![]() If the link is to be implemented the value should be included in the worksheet. You will be asked if you want to include the diffraction loss in the work sheet. If the value exceeds 25% of the fade margin the link should be rejected and an alternative route found. Click on the Tick on the report to accept the values. Press F9 to calculate the Diffraction Loss of the link. Edit this list to include the Kmin value for the link. Click on Configure – Edit K List, a list of default K values is displayed. To do this you may have to edit the K list. Set the value of K to Kmin using the K dropdown menu at the top of the screen. If the path is obstructed then the link should be rejected and an alternative route found. Set the value of K to 1.33 using the K dropdown menu at the top of the screen. Close the Fresnel Zone option box when you are finished. Select how you want the Fresnel zones to be displayed and press Draw. To draw the Fresnel zones press F2, the Fresnel Zone option box is displayed. The Diffraction Loss Module is displayed. If however, there is no alternative a link can be designed that is obstructed, provided that the diffraction loss does not exceed 25% of the fade margin at Kmin. This module should never have to be used as links should not be designed that are obstructed.
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