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Itm user guide Irregular Terrain Model User ? s GuideProgram Requirements Program requires Windows NT or Windows Runs best with MB or more RAM and MB Hard disk space for program installation Mode Selection Figure shows the initial screen with buttons for

Irregular Terrain Model User ? s GuideProgram Requirements Program requires Windows NT or Windows Runs best with MB or more RAM and MB Hard disk space for program installation Mode Selection Figure shows the initial screen with buttons for selecting Area Prediction Mode or Point-To-Point Mode Screen Figure ?? Initial Area Mode This selection is used in cases where the exact terrain is not known Environmental parameters and statistical parameters are used in calculating path loss Terrain roughness is approximated from a user-entered value of delta h change in terrain height All calculations are held in a report log which can be viewed printed and stored to a ?le Point ?? To ?? Point Mode This selection retrieves a terrain pro ?le based on the user entered latitude and longitude values for the transmitter and receiver Statistical and environmental parameters are used with the terrain pro ?le in calculating path loss All calculations are held in a report log which can be viewed printed and stored to a ?le Area Prediction Mode Calculations Values describing environmental statistical and distance conditions are entered Calculated values are sent to the Report Log Figure shows the entry screen with input parameters and report access CFigure ?? Area Prediction Mode Input Parameters Antenna parameters are entered in this section The user provides values for transmitter and receiver antenna heights in meters transmitting polarization horizontal or vertical and frequency in MHz Site criteria for transmitting and receiving antennas are given as random careful or very careful The site criterion describes the degree of care taken in selecting the antenna position Environmental Parameters Conditions are entered in this section for terrain roughness delta h in meters surface refractivity in N-units dielectric constant of ground and conductivity of ground in S m Pressing the button to the left of the entry box provides a list of suggested values Radio climate is selected from the following list Equatorial Congo Continental Subtropical Sudan Maritime Subtropical West Coast of Africa Desert Sahara Continental Temperate Maritime Temperate over land United Kingdom and Continental West Coasts and Maritime Temperate over sea Statistical Parameters The user enters values for Percent of time Percent of locations and con ?dence levels in this section Up to four values for Con ?dence Level can be used Mode of variability is selected from the following list Single Accidental Mobil and Broadcast Tabulation Parameters Results are calculated based in distances The start distance is entered in km The user then has the ability to provide a step rate to a distance then a second step rate to a ?nal distance All distance values are entered in kilometers C Results Once parameters have been entered the values can be calculated by pressing the Calculate button at the bottom of the dialog box or by selecting Run Calculations from the Report menu choice A graphical representation of the calculations is displayed when the user clicks the View Graph button The graph displays dB loss vs distance for each con ?dence