HELP5SCALING        The program has already determined the appropriate scaling  for the data in the file.  You may accept these values as   shown, or you may specify other values.  For example, you   may wish to "zoom" in on a particular part of the path.  By specifying the horizontal and vertical ranges appropriate tothe area of interest, that area will be scaled to fill the  entire plotting area, effectively enlarging that part of thepath.                                                                                                                   
HELP6PATHLENGTH     The effect of the earth curvature factor is a function of   the length of the path.  You may specify a path length      longer than the horizontal range entered above.  For        example, if the actual path is 20 kilometers long, but you  are only plotting the segment from 14 to 17 kilometers to   examine an obstruction in that region, you should specify a path length of 20 kilometers.  This is necessary to ensure  that the line of sight path and Fresnel zone plots will     correspond to the actual path length.                                                                                   Note that you may NOT specify a path length SHORTER than thehorizontal range.                                                                                                       
HELP7LINEOFSIGHT    A line drawn from the center of radiation to a target point will show areas where terrain obstructions may block line ofsight from the antenna to a target receive point.  In       addition, after the line of sight path is drawn, the Fresnelzone may be drawn for any desired frequency.                                                                            Usually the line is drawn from the specified center of      radiation to a selected target point.  The center of        radiation is the sum of the specified site elevation (MSL)  and the antenna height (AGL).  However, you may specify a   different center of radiation elevation, and the line will  be drawn from that point to the target.  The temporary      center of radiation elevation will NOT be saved.                                                                        The target point is specified by the distance on the radial from the primary site.  When this distance is entered, the  program  will estimate the elevation by interpolating valuesfrom the  elevation data file.  If the target distance is   beyond the  available data for the radial, the elevation of the last point in the file will be used.                                                                                After the target elevation (MSL) is determined, you can add an additional height above ground (AGL) for a receiving     antenna.                                                                                                                If you do not know the exact distance and/or elevation,     enter  approximate values.  The pen will move to that       location and you may then move the plotter pen (using the   cursor control keys, NOT the buttons, if any, on the plotteritself) to the exact location on the  profile. The system   will read the resulting elevation and  distance.                                                                        
HELP8FRESNEL        For Bullington loss calculations, the first (1) Fresnel zoneis used.  If an obstruction penetrates half of the first    Fresnel zone, signal attenuation will result.                                                                           For reflection calculations, even numbered (2,4,...) Fresnelzones are used.  If a flat reflective surface is located at an even numbered Fresnel zone, cancellation losses will     result.                                                                                                                 
HELP9FRESNELLABEL   The Fresnel zone number, ratio and frequency can be added toidentify the Fresnel zone plot(s).                                                                                      Because of the limited size and resolution of the screen,   you can choose not to label the Fresnel zone.  The label mayobscure other important features of the plot on the screen. When you plot to any other device, the Fresnel zone is      labeled automatically.                                                                                                  
HELP10FRESNELRATIO  If an obstruction penetrates half (0.5) of the first Fresnelzone, signal attenuation will result.  You may plot any     desired ratio (0.1 to 9.9) of the selected Fresnel zone.                                                                
HELP11FREQUENCY     The frequency is used to compute the Fresnel zone.                                                                      
HELP12PLOTOUTPUT    The plot output file created by this program contains HPGL  plotting commands compatible with the HP7475A plotter.  To  plot the file on other devices using SURFER(tm), the file   must be converted using the TAP "Create Surfer .PLT file"   program.                                                                                                                
HELP13CONTINUE      You may continue plotting this radial with the current      parameters, scale, etc.  If you do not continue plotting youcan either start over with this same radial and enter new   parameters, or you can start the next radial (if any).                                                                  
HELP14PLOTAGAIN     You may plot the same radial again, changing the scaling,   drawing different line of sight paths and Fresnel zones,    etc.                                                                                                                    
