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Microwave performance evaluated by signals received from the beacons at Shiphol Airport PI7EHG :
Measurements done on a nice "dry" day 20010421

 PA5DD (JO22IC22) 2320 MHz 3400 MHz 5760 MHz 10368 MHz 24192 MHz PI7EHG/B (JO22JH14) EIRP +40 dBm +39 dBm +49 dBm +32 dBm +26 dBm Path gain (25km) -99 dB -99 dB -99 dB -99 dB -99 dB = Power density at RX antenna - 59 dBm/m² - 60 dBm/m² - 50 dBm/m² - 67 dBm/m² - 73 dBm/m² RX antenna aperture (ideal) - 4 dB/m² - 4 dB/m² - 4 dB/m² - 4 dB/m² - 7.5 dB/m² = Power at RX input -63 dBm -64 dBm -54 dBm -71 dBm -80.5 dBm Noisefloor @3kHz,290K,NF=0dB -139 dBm -139 dBm -139 dBm -139 dBm -139 dBm <> Ideal free space S/N@3kHz 76 dB 75 dB 85 dB 68 dB 58.5 dB Measured S/N@3kHz 60 dB 60 dB 55 dB 56 dB 39 dB <> Difference ideal to measured 16 dB 15 dB 30 dB 12 dB 19.5 dB

 Calculations Unit PI7EHG Beacon EIRP 10 * Log [power in mW] + TX antenna gain (dBi) dBm Path gain -10 * Log (4 * pi * [distance in meters]²) dB = Power density at RX antenna dBm/m² RX antenna aperture (ideal) 10 * Log (pi * [parabol radius in meters]²) dB/m² RX antenna gain [aperture in dB/m²] + 10 * Log ((4 * pi) / [wavelength in meters]²) dBi = Power at RX input dBm Noisefloor@3kHz,290K,NF=0dB 10 * Log [bandwidth in Hz] - 174 dBm/Hz dBm <> Ideal free space S/N@3kHz dB Measured S/N@3kHz dB <> Difference ideal to measured dB

Note: The values for ideal free space propagation assumes no losses by refraction, reflection or atmospheric losses. It also assumes ideal illumination of the receive antenna, no transmission loss between antenna and receiver, and finally assumes a receiver noise figure of 0dB. The values are only relevant for a relative comparision with the measured values.

Link to EIRP data for PI7EHG

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