TETRA in Tunnels - Anthony Sutton
TETRA in Tunnels - Anthony Sutton
TETRA in Tunnels - Anthony Sutton
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Simple Road Tunnel CoverageDownl<strong>in</strong>k Signalstrength at Car =(+20dBm - longitud<strong>in</strong>alloss) – coupl<strong>in</strong>g loss:(+20 – 20dB(1000mtrs) – 75+40dBm-75dBm-75dBm100dB Free Space Loss (>5km @UHF)-60dBm= -75dBm at carantenna0dBm1km = 20dB Loss typLongitud<strong>in</strong>al Loss dB / km+20dBm+25dBm-35dBm-35dBm-55dBmCoupl<strong>in</strong>g Loss @ 95%: Typical 75dBCoupl<strong>in</strong>g loss 50% / 95% at distance 2m / 6m(75dB typical)-75dBmGa<strong>in</strong> 80dBTypical RX Sens = -113dBmTypical TX Pwr = +40dBmCar mobile transmit = +35dBmSlide 10
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