Exhibit 2 Link Budgets

0075-EX-CN-2018 Text Documents

BlackSky Global, LLC

2018-01-29ELS_203981

BlackSky Global LLC Exhibit 2 Link budgets The table below shows the link budgets for transmissions from the ground station to the Global-1 satellite. There are two uplink channels: a low-rate uplink at 450.2 MHz (UHF), and a higher-date rate uplink at 2071.875 MHz (S-band). The UHF ground antenna is a yagi antenna, and the S-band ground antenna is a parabolic antenna. For the S-band uplink, different size antennas are used at each site. At the North Pole, AK, ground station, a 7.3 m parabolic antenna is used. A 9.1 m parabolic antenna is also available as a backup at the same location, and will only be used in the event that the 7.3 m goes offline. At the Invercargill, New Zealand site, a 3.7 m antenna is used. Thus at each site, there is a different combination of RF output power and antenna gain that achieve the desired EIRP. These parameters are given in the tables below. This link budget assumes 550 km mean orbit altitude and a 5 degree elevation above the horizon. Note that the system was designed to operate in orbits up to 600 km altitude, hence the high margins. Table 1. Link Budget Parameter for Uplink UHF Uplink S-band uplink Unit Circular Altitude 550 550 km Elevation from Ground Station 5 5 deg Resulting slant range 2,205.9 2,205.90 km Center Frequency 450.2 2071.875 MHz GS Transmit power 13.0 See table 2 dBW GS Antenna gain 12.7 See table 2 dBi Expected Line Loss 2.9 See table 2 dB GS EIRP 22.8 43.0 dBW Isotropic Signal level at Spacecraft -132.3 -125.6 dBW Spacecraft Antenna Gain -5 6 dBi Spacecraft Expected Losses 0.9 2.3 dB Spacecraft G/T -31.7 -22.4 dB/K Effective data rate (post-FEC) 19.2 153.6 kbps Resulting Eb/No 21.8 28.7 dB Specified bit error rate 1.0E-05 1.0E-05 - Required Eb/No 10.6 10.6 dB Resulting Link Margin 11.2 18.1 dB Table 2. EIRP components per location Alaska Alaska S-band S-band New Zealand uplink, 7.3 m uplink, 9.1 m S-band antenna antenna Parameter for each ground station uplink (primary) (backup) Unit GS Transmit power 11.0 -0.4 -2.0 dBW GS Antenna gain 34.4 41.0 42.6 dBi Expected Line Loss 2.4 2.4 2.4 dB GS EIRP 43.0 43.0 43.0 dBW


Document Created: 2018-01-24 10:17:57
Document Modified: 2018-01-24 10:17:57
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