Transcript No Slide Title

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
TX
TPO: 100Watts
(+50dBm)
Plus a radome for ice protection
Radome Loss
-.5dB
Antenna Gain +9dB
ERP: 57.5dBm
(562Watts)
Line Loss -1dB
TX
TPO: 100Watts
(+50dBm)
Now compute the Effective Radiated Power
Radome Loss
-.5dB
Antenna Gain +9dB
Free Space Loss -109dB
(44 miles on 155 MHz)
Line Loss -1dB
Path Loss -50dB
(Terrain obstructions,
vegetation, buildings
on path to this point)
TX
TPO: 100Watts
(+50dBm)
Compute losses to a receive location
Radome Loss
-.5dB
17.3 dBu Field Strength
(-101.5 dBm hypothetically)
Antenna Gain +9dB
Free Space Loss -109dB
Path Loss -50dB
Line Loss -1dB
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.
TX
TPO: 100Watts
(+50dBm)
Compute field strength at the location
Radome Loss
-.5dB
17.3 dBu
Handheld
“-101.5 dBm”
Antenna Gain +9dB
Antenna Gain 0dB
Free Space Loss -109dB
Path Loss -50dB
Line Loss -1dB
Line Loss -.5dB
TX
RX
TPO: 100Watts
(+50dBm)
Threshold: 0.7uV
(-110dBm)
RSL -102dBm
Now consider a particular receiver at that location
Radome Loss
-.5dB
17.3 dBu
Handheld
“-101.5 dBm”
Antenna Gain +9dB
Antenna Gain 0dB
Free Space Loss -109dB
Path Loss -50dB
Line Loss -1dB
Body Loss -20dB
Line Loss -.5dB
TX
RX
TPO: 100Watts
(+50dBm)
Threshold: 0.7uV
(-110dBm)
RSL -122dBm
Add localized losses
Radome Loss
-.5dB
17.3 dBu
Vehicle
“-101.5 dBm”
Antenna Gain +9dB
Antenna Gain 0dB
Free Space Loss -109dB
Path Loss -50dB
Line Loss -1dB
Handheld
Antenna Gain +6dB
Body Loss -20dB
Line Loss -.5dB
Line Loss -.5dB
TX
RX
RX
TPO: 100Watts
(+50dBm)
Threshold: 0.7uV
(-110dBm)
Threshold: 0.5uV
(-113dBm)
RSL -122dBm
RSL -96dBm
Consider other receiver configurations at the same location