FEDERAL COMMUNICATIONS COMMISSION
APPLICATION FOR SPECIAL TEMPORARY AUTHORITY

Applicant Name
Name of Applicant:  Sierra Space Corporation

Address
Attention: Angela Maimo
Street Address: 2000 S Taylor Av
P.O. Box:
City: Louisville
State: CO
Zip Code: 80027
Country:
E-Mail Address: angela.maimo@sierraspace.com

Best Contact
Give the following information of person who can best handle inquiries pertaining to this application:  
Last Name: Maimo
First Name: Angela
Title: System Engineer
Phone Number: 7206924540

Explanation
Please explain in the area below why an STA is necessary:
Sierra Space Corporation (SSC) will operate the Dream Chaser spacecraft as part of the NASA Commercial Resupply Services phase 2(CRS2) program. The Dream Chaser mission will include launch, fairing separation, orbit raising maneuvers, approach and berthing with the International Space Station (ISS), unberthing and departure from the ISS, orbit maneuvering, reentry into the Earths atmosphere, and landing at the shuttle landing facility (SLF) near Kennedy Space Center in Florida. Reentry is anticipated to be a few days after separation from the ISS. Spacecraft telemetry is transmitted during all phases of mission operations. An STA is requested for the Dream Chaser spacecraft at the direction of NASA and the NTIA due to the short duration of the mission and the need for close coordination within the necessary frequency bands. See also application file number 0765-EX-ST-2024 which was the basis of grant call sign WX9XJC herein incorporated by reference.

Purpose of Operation
Please explain the purpose of operation:  This application seeks to allow further testing due to unforeseen delays which have led to a new launch date in May 2025. Tow/taxi test demonstration of multi-system performance over a range of speeds and braking profiles of the Dream Chaser spacecraft. The tow/taxi test demonstrates multi-system performance over a range of speeds and braking profiles by towing the UDC down the runway at the Shuttle Landing Facility (SLF) at Kennedy Space System (KSC) to a test case specific speed and releasing the UDC such that it controls itself and brakes to a stop. Spacecraft telemetry links for monitoring of Dream Chaser spacecraft state of health. Telemetry links include: 1) S-Band Single Access (SSA) spread spectrum return link operation with NASA TDRS; 2) High data rate downlink operation with mission Ground Stations; and 3) a Dream Chaser to ISS link for proximity operations will be used during the mission. The transmitters supporting these links are described below: The Dream Chaser spacecraft configuration will include two L-3 Cincinnati Electronics (nowL3Harris) transceivers (primary & redundant-backup) operating at 2287.5 MHz in TDRS spread spectrum (SQPN) mode to provide a telemetry return link through TDRS at 36, 144, or 288 ksps; or in TDRS SQPSK mode to provide a telemetry downlink to mission Ground Stations at 1 Msps. Two additional transceivers (primary & redundant backup), also procured from L3Harris, operating at 2203.2 MHz in SQPN mode to provide a telemetry return link at 36 or 144ksps, will be used for the Dream Chaser to ISS proximity communication link. See also STA file number 0660-EX-ST-2024.

Information
Callsign: WX9XJC
Class of Station: MO
Nature of Service: Experimental

Requested Period of Operation
Operation Start Date: 12/01/2024
Operation End Date: 05/30/2025

Manufacturer
List below transmitting equipment to be installed (if experimental, so state) if additional rows are required, please submit equipment list as an exhibit:  
Manufacturer Model Number No. Of Units Experimental
L3-CE (L3Harris) 696400-301 2 No
L3-CE (L3Harris) 696400-201 2 No
DKM (Dow-Key Microwave) H9064 1 No
Mercury MRC-IMAS-105-S 6 No
Mercury DM-MUXS-CA-108S 6 No
MDA 896137-551 6 No

Certification
Neither the applicant nor any other party to the application is subject to a denial of Federal benefits that includes FCC benefits pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. Section 862, because of a conviction for possession or distribution of a controlled substance. The applicant hereby waives any claim to the use of any particular frequency or electromagnetic spectrum as against the regulatory power of the United States because of the prvious use of the same, whether by license or otherwise, and requests authorization in accordance with this application. (See Section 304 of the Communications Act of 1934, as amended.) The applicant acknowledges that all statements made in this application and attached exhibits are considered material representations, and that all the exhibits part hereof and are incorporated herein as if set out in full in this application; undersigned certifies that all statements in this application are true, complete and correct to the best of his/her knowledge and belief and are made in good faith. Applicant certifies that construction of the station would NOT be an action which is likely to have a significant environmental effect. See the Commission's Rules, 47 CFR1.1301-1.1319.
Signature of Applicant (Authorized person filing form): Angela Maimo
Title of Applicant (if any): Senior Engineer
Date: 2024-11-01 00:00:00.0

Station Location
City State Latitude Longitude Mobile Radius of Operation
Merritt Island Florida North  28  36  50 West  80  41  37 Kennedy Space Center SLF runway, FL 2.30
Datum:  NAD 83
Is a directional antenna (other than radar) used?   No
Exhibit submitted:   No
(a) Width of beam in degrees at the half-power point:  
(b) Orientation in horizontal plane:  
(c) Orientation in vertical plane:  
Will the antenna extend more than 6 meters above the ground, or if mounted on an existing building, will it extend more than 6 meters above the building, or will the proposed antenna be mounted on an existing structure other than a building?   No
(a) Overall height above ground to tip of antenna in meters:  
(b) Elevation of ground at antenna site above mean sea level in meters:  
(c) Distance to nearest aircraft landing area in kilometers:  
(d) List any natural formations of existing man-made structures (hills, trees, water tanks, towers, etc.) which, in the opinion of the applicant, would tend to shield the antenna from aircraft:
Action Frequency Station Class Output Power/ERP Mean Peak Frequency Tolerance (+/-) Emission Designator Modulating Signal
New 2203.20000000- MHz MO 4.897790 W 30.158000 W P 0.00000300 % 3M46G1D SQPN, 36 ksps
Action Frequency Station Class Output Power/ERP Mean Peak Frequency Tolerance (+/-) Emission Designator Modulating Signal
New 2203.20000000- MHz MO 4.897790 W 30.158000 W P 0.00000300 % 3M46G1D SQPN, 144 ksps
Action Frequency Station Class Output Power/ERP Mean Peak Frequency Tolerance (+/-) Emission Designator Modulating Signal
New 2287.50000000- MHz MO 394.457000 mW 2.610959 W P 0.00000300 % 583KG1D SQPSK
Action Frequency Station Class Output Power/ERP Mean Peak Frequency Tolerance (+/-) Emission Designator Modulating Signal
New 2287.50000000- MHz MO 3.701690 W 24.502000 W P 0.00000300 % 3M59G1D SQPN, 36 ksps
Action Frequency Station Class Output Power/ERP Mean Peak Frequency Tolerance (+/-) Emission Designator Modulating Signal
New 2287.50000000- MHz MO 11.259000 W 74.524660 W P 0.00000300 % 3M59G1D SQPN, 144 ksps
Action Frequency Station Class Output Power/ERP Mean Peak Frequency Tolerance (+/-) Emission Designator Modulating Signal
New 2287.50000000- MHz MO 26.211990 W 147.434800 W P 0.00000300 % 3M59G1D SQPN, 288 ksps