How do I set up a Radial Study in HDCoverage?

To create a Radial study, click the button showing the radials:

radialstudy

The step along the radials is important for radial studies computed with analytical propagation models such as Bullington, Longley-Rice, or Okumura. The Step Distance determines the resolution of the computed point locations along the radial.

Set the step value on the form:

stepform

You can define the azimuths on which you want to compute the field strength values. For example, suppose you want to compute 72 equally spaced radials. Click the “Number” button:

numberbutton

You will be prompted to enter the number of radials to create:

radialcreate

You will be prompted for the range of the radials from the fixed facility:

radialfixed

When the number, length and step for the radials have been entered, the program creates the radials for the calculation:radialcalculation

You can edit individual values on each radial:

eachradial

Note the pencil icon at the left end of the row indicating that the value is being edited.  You can undo the edit as long as the pencil is displayed by clicking the Esc key on your keyboard and the original value will be displayed.

You can delete a row by selecting it by clicking on the selection button to the left of the row and clicking the Delete key on your keyboard.

You can add individual radials by scrolling to the end of the list to the row with the asterisk (“*”) in the selection button.selection

When you start typing on that line, a new azimuth record is created:

azimuthrecord

You can fill in the desired values in each column:

column

Click another line to move off of the new line so the pencil icon disappears. This is necessary to be sure the new added azimuth is saved.

Click the Sort button if you want to see the radials displayed in order by the azimuths. (The program automatically sorts the radials when the coverage study “Task” is saved, as described below.)

coveragetask

You can also define a range or aperture of azimuths. For example, suppose you are particularly interested in the area to the southeast of the Fixed Facility and you want to compute the contour every 1 degree (instead of every 5 degrees) over that range. Click the Range button:

rangebutton

You will be prompted for the range and increment of the azimuth values:

incrementazimuth

You will be prompted for the length of the radials to compute for the contour:

computecontour

When these values have been entered, the new azimuths will be added at the end of the list:

endoflist

You sort the azimuths to put them in the correct order. In this example, there will be some duplication of azimuths. The original 72 azimuths created rows for azimuths 140, 145, etc., which were 30 kilometers long with a step value of 0.1 kilometer. The range of radials from 140 to 160 also created entries on some of the same azimuths (140, 145, etc.) but with different length and step settings (40 kilometers, 0.05 kilometers).

The program resolves this ambiguity of duplicate azimuth values by always using the longer distance and the smaller step value. This change is applied when you Sort the list:

sortlist