Frequency Coordination View

This view can be broken down into five areas:

Channel List

This list summarizes the channels in the session and is used to control which are coordinated and which are not.

Columns:

Tip - If you can't see all of the columns, use the splitter bar between the Channel List and Report Window to increase the width of the Channel List.

 

 

 

Tool Bar

The control center for Frequency Coordination.

Controls:

Spectrum Analyzer

The spectrum analyzer view shows transmitter carriers, active TV channels, scan data and IMD products. The horizontal scale indicates frequency, and the vertical scale indicates RF level in dBµV. Additional horizontal scales are provided at the top and bottom to identify TV channels and Lectrosonics frequency blocks. The horizontal scale is adjustable with zooming and panning controls.

Note - IMD products are plotted with an arbitrary level on the signal strength scale. While Wireless Designer can compute the frequency of IMD products accurately, it cannot compute the level of IMD products accurately because variables such as distance between transmitters are unknown.

 

 

 

This view is updated in real time to show the state of the coordination as channel frequencies or TV channel assignments are changed.

Tip - Carrier lines for Custom Channels are colored a lighter shade of blue to distinguish them from the other channels in the session. We see two of them in the example above.

 

 

 

The Spectrum Analyzer is resizeable.

Click and drag the splitter bar separating it from the progress meter to make it taller or shorter.

In this example the Spectrum Analyzer has been made shorter to allow more space for the device list and report window.

Controls:

Zoom, Span and Pan

The spectrum analyzer has a scroll bar like control that is used to set the frequency span as well as to pan the display .  

The span normally covers frequency blocks 470 through 26. To change this, use  the grab handles at the ends of the control.

Position the mouse over the handle, click and drag the handle to a new location.

Here the span has been reduced to cover four blocks. The scroll bar shrinks to indicate the fraction of the total span now visible, and its location within the default span.

To pan the display, click and drag the scroll bar to re-center the display.

Here the view has been panned to cover another group of four blocks at the upper end of frequency range.

The Zoom In and Zoom Out buttons are used to zoom in and out quickly.

Click the Zoom Home button to reset the view to the default span.

Click the Zoom System button to set the span to include only the frequency blocks needed to display the channels in the session.

TV Channels

A TV channel scale is located along the top edge of the spectrum analyzer. To define a TV channel as active for frequency coordination, right click on a channel in the scale and choose Enable TV Channel from the popup menu.

Active channels are indicated by a green background in the spectrum analyzer.

Shortcut - double click a channel in the TV scale to enable or disable it.

 

 

Different geographic regions, or locales, use different broadcast TV standards. The width of TV channels and the channel numbering schemes vary from locale to locale.  Wireless Designer lets you specify the locale so that the TV channel scale is accurate for you location. To do this, right click on the Session icon in the tree view, choose Current Locale select a locale from the submenu.

Note - In North America TV operation of wireless microphones is forbidden in TV channel 37 to protect Radio Astronomy operations in that frequency range. When locale NA is selected, TV channel 37 is marked as off-limits. You cannot place a carrier there and Ch 37 frequencies are avoided by the coordination process. Choose Allow TV Ch 37 in Locale NA from the submenu if you need to override this behavior when operating outside the US and Canada.

 

 

 

 

 

Carrier Frequency Tuning

The mouse can be used to change a channel's carrier frequency. Position the mouse over the carrier, click and drag it to a new location.

Of course the carrier cannot be dragged outside of the tuning range of the receiver channel. This method of adjusting carrier frequency is used when manually coordinating frequencies.

Tip - When the mouse hovers over a carrier the channel name and frequency are displayed in a pop-up window for easy reference.

 

 

 

Frequency Conflict Markers

When frequency conflicts are detected, the affected carriers are identified by a marker in the spectrum analyzer display.

When this happens detailed conflict information will appear in the Report Window. These markers disappear when the conflict is resolved by automatic or manual coordination.

Scan Data Threshold

Frequency scan data imported into the Frequency Coordinator is used to improve the frequency list calculations. However, only signals in the scan data exceeding a certain threshold level are considered in these calculations. Here is a view of the spectrum analyzer with imported scan data (in yellow).

This threshold is shown as a horizontal red line and defaults to a value of 10, suitable for most applications. However, it may be adjusted to allow for factors such as transmitter power or to optimize the placement of carriers by the coordination process. Using the mouse, click and drag the threshold line to the desired level.

The minimum threshold is 0, the maximum is 20 on the RF level scale.

Frequency Coordination Options

Right click in the spectrum analyzer view and choose Coordination Options from the pop-up menu. This opens a sub-menu of options.

These include:

The defaults are sufficient for most frequency coordinations.

View Options

Right click in the spectrum analyzer view and choose View Options from the pop-up menu. This opens a sub-menu of options.

Check or uncheck these to control which IMD products are shown in the spectrum analyzer view. The default is checked for all options.

Report Window

Conflicts calculated during frequency coordination are listed in the this window. It is updated in real time so the result of changes are immediately available.

The conflict report identifies the channel affected, the nature of the interference, and the offending carriers or TV channels.

Progress Meter

Indicates that Wireless Designer is busy performing an automatic frequency coordination.

The time required by the process is dependent on number of channels being coordinated, but normally takes no more than few seconds.

Tip - The coordination time is limited by the Coordination Timeout setting. Click Stop Frequency Coordination to halt a coordination in progress.