Exhibit 4

0157-EX-CM-2017 Text Documents

SRC, Inc.

2017-06-29ELS_194492

Exhibit 4: GPS Link Budget Calculations FCC File Number: 0157-EX-CM-2017 Satellite to Ground Link Budget GPS Satellite Link Budget (Down Link) GPS Satellite Downlink Power Frequency L1 1575.42 MHz Satellite Transmitter power 25 Watts 13.98 dBW RF Losses in transmitter path 1.25 dB Antenna Gain (Isotropic) 13.5 dBi Satellite Effective Radiated Power 26.23 dBW Propagation Losses Frequency L1 1575.42 MHz 1.58E+09 Hz Distance from Satellite to Earth 2.52E+07 Meters 2.52E+04 Kilometers Atmospheric and polarization loss 0.05 dB Speed of Light 3.00E+08 M/Sec Wavelength (C/F) 1.90E-01 Meters Free Space Pathloss 184.43 dB Received Power on Earth -158.25 dBW -128.25 dBm Power At Receive Antenna on Earth Received Power on Earth -158.25 dBW -128.25 dBm

Indoor Link Budget Receive antenna to Re-radiating Antenna Indoor Link Budget (Receive antenna to Re-radiating Antenna Location: Chantilly Room 11 Frequency L1 1575.42 MHz ANT-1 Antenna Receive Gain 38 dBic RF Cable Loss (from Receive Antenna to Amplifier Input) 3.3 dB LA-1 Line Amplifier Gain (Variable 0 - 30 dBm) 16 dB RF Cable Loss (from Amplifier to Amplified Splitter Input) 0.1 dB AS-1 Amplified Splitter Port 1 Gain 3 dB RF Cable Loss (from Amplifier to Passive Antenna) 5.1 dB Additional Attenuation 0 dB RF Power at input to Re-radiating antenna -79.75 dBm ANT-2 Passive Re-Radiating Antenna Gain 4 dB Re-radiated ERP Indoors -75.75 dBm Pathloss Target Distance 100 ft 30.480 meters Pathloss at 100 ft 66.08 dB RF Power Level at 100 ft from antenna -141.82 dBm Required RF Power Level at 100 ft -140 dBm/24 MHz Indoor Link Budget (Receive antenna to Re-radiating Antenna Location: Chantilly Room 13 Frequency L1 1575.42 MHz ANT-1 Antenna Receive Gain 38 dBic RF Cable Loss (from Receive Antenna to Amplifier Input) 3.3 dB LA-1 Line Amplifier Gain 16 dB RF Cable Loss (from Amplifier to Amplified Splitter Input) 0.1 dB AS-1 Amplified Splitter Port 2 Gain 3 dB RF Cable Loss (from Amplifier to Passive Antenna) 5.9 dB Additional Attenuation 0 dB RF Power at input to Re-radiating antenna -92.30 dBm ANT-3 Passive Re-Radiating Antenna Gain 4 dB Re-radiated ERP Indoors -88.30 dBm Pathloss Target Distance 100 ft 30.480 meters Pathloss at 100 ft 66.08 dB RF Power Level at 100 ft from antenna -154.38 dBm Required RF Power Level at 100 ft -140 dBm/24 MHz 2

Indoor Link Budget (Receive antenna to Re-radiating Antenna Location: Chantilly Room 69 Frequency L1 1575.42 MHz ANT-1 Antenna Receive Gain 38 dBic RF Cable Loss (from Receive Antenna to Amplifier Input) 3.3 dB LA-1 Line Amplifier Gain 16 dB RF Cable Loss (from Amplifier to Amplified Splitter Input) 0.1 dB AS-1 Amplified Splitter Port 3 Gain 3 dB RF Cable Loss (from Amplifier to Passive Antenna) 11.8 dB Additional Attenuation 0 dB RF Power at input to Re-radiating antenna -98.20 dBm ANT-4 Passive Re-Radiating Antenna Gain 4 dB Re-radiated ERP Indoors -94.20 dBm Pathloss Target Distance 100 ft 30.480 meters Pathloss at 100 ft 66.08 dB RF Power Level at 100 ft from antenna -160.28 dBm Required RF Power Level at 100 ft -140 dBm/24 MHz 3


Document Created: 2017-06-29 08:33:44
Document Modified: 2017-06-29 08:33:44
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