EMC Analysis

0255-EX-CN-2018 Text Documents

Old Dominion University

2018-09-26ELS_216807

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 EMC Analysis for VCC Cubesats Introduction and Summary of Results The Virginia CubeSat Constellation (VCC) is a collaborative, student-led project, of four Virginia Universities: University of Virginia (UVA), Old Dominion University (ODU), Virginia Tech (VT), and Hampton University. Supported by NASA through the Virginia Space Grant Consortium as part of NASA Undergraduate Student Instrument Project (USIP) program, the project will launch three similar CubeSats into low Earth orbit from the International Space Station, and transmit data to ground stations on the UVA, ODU, and VT campuses for less than two years. The primary mission is to collect atmospheric data to improve deorbit predictions. Radio operating licenses have been requested from the FCC as follows: Lower frequency Center frequency Upper frequency Bandwidth [MHz] [MHz] [MHz] [kHz] UVA 401.030 401.040 401.050 20 ODU 401.070 401.080 401.090 20 VT 401.110 401.120 401.130 20 This report provides a domestic and international electromagnetic compatibility study with the existing users, as required by the FCC. The FCC OET and FCC International Bureau databases were searched, as were the ITU SNS and MIFR databases. These are documented in later sections of this report. Table 1 summarizes the identified relevant operators with whom coordination actions were taken, and the outcome of the coordination efforts. Details for each are provided in later sections of the report, and in Appendices at the end of the report. Operator Action Outcome NOAA GOES EMC Analysis Completed No objections, Coordination Complete, NOAA concurs with VCC analysis. VCC agrees to not more than 3 years of operation. National Radio Quiet Zone NRAO Evaluation No objections, Coordination Complete GHG Contacted GHG, supplied No objections, data. Coordination Complete Spire Contacted Spire No objections identified, Coordination in progress. Kepler Communication Contact Kepler No objections identified, Coordination in progress. Page 1 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 Power Flux Density at Earth Surface, In Band and Out of Band In the downlink (CubeSat to ground station) the Lithium-II radios with broad beam antennas will provide a transmit power of 3.9 W EIRP. According to AstroDev, the manufacturer of the radio, the roll off of the transmitting spectrum is:  -3 dB at 12 kHz;  -20 dB at 18 kHz;  -40 dB at 50 kHz;  -60 dB at 100 kHz. This is shown in the following figure: Converting the transmitting spectrum roll off in absolute units provides the following plot: Page 2 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 In the uplink (ground station to CubeSat), a Universal Software Radio Peripheral (USRP) B200 software defined radio from Ettus Research will be used with directional antennas and power amplifiers to deliver a transmit power of 13.98 dBW (25 W). A similar roll-off characteristic for the transmitting spectrum is assumed in the uplink, which can be easily implemented as a digital root-raised cosine (RRC) filter in the B200 USRP. Power Spectral Density Analysis Downlink: Considering the total power of the transmitting signal to be approximately uniformly distributed over the operating bandwidth of 20 kHz, this results in a power spectral density (PSD) of 1.9 W / 20 kHz = 79.49 x 10-5 W/Hz or -40.23 dBW/Hz. The out-of-band power of the transmitting signal is radiated through the 0 dBi CubeSat antenna mostly in the adjacent 20 kHz bandwidth to the left and to the right of the operating band. The out-of-band PSD at frequencies located beyond 100 kHz away from the carrier frequency is attenuated by 60 dB relative to the in-band frequencies resulting in an out-of-band PSD of -40.23 - 60 = -100.23 dBW/Hz for these frequencies. The out-of-band frequencies of the transmitted signal will be further attenuated by propagation pathloss from the VCC CubeSat orbiting in low Earth orbit at 400 km, to the GOES satellite orbiting in geosynchronous orbit at 35,768 km. The minimum value of the corresponding pathloss for 401 MHz band with a wavelength of 0.748 m is 175.48 dB, and corresponds to the minimum distance of 35,468 km between the VCC CubeSat and a GOES satellite. Thus, the out-of-band Page 3 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 PSD at a potential satellite receiver operating in a bandwidth that is 100 kHz away or more from the operating bandwidth of the CubeSat radio is -100.23 - 175.48 = -275.81 dBW/Hz, equivalent to -255.81 dBW per 100 Hz. Uplink: Considering that the in-band power of the transmitting signal is approximately uniformly distributed over the operating bandwidth of 20 kHz, this results in a power spectral density of 25 W / 20 kHz = 1.25 x 10-3 W/Hz or -29.03 dBW/Hz. The out-of-band power of the transmitting signal is radiated through a 13.80 dBi Yagi ground station antenna mostly in the adjacent 20 kHz bandwidth to the left and to the right of the operating band. The out-of-band PSD at frequencies beyond 100 kHz away from the carrier frequency is attenuated by 60 dB relative to the in-band frequencies resulting in an out-of-band PSD of 13.80 -29.03 - 60 = -75.23 dBW/Hz for these frequencies. The out-of-band frequencies of the transmitted signal will be further attenuated by propagation pathloss from the VCC ground station to the GOES satellite orbiting in geosynchronous orbit at 35,768 km, which for the 401 MHz band (0.748 m wavelength) is equal to 175.58 dB. Thus, the out-of-band PSD at a potential satellite receiver operating in a bandwidth that is 100 kHz away or more from the operating bandwidth of the CubeSat radio, is -75.23 - 175.58 = -250.81 dBW/Hz, which is also equivalent to -230.81 dBW per 100 Hz. The interference analysis calculations are summarized in the following table: Downlink Uplink CubeSat  Ground Station Ground station  CubeSat Peak transmit power [dBW] 2.80 13.98 In-band radiated PSD – 40.23 – 29.03 [dBW/Hz] Transmitting spectrum roll – 60.00 – 60.00 off at frequencies >100 kHz away from VCC bands [dB] Transmit antenna gain [dBi] 0 13.80 Path loss to DCS receiver –175.48 –175.58 [dB] Out-of-band PSD at DCS –275.81 –250.81 receiver [dBW/Hz] Interfering signal power at –255.81 –230.81 DCS receiver in reference bandwidth [dBW per 100 Hz] Page 4 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 Domestic Operator Search From the FCC OET and FCC International Bureau databases, lists of satellite systems using the 401 to 402 MHz band was collected and shown in Tables 1 and 2 below. None of these operations are expected to have interference for reasons cited in the Comments associated with each.. Table 1: OET Experimental Licensing System Files, 401 to 401.2 MHz Search Criteria: All Services, Frequency Range = 400.8 MHz through 401.7 MHz, Box Search: Start Coordinates = 24° 33' 18" N 81° 46' 43" W End coordinates=47° 36' 28" N 122° 20' 6" W, Currently Licensed and Pending Facilities OET Experimental Licensing System Database File Licensee: Issue Radio Callsign: WI Number: FRN: 00249 Expiration: 02/ Status: Gr Blue Date: 02/06 Service 2XSC 0039-EX- 40371 01/2019 anted Origin /2017 : XT CN-2017 Site Address: State: TX County: CULBERSON Mobile Coordinates: 31° 25' 23" N, 104° 45' 26" W Frequency: 401.20000000 M Comment: Experimental, out of Band File Licensee: Issue Radio Callsign: WJ Number: The FRN: 00015 Expiration: 04/ Status: Gr Date: 10/17 Service 9XNY 1452-EX- Boeing 83483 17/2018 anted /2017 : XT ST-2017 Company Site Address: Fixed Fixed Coordinates: 45° 44' Mobile Coordinates: 45° 44' operations within 1 kilometer State: OR 54" N 119° 47' 38" W 54" N, 119° 47' 38" W radius Frequency: 401.00000000 - 415.00000000 M Comment: Expired Site Address: State: WA Fixed Coordinates: 45° 42' 24" N 121° 27' 30" W Frequency: 401.00000000 - 415.00000000 M Comment: Expired Site Address: Boardman Bombing Mobile Coordinates: 45° 44' 54" N, 119° 47' 38" State: OR Range W Frequency: 401.00000000 - 415.00000000 M Comment: Expired File Licensee Issue Radio Callsign: WL Number: : The FRN: 00015 Expiration: 12/ Status: Gr Date: 06/05 Service 9XGW 0656-EX- Boeing 83483 06/2017 anted /2017 : XT ST-2017 Company Page 5 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 OET Experimental Licensing System Database Site Address: Fixed Fixed Coordinates: 45° 44' Mobile Coordinates: 45° 44' operations within 1 kilometer State: OR 54" N 119° 47' 38" W 54" N, 119° 47' 38" W radius Frequency: 401.00000000 - 415.00000000 M Comment: Expired Site Address: State: WA Fixed Coordinates: 45° 42' 24" N 121° 27' 30" W Frequency: 401.00000000 - 415.00000000 M Comment: Expired Site Address: Boardman Bombing Mobile Coordinates: 45° 44' 54" N, 119° 47' 38" State: OR Range W Frequency: 401.00000000 - 415.00000000 M Comment: Expired File Licensee Issue Radio Callsign: WL Number: : The FRN: 00015 Expiration: 06/ Status: Gr Date: 12/19 Service 9XGW 1646-EX- Boeing 83483 07/2018 anted /2017 : XT ST-2017 Company Site Address: Fixed Fixed Coordinates: 45° 44' Mobile Coordinates: 45° 44' operations within 1 kilometer State: OR 54" N 119° 47' 38" W 54" N, 119° 47' 38" W radius Frequency: 401.00000000 - 415.00000000 M Comment: Expired Site Address: State: WA Fixed Coordinates: 45° 42' 24" N 121° 27' 30" W Frequency: 401.00000000 - 415.00000000 M Comment: Expired Site Address: Boardman Bombing Mobile Coordinates: 45° 44' 54" N, 119° 47' 38" State: OR Range W Frequency: 401.00000000 - 415.00000000 M Comment: Expired Table 2: IB Licensing System Files, 401 to 401.2 MHz International Bureau Filing System Database Status: AT File Applicant: O Grant Callsign: E FRN: 0004 Expiration: 0 PN Sub- Number: SESMOD20 RBCOMM Date: 12/1 940536 379202 5/17/2020 System: S 13093000856 License Corp. 6/2013 ES Coordinates: 31° 30' 3" N, Site: 1 Description: CONUS City: OCILLA State: GA County: IRWIN 83° 11' 58" W Frequency: 00000137.00000000-00000401.00000000 Comment: Does not Overlap Page 6 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 International Bureau Filing System Database Status: AT File Applicant: O Grant Callsign: E FRN: 0004 Expiration: 0 PN Sub- Number: SESMOD20 RBCOMM Date: 12/1 940537 379202 5/17/2020 System: S 13093000854 License Corp. 7/2013 ES City: ST. Coordinates: 34° 27' 21" N, Site: 1 Description: CONUS State: AZ County: APACHE JOHNS 109° 33' 17" W Frequency: 00000137.00000000-00000401.00000000 Comment: Does not Overlap Status: AT File Applicant: O Grant Callsign: E FRN: 0004 Expiration: 0 PN Sub- Number: SESMOD20 RBCOMM Date: 12/1 940538 379202 5/17/2020 System: S 13093000855 License Corp. 6/2013 ES City: EAST Coordinates: 47° 33' Site: 1 Description: CONUS State: WA County: DOUGLAS WENATCHEE 4" N, 120° 10' 30" W Frequency: 00000137.00000000-00000401.00000000 Comment: Does not Overlap International Operator Search From the ITU Space Network Systems Online (SNS), a list of satellite systems using the 401 to 402 MHz frequency range is shown in Table 3. For each satellite system, the Comment column in the table indicates an assessment of the impact of the VCC CubeSats’ operation on the system. Table 3: List of Satellite Systems from ITU SNS, 401 to 401.2 MHz with USA, CAN or MEX ADM/ORG. BR Center Min Max Bandw Satellite ADM ITU ID IFC Freq. Freq. Freq. idth Status Comment Name ID (Mhz) (Mhz) (Mhz) (Khz) Coordination Complete; No CAN 113540650 GHGSAT-D 2773 402 401 403 2000 Active Expectation of Interference CSA and JAXA. On Hold CAN 108540431 JC2SAT 2640 402 401 403 2000 Active Indefinitely. Kepler Communications CAN 118545050 KELYPSIS 2871 401.5 401 402 1000 Active Coordination in Progress Inuvik Canada ground CAN 117545422 MULTUS 2874 401.075 400.15 402 1850 Active station beyond our footprint. No Impact. DORIS instrument, uses USA 108540735 OSTM 2682 401.245 400.25 402.24 1990 Active 401 as an auxiliary frequency Redmond Washington ARKYD-6A, ground station beyond our USA 117545411 2870 401.5 401.43 401.57 140 ARKYD-6B footprint, out of band. No Impact. SpaceX CRS UHF CUCU, ISS- Communication Unit on USA 110540475 2865 400.575 400.15 401 850 CUCU ISS; Beyond our footprint, out of band, No Impact USA 113540068 DOVE1 2759 401.3 401 402 1000 Demised No impact USA 113540069 DOVE2 2759 401.3 401 402 1000 Demised No impact Page 7 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 BR Center Min Max Bandw Satellite ADM ITU ID IFC Freq. Freq. Freq. idth Status Comment Name ID (Mhz) (Mhz) (Mhz) (Khz) USA 113540400 DOVE3 2766 401.3 401 402 1000 Demised No impact Was Never USA 113540401 DOVE4 2766 401.3 401 402 1000 No impact Deploye d USA 113540399 INSIGHT 2764 397.5 390 405 15000 None Note 1 USA 115545100 MARCO 2823 397.5 390 405 15000 None Note 1 USA 116545103 MARS 2020 2831 397.5 390 405 15000 None Note 1 USA MRO 405 405 405000 Note 1 USA MSL 410 410 410000 Note 1 Spire, coordination in USA 117545328 LEMUR-2-3 2867 401.5 401 402 1000 Active progress. USA 113540070 MER-R 2757 401.5856 401.4356 401.7356 300 Note 1, Out of Band USA 107540739 NPOESS 2831 402 401 403 2000 Inactive No impact USA 108540735 OSTM 2682 401.25 400.25 402.25 2000 Inactive No impact Pasadena CA ground station beyond our USA 117545438 RAINCUBE 2875 400.795 400.78 400.81 30 Active footprint. Out of band. No impact. Pasadena CA ground station beyond our USA 117545438 RAINCUBE 2875 401.15 401.135 401.165 30 Active footprint. Out of band. No impact. USASAT- USA 95540430 2842 401.5 401.47 401.53 60 Out of Band 30A Fairbank AK Ground USASAT- USA 113540648 2788 401.5 401 402 1000 Active station beyond our 30F footprint. No impact. USASAT- USA 117545385 NGSO- 2872 401.675 401.6 401.75 150 Out of Band ASTC-2 USA 113540040 USOCEAN 2757 401.25 401.2385 401.2615 23 Out of Band USA USPOJOQU 401.7455 401.512 401.979 467 Inactive No Impact E USA 112540309 UST4WP 2734 401.05 401.04676 401.05324 6.48 Entry 6 years old. Note 1: The Mars missions use highly directional ground based antennas and our satellites will transit quickly if at all, across these highly directional antennas, in roughly 4 seconds maximum. National Radio Quiet Zone Coordination The University of Virginia ground station in Charlottesville, VA, lies just inside the Eastern border of the National Radio Quiet Zone (NRQZ), so evaluation for impact on the operation of the National Radio Astronomy Observatory (NRAO) was required. The NRAO performed an evaluation, and found no concerns with the operation as planned. See Appendix 1 for correspondence supporting this. Page 8 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 NOAA Coordination NOAA conducts operations of the GOES system in the range of 401 to 402 MHz. Carmelo Rivera at NOAA was contacted, and an analysis of compatibility of VCC operations with NOAA operations, was provided. Mr. Rivera replied Sept. 12 that they will probably not have a problem with operation, and on September 24, he forwarded a letter from Fred Mistichelli, NESDIS. See Appendix 2 for correspondence showing their recommendations for concurrence with the VCC position of no interference. This recommendation is conditional on limiting the VCC activity to 3 years or less, which is compatible with our plan to operate for 2 years or less. GHG Coordination GHGSat operates in the range from 401 to 403 MHz. Carrie Rhoades at GHG was contacted, and she stated that there would be no impact on their operations. See Appendix 3 for a letter from GHG confirming this position. Spire Coordination Coordination discussions are ongoing with George John, Lead Legal & Regulatory Counsel Spire Global, Inc. See Appendix 4 for the latest communication from Spire. Kepler Coordination Kepler Communications operates in the range from 401 to 402 MHz. They have ground stations in Toronto, Canada; Svalbard, Norway; and New Zealand. VCC operation was reviewed with Nick Spina, Director Launch & Regulatory Affairs at Kepler Communications. His focus was on potential interference by VCC satellites transmissions, with the receiver at the Toronto ground station. Discussion ongoing. Conclusion There is no expectation at this time that VCC experimental satellite and US earth station operations will interfere with any known systems. Page 9 of 16

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VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 Appendix 2 Evaluation Letter from NOAA On Tue, 25 Sep 2018 08:47:17 -0400, Carmelo Rivera - NOAA Federal wrote: Mike, I concur. Regards, Carmelo On Mon, Sep 24, 2018 at 10:51 PM, Mike Miller <mlmiller@sterksolutions.com> wrote: Hi Carmelo, This is very positive I feel. Do you concur, as recommended by Fred / NESDIS? Thanks, Mike 415 385-3842 On Mon, 24 Sep 2018 08:44:36 -0400, Carmelo Rivera - NOAA Federal wrote: Please see the comments below and the recommendation from our satellite division. v/r, Carmelo ---------- Forwarded message ---------- From: Alfredo Mistichelli - NOAA Federal <alfredo.mistichelli@noaa.gov> Date: Mon, Sep 24, 2018 at 3:34 AM Subject: VCC 401-403 MHz interference analysis To: Carmelo Rivera - NOAA Federal <carmelo.rivera@noaa.gov> Cc: "Hall, Nathan T" <nhall@alionscience.com>, Al Wissman <Al.Wissman@noaa.gov> Carmelo, We have reviewed the technical specifications of the GOES-R UHF receiver in more detail, and made the following conclusions on the VCC coordination analysis: Page 11 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 Potential Impact to GOES DCS - Their interference analysis (attached), shows acceptable RFI impact to GOES DCS o The only issue is the GOES-R satellite receive antenna gain (13.8 dBi) was not included in their static calculations; however, that wouldn’t have a significant impact when you consider the frequency separation between the VCC signals and the GOES DCPR passband o Their analysis cites NOTE 1 within the ITU-R Recommendation SA.1164-2, which states, NOTE 1 – The single-entry interfering signal power thresholds in Table 1 are the permissible levels of interfering signal power that fall within the specified reference bandwidth. Accordingly, the total power in interfering signals that are narrower than the reference bandwidth should be considered in frequency sharing analyses.In cases where the interfering bandwidth exceeds the reference bandwidth or does not fully overlap the passband of a specific receiver under study, the available frequency dependent rejection should be applied in conjunction with the specified permissible interference levels. - Frequency separation between VCC signals (401.04/401.08/401.12 MHz) and the filter within the GOES DCPR receiver (401.7 – 402.4 MHz) is enough to ensure no potential for interference (see attached figure) - Regarding the potential for high levels of VCC interference signal power to drive GOES receiver LNAs into nonlinearity, we have confirmed there are no potential issues Given all of the above, if you do decide to concur with VCC, we plan to track this agreement (along with all other future agreements with 401-403 MHz smallsats) in order to continually evaluate the potential for aggregate interference to GOES DCS. Potential Impact to ARGOS - DCS system use on NGSO MetSat/EESS systems is allocated to the bands 401 – 401.2 MHz and 401.3 – 401.7 MHz (as stated in ITU-R Recommendation SA.2045) - The future NOAA Argos A-DCS satellite, scheduled for launch in FY2021, will use the 401 – 401.2 and 401.3 – 401.7 MHz bands Page 12 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 o Preliminary dynamic analyses, which evaluated the potential for interference from VCC uplinks/downlinks to the future Argos A-DCS links in 401 – 402 MHz, showed that the ITU- R Recommendation SA.2044 protection criteria is met  These analyses assumed VCC’s stated duty cycles for their uplinks/downlinks  Uplinks: 2 passes taken per day, average transmit time per pass of 1.6 minutes  Downlinks: 2 passes taken per day, average transmit time per pass of 6.6 minutes Given all of the above, there is concern that, should more and more smallsat constellations use the 401 – 401.2 and 401.3 – 401.7 MHz bands, by the time the Argos A-DCS satellite launches in 2021, the RF signal environment in those bands will have an adverse impact on the satellite’s operation. NESDIS Recommends we concur conditionally for a limited period of time, not to exceed 3 years, with conditions to not interfere with NOAA satellite operations. This should include stop buzzer POCs for the VCC missions (use me for the Gov side if you want). Due to the aggregate smallsat use of this band for smallsat TT&C it is recommended VCC transition out of the band by 2021. Please note the ITU-R Recommendations cite above are no longer drafts, and have been approved by SG7. They still need to go through the ITU comment period to Administrations before coming into in force status and published. Please call me if you’d like to discuss. -- Regards, Fred Mistichelli Electronics Engineer US Department of Commerce (DOC) National Oceanic and Atmospheric Administration (NOAA) National Environmental Satellite, Data and Information Service (NESDIS) Office of Chief Information Officer - Satellites (OCIO-S) 1335 East West Hwy, SSMC-1 (Rm. G1-101) Silver Spring, MD 20910-3283 (O) (301) 713-1647 (C) (202)-308-5016 Page 13 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 Appendix 3 GHGSAT Coordination Letter --------- Forwarded message --------- From: <carrie.herzog@ghgsat.com> Date: Fri, Sep 14, 2018 at 9:46 AM Subject: Re: FCC Frequency Coordination for VCC To: Erin Puckette <ep2hk@virginia.edu> Cc: Stephane Germain <stephane.germain@ghgsat.com>, Marcela Arias <mam@ghgsat.com>, Mike Miller <mlmiller@sterksolutions.com> Hi Erin, We have completed our analysis. We believe that your operations will not interfere with GHGSat's Operations. Given this information, we consider this coordination as complete. Thank you, Regards, Carrie Herzog Data Processing and Operations Specialist GHGSat Inc. 3981 St-Laurent, Suite 500 Montréal, QC H2W1Y5> Tel : +1-514-847-9474 x218 ---------------------------------------------------------------------------------------------------------------- CONFIDENTIALITY NOTICE - The information contained in this email and any attachment thereto is intended exclusively for the individual or entity to whom it is addressed and may be legally privileged and/or confidential. If you have received it by mistake, please delete it and notify immediately the sender. If you are not the addressee, you are hereby notified that you are not authorized to use copy or disseminate any information contained in this email. AVIS DE CONFIDENTIALITÉ - L'information transmise dans ce message et tout document qui lui est joint est strictement réservée à l'usage de son destinataire et peut contenir des renseignements assujettis au secret professionnel et/ou confidentiels. Si vous avez reçu ce courriel par erreur, nous vous prions de le détruire, de l'effacer de tout disque dur ou autre média sur lesquels il peut être enregistré, et d'en informer sans délai l'émetteur du message. Vous êtes par la présente avisé(e) que tout usage, copie ou distribution de l'information qu'il contient est strictement interdit. Page 14 of 16

VCC Cubesat Mission FCC Applications 0240-EX-CN-2018, 0252-EX-CN-2018, 0255-EX-CN-2018 Appendix 4 Latest Communications with Spire Global ---------- Forwarded message --------- From: George John <george.john@spire.com> Date: Tue, Sep 25, 2018 at 6:24 AM Subject: Re: UVA Cubesat Project - Licensing Coordination To: Erin Puckette <ep2hk@virginia.edu> Cc: Robert Sproles <robert.sproles@spire.com> Don't worry about it. We know it's a rigorous process! Talked to the engineering team and they are kindly requesting you submit the full spectral mask for uplink and downlink for the range of 150MHz -1700MHz. They also need to know your transmit duty cycle for both up and downlink. Thanks, George On Mon, Sep 24, 2018 at 7:56 PM Erin Puckette <ep2hk@virginia.edu> wrote: Hi George, Sorry for the delay, I've been at vibration testing. For the markers given, the spectral density will be insignificant for all but 402.7 MHz. The roll off value there would be on the order of -128.861 dB. Let me know if you need anything else. Erin Puckette Page 15 of 16


Document Created: 2018-09-25 23:09:28
Document Modified: 2018-09-25 23:09:28
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