PROJECT PROPERTIES

An interfering signal offset from the desired signal will translate a mixer's LO sideband noise into the passband and thus desensitize a receiver. The Interference report type allows you to specify the offset of an interferer and to see the level required to cause a specific level of interference. For instance, in the report shown below, an interferer offset 25 kHz (at the system input) would need a signal strength of -65.7 dBm to cause MDS additional noise contribution. This would, in affect, reduce the sensitivity by 3 dB since the channel noise would have increased by 3 dB. The same interferer is 54.5 dB above the sensitivity level (-120.2 dBm for this example) as shown in the Margin column. The interference power level is determined by the Mixer's SSB noise level and the filtering encounter by the interferer.

Interference Report

LO Modulation Report

The equivalent SSB power due to the composite power spectral density of all contributing mixers is computed in the LO Modulation report type. From the SSB power, other parameters such as Residual Phase, Residual FM, Hum and Noise and Error Vector Magnitude are displayed.

The Properties dialog box consists of a navigation tree control on the left and a series of tabbed pages on the right.  By selecting a project icon in the tree control, a set of tabs are displayed which expose the project's user-configurable properties.

Display Tab

The project Display tab establishes the default appearance and user interface for all the system pages within the project. There are two list boxes shown on the Display tab: Display Parameters and Hidden Parameters. By moving items between the ‘Hidden parameters’ and the ‘Display parameters’, you can customize exactly what will be shown beneath each component on each system page. A parameter is moved by first selecting it within a list box and then clicking the << or >> button as appropriate.

There are two independent sets of customizable parameters: input and output. Either set can be displayed by selecting the appropriate button within the Parameter Set group box.

Input Parameter Set

The input parameter set consists of all component items that can be directly edited on a system page such as NF and Gain. Only those parameters in the Display Parameters list box will appear below the components on each page. These parameters will appear in the same order on the system page as they appear in the Display Parameters list box. The parameters can be reordered by selecting a parameter in the Display Parameters list box and clicking on the Up or Down buttons below the list box as appropriate.

Output Parameter Set

The output parameter set consists of all non-editable component items that can be displayed on a system page such as Pout. Only those parameters in the Display Parameters list box will appear below the components on each page. These parameters will appear in the same order on the system page as they appear in the Display Parameters list box. The parameters can be reordered by selecting a parameter in the Display Parameters list box and clicking on the Up or Down buttons below the list box as appropriate.