4-5 Interference Polar IA Spectrum Analyzer (Option 24)
4-8 PN: 10580-00447 Rev. H Spectrum Analyzer MG
4-5 Interference Polar
This section describes the Interference Polar capability and key characteristics of Interference Polar
measurement mode. This is an alternative technique to geo-locate a potentially interfering signal without
having to go to multiple locations. The user stands at a fixed location and makes a full rotation along with the
MA2700A handheld InterferenceHunter and a directional antenna through 360º. A polar plot of the signal
strength in all directions is displayed on the map.
The polar plot of the interfering signal is located by following the steps below:
1. Select System menu, go to SETTINGS > GPS, and toggle GPS/GNSS on.
2. Select System menu, go to TOOLS > MAP TOOL to download a digital map of the current location. Note
that Internet connection is required to download the map tiles of the selected location. Ensure to have
either an Ethernet or a Wi-Fi connection.
3. Connect the GPS, MA2700A handheld InterferenceHunter and suitable directional antenna (for e.g.
Yagi antenna) to instrument.
4. Select MEASURE > MEASUREMENT > Interference Polar.
5. Set up the frequency and span in order to view the signal of interest on the spectrum display. Ensure not
to make the span too wider, as this slows down the instrument’s response in locating the interfering
signal.
6. Select SETUP > INTEGRATION BW and set an appropriate integration bandwidth to measure the
channel power of the signal of interest.
7. Select SETUP > VOLUME to increase the instrument’s volume in order to listen for max channel power.
8. Select SETUP menu and press START MEAS and slowly make a full rotation in clock-wise direction
holding the directional antenna to complete 360º. Refer to Section “SETUP Menu (Interference Polar)”
on page 4-10.
9. Notice that the rotation of the antenna places series of red lines to create a polar plot of the signal in
every direction. The direction of maximum signal strength indicates the transmitter that is the source of
the interfering signal.
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