R&S FSH Spectrum Analyzer Mode
Performing Spectrum Measurements
Operating Manual 1173.6275.12 - 30 92
3.1.11 Using Isotropic Antennas
The R&S FSH supports measurements with an isotropic antenna.
You can use any isotropic antenna available with the R&S TS-EMF system (order no.
1158.9295.05). Each of those antennas supports a different frequency range between
9 kHz and 6 GHz.
Test setup
The test setup consists of an R&S FSH and one of the isotropic antennas. The
necessary cables are provided with the antennas.
► Connect the RF cable with the N coaxial connector to the RF input (port 1).
► Connect the control cable to the power sensor interface (9-pin D-Sub connector)
with the adapter cable that comes with the antenna.
If necessary, you can connect an additional extension cable (R&S TS-EMFZ2,
order no. 1166.5708.02).
Starting the measurement
► Press the MEAS key.
► Press the "Meas Mode" softkey.
► Select the "Isotropic Antenna" menu item.
After you have turned the isotropic antenna on, the R&S FSH uses the isotropic
antenna for all measurements.
Note that when you turn the isotropic antenna on without having selected a
transducer factor first, the R&S FSH asks you to select a transducer factor.
Using transducer factors
The isotropic antenna is in effect a transducer. Because it has a characteristic
frequency response, it is necessary to correct the measurement results by these
characteristics.
The transducer factors for each of the supported isotropic antennas are provided with
the R&S FSH. The factors contain typical correction values for all three antenna
elements as well as the correction values for the cable.
► Press the AMPT key.
► Press the "Transducer" softkey
The R&S FSH opens a dialog box to select the transducer factor.
► Select the "Primary Transducer" menu item.
► Select the transducer factor.
The file you have to select depends on the antenna you are using. The file type of
transducer factors for isotropic antennas is *.isotrd.
► Confirm the selection with the "Select" softkey.
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