Frequency Scan How-To

Frequency scan uses one or more connected receivers to monitor the RF environment. The results are displayed in a spectrum analyzer view, and can be exported to the Frequency Coordination tool or saved to file for future reference. For best results conduct the scan with the same receiver antenna placements that will be used in production, and at the same time of day that the system will be used. A scan can be run over long period of time to monitor for interfering signals that come and go; they will be captured by the peak-hold trace of the spectrum analyzer.

Note - Frequency Scan is not available when Wireless Designer is Off-Line.

 

 

This feature is located in the Frequency Scan tab.

Follow these steps to run a frequency scan:

  1. Connect to the receiver(s).
  2. Start the scan.
  3. Set markers.
  4. Stop the scan.
  5. Export scan data to the Frequency Coordination tool.
  6. Export scan data to a file.
  7. Clear scan data.

1. Connect to the receiver(s)

Connect to one or more receiver frames using the Connect (Live) main menu item. Click the Session icon in the tree view, then the Frequency Scan tab.

The spectrum analyzer horizontal axis is frequency in MHz, with scales provided at top and bottom to identify TV channels and Lectrosonics frequency blocks. The vertical axis is RF level in dBµV.

Tip - Be sure your current locale setting is correct so that the TV channel scale is accurate for your location.

 

 

 

2. Start the scan

Click Start on the spectrum analyzer.

Wireless Designer will build up as complete a view as possible using available receiver channels, whether in one frame or multiple frames.  The receiver channels used are colored orange in the Session tree view when scanning. Those parts of the spectrum not covered by a receiver channel are indicated with a "hatched" background.

 

Scanning is continuous and signals are plotted in yellow  with a peak-hold trace so that transient signals are not "forgotten". A separate scan cursor appears for each block being scanned. These shown as vertical orange lines. In this example a receiver channel is available for all blocks. We can clearly see multiple DTV stations!

3. Set markers

Optional. At times it may be useful to place a marker on some frequency or signal of interest appearing in the scan. To do this, move the mouse to the desired frequency or signal, right click and choose Add Marker from the popup menu.

This places a marker on the selected signal, shown as a vertical blue line.

Markers can be moved to position them more accurately. Click and drag the marker to the new location.

To remove a marker, right click it and choose Remove Marker from the popup menu.

Tip - Use a pair of markers to delimit a specific frequency range of interest, such as a TV channel.

 

 

4. Stop the scan

Click Stop on the spectrum analyzer.

The scan is stopped. Now the data can be exported for use in the Frequency Coordination tool, or save to a file for future reference.

5. Export scan data to the Frequency Coordination tool

Optional. Click Export To Frequency Coordination to export the scan data to the Frequency Coordination view.

The data copied will overwrite any existing scan data.

Note - When working in the Frequency Coordination tool, importing scan data has the same effect.

 

 

6. Export scan data to a file

Optional. Click Export To File... to export the scan data into a file for future reference.

The Save As dialog opens.

Navigate to the desired location in the file system, enter a meaningful name and click Save.

7. Clear scan data

Optional. Click Clear to clear the scan data.

Do this to prepare for another scan if you want to discard previous history.