IQ Signal Master™ MX280005A Vector Signal Analysis Software Help : Example Files : FM Radio
FM Radio
Examples of the IQ Signal Master are provided in a MX280005A Help file. Open the example files menus from the HELP menu as shown on Figure: Example Files - FM Radio. Download FM Radio to the same folder as the Modulation Analysis file location: (Documents >Anritsu > IQ Files > Example Files). This 886 Mb file may take several minutes to load.
Example Files - FM Radio
After the download is complete, additional files have been added to the IQ files folder as shown in Figure: FM Radio - Added Files.
FM Radio - Added Files
From the IQ files > Example Files folder, load the file shown in Figure: Load FM File.
Load FM File
1. Example Folder
2. Open File
Click the Playback Mode button. The FM Radio file is displayed in the Playback window as shown in Figure: Opened FM File - Playback Window.
Opened FM File - Playback Window
1. Playback Button
2. Opened File
Right-click the trace display to show the menu in Figure: Peak Finder.
Peak Finder
Click Peak Finder. Peak Finder finds the peaks in the display. Continuing to lower or raise the peak finder also changes the signals detected bandwidth.
Click and drag the mouse up and down the display to move the red reference level line.
Position the line on the display to optimize the peaks of interest as shown in Figure: Detected Peaks.
Detected Peaks
1. Peak Finder
2. Detected Peaks
Peak Table
The Peak Table lists the peaks that are displayed in the Trace Display as shown in Figure: Peak Table. Each peak is identified by:
Frequency: Center frequency of the signal.
Width: The bandwidth of the signal at the power level of the detected peak finder.
Power: The power level of the signal’s peak.
Peak Table
Add Peaks Manually
It may be difficult to find all the desirable peaks as lowering the peak finder closer to the noise floor may show more peak bandwidth than is desired. Add peaks of interest by performing a Shift-Click on signals as shown in Figure: Detected Peaks.
Add Peaks
1. Added Peaks
Remove and Align Markers
The FM peaks may not align at a particular snapshot on the display because of the characteristics of Frequency Modulation (FM). There may also be unwanted signals that are also present on the trace display.
Remove Marker
Remove a marker by first selecting it in the display (either click the marker in the graph, or click the marker entry in the Peak Marker table.) Then press the delete key. Note the marker is removed and the signal remains in the display. The marker is also removed from the Peak Marker table.
Align Marker
Manually align markers towards center of the signal by clicking a marker to select it, and then hold down the shift key and scroll the mouse wheel. This will adjust the frequency of the peak marker. At the same time, view the marker table. A selected marker highlights in purple in the trace display and the same marker is indicated in the Peak Table highlighted blue. Cursor movement is indicated in the frequency readout in the Peak Table. When the markers are close to a desired odd 100 kHz value (odd for FM station frequency), right click the marker table to display the menu shown in Figure: Align Markers.
Align Markers
1. Removed Markers
2. Align at 100 kHz Boundary
3. Highlighted Marker/Peak Table Marker
Click “Align at 100 kHz Boundary”. The results of the alignment shows each marked signal has been aligned to a 100 kHz frequency value as shown in Figure: Peak Table - Aligned Markers to FM Frequency.
If after the 100 kHz alignment is performed and there are still “even” 100 kHz frequency values, redo the manual alignment and then click the Align at 100 kHz Boundary again. Continue until each 100 kHz frequency value is aligned to an odd FM frequency to optimize the audio.
Peak Table - Aligned Markers to FM Frequency
Extract FM Audio
With the peak markers aligned, right-click the Peak Table and click “Extract FM Audio at Peak Positions” as shown in Figure: Extract FM. The FM extraction process may take a few minutes to complete. When the extraction is complete, the peak table changes to the AM/FM Audio table as shown. Double-click each of the signals listed in the AM/FM Audio table to listen to each captured FM audio.
Extract FM
Save Files
Right-click the AM/FM Audio table and click “Save All Channels to WAV Files” as shown in Figure: Save WAV Files. The dialog displays the number of files saved and the path to the location of the folder it is being stored to.
Save WAV Files
The stored wave files saved are shown in Figure: Stored WAV Files.
Stored WAV Files