+50dBm TX TPO: 100Watts (+50dBm) Start with a Transmitter.

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Presentation transcript:

+50dBm TX TPO: 100Watts (+50dBm) Start with a Transmitter

TX TPO: 100Watts (+50dBm) Line Loss -1dB Add some transmission line

TX TPO: 100Watts (+50dBm) Line Loss -1dB Antenna Gain +9dB And an antenna

TX TPO: 100Watts (+50dBm) Line Loss -1dB Antenna Gain +9dB Plus a radome for ice protection Radome Loss -.5dB

TX TPO: 100Watts (+50dBm) Line Loss -1dB Antenna Gain +9dB ERP: 57.5dBm (562Watts) Now compute the Effective Radiated Power Radome Loss -.5dB

TX TPO: 100Watts (+50dBm) Line Loss -1dB Antenna Gain +9dB Free Space Loss -109dB (44 miles on 155 MHz) Path Loss -50dB (Terrain obstructions, vegetation, buildings on path to this point) Compute losses to a receive location Radome Loss -.5dB

TX TPO: 100Watts (+50dBm) Line Loss -1dB Antenna Gain +9dB Free Space Loss -109dB Path Loss -50dB 17.3 dBu Field Strength ( dBm hypothetically) Since the energy in the field is only converted to power when the field is applied (as a voltage) across an impedance, this power value is for this illustration only, assuming a 50 Ohm impedance value. Compute field strength at the location Radome Loss -.5dB

TX TPO: 100Watts (+50dBm) RX Threshold: 0.7uV (-110dBm) Line Loss -1dBLine Loss -.5dB Antenna Gain +9dBAntenna Gain 0dB Free Space Loss -109dB Path Loss -50dB RSL -102dBm Handheld Now consider a particular receiver at that location 17.3 dBu “ dBm” Radome Loss -.5dB

TX TPO: 100Watts (+50dBm) RX Threshold: 0.7uV (-110dBm) Line Loss -1dBLine Loss -.5dB Antenna Gain +9dBAntenna Gain 0dB Free Space Loss -109dB Path Loss -50dB RSL -122dBm Body Loss -20dB Handheld Add localized losses 17.3 dBu “ dBm” Radome Loss -.5dB

TX TPO: 100Watts (+50dBm) RX Threshold: 0.7uV (-110dBm) Line Loss -1dBLine Loss -.5dB Radome Loss -.5dB Antenna Gain +9dBAntenna Gain 0dB Free Space Loss -109dB Path Loss -50dB RSL -122dBm RX Threshold: 0.5uV (-113dBm) Line Loss -.5dB Antenna Gain +6dB RSL -96dBm Body Loss -20dB HandheldVehicle Consider other receiver configurations at the same location 17.3 dBu “ dBm”