane)

                                Figure 4 - Mobile Antenna (H Plane)

2) Please submit a radiation hazard of the proposed antennas if there is no call sign and IBFS file

    Radiation hazard calculations were performed using an online “Amateur Radio RF Safety
    Calculator” ( and shown in figure 5. Only the Fixed
    Station was analyzed, as the mobile station is very low power and is only active for a very short
    period of time.

    Existing safety zones for this experiment (several thousand meters) are considerably larger than
    the calculated RF hazard zone.

                               Figure 5 - RF Safety Hazard Results

3) Please provide Point of communication: (i.e. specify an authorized GSO Ku-band or NGSO Ku-
   band satellites or both, and then provide call sign for each satellite)

   No satellite communications are part of this experiment. Communications are
   exclusively between the fixed and mobile (projectile / bullet) stations described in
   the experimental license request.

   This experiment is testing communications between a bullet in flight (mobile
   station) and a fixed receiver station.

   Communications are only active for the time of flight of the projectile (under 1
   second) during each test.

   Target area and firing position are at similar elevations. Antenna will be pointed
   directly at the target position (due west, 270 degrees) with zero incline from

4) If the proposed satellite is NGSO satellite, please demonstrate that your proposed operations in
   the 11.7-11.8 GHz band will meet the power Flux-density limits in Article 21 of the ITU Radio
   Regulations and the equivalent power Flux-density limits in Article 22 of the ITU Radio

   No satellite communications are part of this experiment. See response for
   question number three (3).

5) Please certify that your proposed operations and communication between earth stations and
   satellites are in compliance with all existing or future coordination agreements between the
   proposed satellite operators and other administrations, GSO and NGSO satellite operators.

   No satellite communications are part of this experiment. See response for
   question number three (3).

Northrop Grumman Innovation Systems’ Armament Systems strives to minimize any
interference from our testing and will accept a lower power limit if deemed necessary by
the FCC for issuance of this license.


                                           Mark Turpin, Sr. Principal Electrical Engineer
                                               Northrop Grumman Innovation Systems
                                                                    Armament Systems

Document Created: 2019-05-07 11:01:39
Document Modified: 2019-05-07 11:01:39

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