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Figure 5-18 shows the results of a measurement using an R&S HE200 antenna.

Antenna Calculations

The following is a list of various antenna calculations should you find it necessary to con-

vert from one to another:

Conversion of signal levels from mW to mV in a 50-ohm system:

where: P = power in Watts

V = voltage level in Volts

R = resistance in Ohms

For power in milliwatts (10

-3

W), and voltage in microvolts 10

-6

()( )

dB V

dBmm

=+107

Power density to field strength. An alternate measure of field strength to electric field is

power density:

120p

where: E = field strength in V/m

P = Power density in W/m

Power density at a point:

5-28

Chapter 5 Spectrum Analyzer Measurements

Figure 5-18. Field Strength Measurements

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tel. +39 0755149360

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