Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
168
User Manual 1321.1011.02 ─ 11
Decrease of measurement speed
The R&S Spectrum Rider performs a measurement on each of the three antenna axes,
the update rate of the results decreases slightly.
You can select to display different aspects of the measurement.
1. Select "Meas Mode" softkey.
2. Select the "Isotropic Antenna" menu item.
The R&S Spectrum Rider opens a new menu to select the measurement aspect.
● "Auto"
Shows the total field strength over all three antenna axes.
The displayed result is a combination of the results for each antenna element.
After measuring each of the three directions individually, the R&S Spectrum
Rider calculates the total field strength (E
r
) based on the results for each
antenna element.
E
r
=
√
(E
2
x
+ E
2
y
+ E
2
z
)
● "X"
Shows the field strength measured on the antenna's x-axis only.
● "Y"
Shows the field strength measured on the antenna's y-axis only.
● "Z"
Shows the field strength measured on the antenna's z-axis only.
6.1.11
Measuring the Effective Isotropic Radiated Power
The R&S Spectrum Rider supports EIRP measurement. Using the directional antenna
(e.g. R&S HE300 or R&S HE400), the R&S Spectrum Rider is capable to calculate the
EIRP measurement for antennas.
EIRP calculation
With the given parameters, it is possible to calculate the EIRP using the following sim-
plified equation:
EIRP
dB
= Measured channel power (excluding antenna gain and cable loss) - received
antenna gain + received cable loss +
(free space path loss)
FSPL calculation
FSPL
dB
= 10 log
10
( (4
π
df / c)
2
)
= 20 log
10
(d) + 20 log
10
(f) + 20 log
10
( 4
π
/c )
= 20 log
10
(d) + 20 log
10
(f) - 147.55
Performing Spectrum Measurements
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