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TX TPO: 100Watts ( +50dBm ) PowerPoint PPT Presentation


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TX TPO: 100Watts ( +50dBm ). Start with a Transmitter. Line Loss - 1dB. TX TPO: 100Watts (+50dBm). Add some transmission line. Antenna Gain +9dB. Line Loss -1dB. TX TPO: 100Watts (+50dBm ). And an antenna. Radome Loss - .5dB. Antenna Gain +9dB. Line Loss -1dB.

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TX TPO: 100Watts ( +50dBm )

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Tx tpo 100watts 50dbm

TXTPO: 100Watts(+50dBm)

Start with a Transmitter


Tx tpo 100watts 50dbm

Line Loss -1dB

TXTPO: 100Watts(+50dBm)

Add some transmission line


Tx tpo 100watts 50dbm

Antenna Gain +9dB

Line Loss -1dB

TXTPO: 100Watts(+50dBm)

And an antenna


Tx tpo 100watts 50dbm

Radome Loss

-.5dB

Antenna Gain +9dB

Line Loss -1dB

TXTPO: 100Watts(+50dBm)

Plus a radome for ice protection


Tx tpo 100watts 50dbm

Radome Loss

-.5dB

Antenna Gain +9dB

ERP: 57.5dBm(562Watts)

Line Loss -1dB

TXTPO: 100Watts(+50dBm)

Now compute the Effective Radiated Power


Tx tpo 100watts 50dbm

Radome Loss

-.5dB

Antenna Gain +9dB

Free Space Loss -109dB

(44 miles on 155 MHz)

Path Loss -50dB

(Terrain obstructions,

vegetation, buildings

on path to this point)

Line Loss -1dB

TXTPO: 100Watts(+50dBm)

Compute losses to a receive location


Tx tpo 100watts 50dbm

17.3 dBu Field Strength

(-101.5 dBm hypothetically)

Radome Loss

-.5dB

Antenna Gain +9dB

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.

Free Space Loss -109dBPath Loss -50dB

Line Loss -1dB

TXTPO: 100Watts(+50dBm)

Compute field strength at the location


Tx tpo 100watts 50dbm

17.3 dBu

“-101.5 dBm”

Handheld

Radome Loss

-.5dB

Antenna Gain +9dB

Antenna Gain 0dB

Free Space Loss -109dBPath Loss -50dB

Line Loss -1dB

Line Loss -.5dB

TXTPO: 100Watts(+50dBm)

RXThreshold: 0.7uV(-110dBm)

RSL -102dBm

Now consider a particular receiver at that location


Tx tpo 100watts 50dbm

17.3 dBu

“-101.5 dBm”

Handheld

Radome Loss

-.5dB

Antenna Gain +9dB

Antenna Gain 0dB

Body Loss -20dB

Free Space Loss -109dBPath Loss -50dB

Line Loss -1dB

Line Loss -.5dB

TXTPO: 100Watts(+50dBm)

RXThreshold: 0.7uV(-110dBm)

RSL -122dBm

Add localized losses


Tx tpo 100watts 50dbm

17.3 dBu

“-101.5 dBm”

Handheld

Vehicle

Radome Loss

-.5dB

Antenna Gain +9dB

Antenna Gain 0dB

Antenna Gain +6dB

Body Loss -20dB

Free Space Loss -109dBPath Loss -50dB

Line Loss -1dB

Line Loss -.5dB

Line Loss -.5dB

TXTPO: 100Watts(+50dBm)

RXThreshold: 0.7uV(-110dBm)

RXThreshold: 0.5uV(-113dBm)

RSL -122dBm

RSL -96dBm

Consider other receiver configurations at the same location


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