Pathloss - Revision History

Pathloss 3.0 Revision History

Changes in the January 03, 2000 Release

All computer generated dates have been removed from the program. In the print profile module, the date can be
manually entered in the title block dialog box.

Changes in the June 8, 1998 Release

Changes have been made to allow installation without using safe mode on Windows 95

Changes in the March 9, 1998 Release

Changes have been made to allow hard disk operation on Windows NT - NTFS formated drives

Changes in the December 30, 1997 Release

Changes in the November 26, 1997 Release

Converting Grid ASCII files to the binary format could cause a program crash if elevations were encountered with more than 11 characters. This occured for elevations near zero which are expressed as 0.0002344553 for example.

Changes in the November 5, 1997 Release

Microwave Worksheet - ITU rain calculations

The effective path distance was calculated with the actual 0.01% rain rate. This version uses a maximum rain rate of 100 mm/hr for the effective path length

Changes in the September 29, 1997 Release

Terrain Data

Support for the DGM (German) terrain data base has been added.

It was impossible to enter coordintes less than one degree on either side of 0 degrees without changing the geographic defaults. For example -0 23 33 would be entered as 00 23 33 N if the default hemisphere was set to north.

Pathloss Version 3.0 Program Revision Status

Changes in the September 11, 1997 Release

Microwave Worksheet

The RTF File option in the worksheet report caused a program crash

VHF-UHF Worksheet

Radio lookup tables did not bring in the receiver sensitivity in dBW

Changes in the April 30, 1997 Release

Microwave Worksheet

Several row header formatting errors occurred as a result of the addition of severely errored seconds and unavailability in the microwave worksheet. This release corrects these. These format errors occur only in the April 22 release.

Planned Additions and Changes

Diffraction loss does not handle a range of trees

The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the April 22, 1997 Release

Worst month unavailability - severely errored seconds reliability format has been added to provide ITU compatibility.

Planned Additions and Changes

Diffraction loss does not handle a range of trees.

The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the April 09, 1997 Release

Diffraction Loss

The existence of certain diffraction loss calculations involving irregular terrain could cause a program crash when the diffraction module was reopened.

The TIREM algorithm can cause a program crash on path profiles less than 1 km when one site is extremely blocked. The sub algorithm can either be an effective knife edge or rough earth diffraction. The problem arises with the height gain term of the most severely blocked site. These paths are outside the intended range of the algorithm. This release fixes the problem by assigning a zero value to the height gain term whenever the argument of a logarithm is less than zero.

Microwave Worksheet - ITU 530 Rain

This release contains a preliminary release of a revised ITU 530 rain calculation. The 0.01% rain rate is shown in the dialog box and a safety factor. The effective 0.01% rain rate is calculated as the product of the 0.01% rain rate and the safety factor. The reports and the calculation display will be revised to show this effective rain rate in a forthcoming release.

Planned Additions and Changes

Diffraction loss does not handle a range of trees

The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the March 07, 1997 Release

Revisions to the French language screen. The minimum distance between points has been set to 0.001 miles or 001609 kilometers when using a digitizing tablet to generate terrain profiles..

Planned Additions and Changes

Diffraction loss does not handle a range of trees

The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the January 23, 1997 Release

Canadian DEM Files

The DTED-USGS Files data base selection will handle the new Canadian DEMS up to 68 degrees latitude. Below this latitude, the files correspond to one degree by one degree blocks with a elevation density of 3 seconds in latitude and longitude.

Changes in the January 16, 1997 Release

This release will operate on Windows NT Version 4.0

Terrain Data

Reference ellipsoid added for the South American datum of 1969 (Major axis 6378160 - Minor Axis 6356774.719)

Diffraction

The calculation of obstruction radius in the NSMA diffraction algorithm only has been changed. Three points are determined by the horizon points and the intersection of the horizon rays. The radius is determined from these points. This change has been agreed to by the NSMA Working Group 2 OHLOSS

Planned Additions and Changes

Diffraction loss does not handle a range of trees

The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the December 11, 1996 Release

Terrain Data

USGS 7.5 Minute Data Base (30 meter grid)

Some files ordered directly from the USGS do not conform to the standard file naming convention. When converting from ASCII to binary, the program will determine the correct file name and prompt the user to change the name if it does not agree with the ASCII file name.

7.5 Minute Terrain Data for Hawaii

The boundaries of some maps for Hawaii do not fall on 7.5 minute boundaries. The main island of Hawaii is OK. The islands of Maui, Molokai, Lani and Kahoolawe have boundaries which are offset by 5 minutes north and west.

The December 11, 1996 of Pathloss program takes into account this shift and will convert files from ASCII to binary and generate profiles in this area taking the shift into account.

At this time Map Grid does not report the correct map names for these islands.

The boundaries for island groups of Oahu and Kauai do not conform to the standard; however, this will be corrected in a future release of the program.

EDX Version 8 File Conversion

Support has been added for EDX version 8.0 file formats

Planned Additions and Changes

Diffraction loss does not handle a range of trees

The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the November 18, 1996 Release

Refection

The dispersion analysis screen could cause a program crash if the path was not line of sight.

Planned Additions and Changes

Diffraction loss does not handle a range of trees. The curved earth - curved axis profile display format will be revised to better fill the page.

Changes in the October 30, 1996 Release

Print Profile

The "flat earth K on beams" profile display shows the Fresnel zones as a series of 's, measured from ground or from the top of a structure as applicable. A memory leak was detected in this module which may account for reported problems with this module under heavy usage.

Planned Additions and Changes

Diffraction loss does not handle a range of trees The curved earth curved axis profile display format will be revised to better fill the page.

Changes in the October 23, 1996 Release

General

This release includes the preliminary release of the French Language screen displays.

Terrain Data USGS 7.5 ' Data Base

Certain USGS ASCII files produced a file read error when converted to binary.

Terrain Data CRC Data Base

The October 9 release did not correctly read CRC data base formats after August 1992.

Changes in the October 9, 1996 Release

Terrain Data CRC Data Base

An option has been provided to read versions of the Canadian CRC terrain data base formats prior to August 1992 and after August 1992.

Changes in the October 3, 1996 Release

Microwave Worksheet

The criteria for the effective radiated power warning on short paths was revised for the new FCC rules (101)

Changes in the September 26, 1996 Release

Area Coverage

When printing coverage radials which span multiple pages, all of the radials may not be printed if the display had been moved on the page

Changes in the September 11, 1996 Release

USGS 30 Second World Data Base

Changes were made to handle different formats in the header file. A profile which went outside of a map area could be corrupted.

Grid Ascii Data Base (Australia 9 second)

A profile which went outside of a map area could be corrupted.

Terrain Data Radial Profiles

If a UTM bearing reference was selected in the southern hemisphere, the bearings were inverted north to south.

Changes in the July 17, 1996 Release

Area Coverage

When processing CVG files, the program checks for duplicate radial bearings and that all parameters which affect the results are the same in all cvg files. This includes elevation, antenna heights, frequency, polarization, diffraction algorithm, K and the measurement units (metric/english) If a difference is detected, a "Parameter Conflict" error message is issued and process terminates. On some computers, this error caused a program crash.

Changes in the July 15, 1996 Release

Microwave Worksheet CCIR Initial Planning Method

The geoclimatic factor was saved as a zero value in files which used the CCIR initial planning method. This caused a program crash when the file was retrieved and the microwave worksheet selected.

Changes in the July 2, 1996 Release

The display zoom feature used in Map Grid and the Diffraction and Antenna Heights module produced an inverted zoom display under Windows 95

Terrain Data

Support for the USGS 30 second data base has been added. The image files are available over the Internet and provide world coverage. Support for ARC/INFO GRIDASCII files has been added. This was specifically developed for the AUSLIG 9 second data base.

Changes in the June 13, 1996 Release

Microwave Worksheet

When using lookup tables with diversity antennas, the antenna gain did not immediately update in the data entry form if the form was visible (ie not behind the lookup table). This change has no effect on the calculated results or reports.

Changes in the June 11, 1996 Release

Area Coverage

Line widths must be set to 0 when plotting area coverage on a pen plotter. The line widths for the title block, contours and reference arrows are automatically set to zero if a pen plotter is detected. The radial line widths must be set to zero in the line attributes dialog box. If a VHFUHF worksheet is used to enter data into the equipment parameters form, the fixed and mobile antenna gains were reversed if Site 2 transmit was selected. Note that Site 1 is always the fixed station and Site 2 is always the mobile station.

Map Grid

A scale has been added to permit map crossings to be shown in inches or centimeters when using one of the non defined map references (Other)

Changes in the May 20, 1996 Release

Changes were made to the Spanish translation. The worksheet data on some older Pathloss files (pl2) were not correctly converted.

Changes in the May 2, 1996 Release

EDX File Conversion

Some EDX files reported an Incompatible File Format Error

Changes in the April 24, 1996 Release

USGS 7.5 Minute Data Base

The April 13, 1996 release did not convert elevations to metric as stated stated. This has now been corrected.

Changes in the April 13, 1996 Release

USGS 7.5 Minute Data Base

Single or multiple directories can be used for the binary files. The subdirectory naming convention can be based on the file latitude or longitude. Multiple ASCII files can be selected and converted to the binary format in one pass.

Some USGS 7.5 minute ASCII DEM's have their elevations in feet. Previously it was assumed that all elevations were in meters. This release convert the data to meters in the binary file if the ASCII file is in feet.

RMC 3 Second Files Data Base

Single or multiple directories can be used for the binary files. The subdirectory naming convention can be based on the file latitude or longitude. This will allow files on CDROMS with an non standard directory structure to be read.

AUSLIG 3 second Data Base

The AUSLIG files are in 0.5 degree blocks. If the south west corner coordinates were not whole degrees in latitude or longitude (eg 115.5), the profile did not generate.

Changes in the March 24, 1996 Release

Terrain Data

An option has been added to the Phoenix data base to support the UNIX file format.

Map Grid

Site coordinates can be optionally displayed on the drawing.

Changes in the March 14, 1996 Release

Several changes were made to both the Pathloss and Map Grid program to resolve problems with the operation under Windows 95. The changes included increasing the program stack size and reworking the printer setup dialog.

Changes in the March 10, 1996 Release

Microwave Worksheet

An upper limit has been placed on the availability results. This limit affects the following calculations: Worst month one way (%) Annual one way (%) Annual two way (%) Rain Availability (%) Multipath + Rain (%)

In the availability option is selected, the limit is 99.999999 In the unavailability option is selected, the limit is 0.000001

Terrain Data

When converting USGS 1:250000 ASCII DEMs to the DTED format, the map index was updated with a longitude increment of 18 seconds. The correct value is 3 seconds for latitudes less than 50 degrees.

Known Problems

Pen plotters do not print the vertical axis in the correct orientation in the Print Profile module.

Changes in the March 4, 1996 Release

The microwave worksheet report caused and GP Fault on some computers on Windows 95. A "Maximum Number of Users Exceed" could be reported on a single user license installed on a network

Changes in the February 27, 1996 Release

Reports can be printed to a DOS text file.

Microwave Worksheet

A warning feature has been added if the EIRP exceeds the minimum values specified by the FCC. The minimum depends on the frequency band and path length. The calculation is shown in red if the minimum EIRP is exceeded. The "FCC ERP Warning" must be selected in the Microwave Worksheet Options to enable this feature.

Map Grid

The program produced a GPF if more than 302 sites were entered. The maximum number of sites has been increased to 490 and an error message now appears. Future releases of the Map Grid program will allow an unlimited number of sites.

USGS 7.5 Minute Data Base

The ASCII to Binary file conversion feature produced an "Incompatible File Format" error on some DEM files even though the files were of the correct format.

Changes in the February 17, 1996 Release

Microwave Worksheet

The effects of interference can be entered either as a threshold degradation of as interference fade margins. If the dispersive antenna spacing was blanked out, a math error could occur. This error existed since the upper limit to the diversity improvement factor feature was added to the program. If the dispersive antenna spacing is blanked out, the actual antenna spacings will be used to calculate the diversity improvement factor.

Terrain Data Module

The data base selection includes the Air Touch Cellular Phoenix 3 second terrain data base.

A feature to calculate vertical angles measured from site 1 has been added. This allows a comparison of the measured and vertical angles. The angles are measured from the zenith.

Map Grid

The following features have been added to the Map Grid Program: DXF file generation capability, Import a text file containing site names and coordinates, A map drawing mode which allows the user to specify the extents of the drawing and optionally disable the geographic grid.

General

The left and right side angles displayed with the Ins key, has been expanded to display the angles measured from both sites and from the cursor location.

Changes in the December 31, 1995 Release

Preliminary Spanish screen displays and reports have been implemented in this release. The language selection is made under the Setup menu on the main Pathloss window menu bar. The Coverage module and the dialog boxes under the Setup menu are still in English; however, all reports and graphics will be printed in Spanish. The language components are embedded in a resource file in the Pathloss program and cannot be edited with the use of a resource editor. If any changes to the language are required, please FAX a copy of the required changes to: Contract Telecommunication Engineering FAX 604 522 0624 and the changes will be incorporated.

Changes in the December 16, 1995 Release

Terrain Data Module

The digital map index in USGS_DTED Files has been expanded to include the latitude and longitude increment. This was required to accommodate non standard increments.

Changes in the December 14, 1995 Release

Map Grid

A DXF file save feature has been added. The method of selecting a line by double clicking on it used a Windows polygon region. This had a side effect of dramatically reducing the resources available to Windows. If the display was zoomed, the reduction in resources could become critical. In addition, the region creation on a zoomed display could fail and it would not be possible to select a line. The line selection has been completely revised.

The menu which appears when a line is selected has been expanded to include a line delete option. Previously it was necessary to select the Line Attributes dialog box.

Path Profile

If all Fresnel zone references were deleted, the last fresnel zones drawn would remain.

Microwave Worksheet

Using the Canadian version of CCIR 530, a negative or zero value could not be entered for the logarithmic geoclimatic factor.

Terrain Data

The disable profile drawing button had stopped working

Diffraction Variable Parameters

When the variable parameters display was printed, the text below the graph showed the global values of frequency and K.

Changes in the November 27, 1995 Release

Reflections

Two new methods of defining a reflective plane have been added. The previous version developed the plane using a least squares fit to the terrain points. In addition to this a plane can now be defined at a fixed elevation or directly between two points.

Worksheets

A pathloss file containing an off path structure could not be used as a worksheet template. A file read error was reported. Loading a microwave worksheet template would also load the transmit frequency assignment, and the expanded header lines. A microwave worksheet template now includes the maximum receive signal. If a microwave worksheet included expanded header lines, printing the worksheet through the clipboard could result is clipping at the lower edge.

Terrain Data

An option to convert version 7 of the EDX Rpath file has been added.

If a profile is reversed immediately after using the strip redundant points or expand flat terrain feature, the marked points would be reset to normal. Latitude and longitude crossings in the Inverse Coordinates data entry form have been revised to use the same algorithm as the Map Grid program. The old version used a great circle arc. The revised method uses an iterative technique to determine the crossings using the currently selected datum.

Map Grid

Accumulated distance has been added to the map crossing report.

Changes in the October 31, 1995 Release

Terrain Data

A binary file information function has been added to the USGS 7.5 minute data base. The major use of this function is to display the datum for the file (NAD27, NAD83, WGS72 etc).

Microwave Worksheet

An upper limit can be set for the diversity improvement on both space and frequency diversity systems. The maximum value is set in the Diversity Dialog box in the Microwave Worksheet module. The default value is 200. If the entry is blank, the theoretical values are used. Equation (25) for the space diversity improvement factor in IF combining systems has been changed to the same equation used for baseband switching systems. The only difference between the two methods is the effect of the thermal fade margin improvement. The reference for the original formula is considered to be specific to one radio type and the Vigants formula represents the general case.

When a version 2.2 data file contained rain calculations was loaded into the version 3.0, the main antenna data could become corrupted.

Changes in the October 17, 1995 Release

Worksheets

Worksheets did not correctly update if the diffraction loss was changed from some value to zero.

Terrain Data

Capability to read the USGS 7.5 minute data base using either the Micropath or SoftWright file naming convention has been added. Provision is also included to convert the USGS 7.5 minute ASCII files to a binary format. The SoftWright binary format is used in all cases.

Changes in the October 3, 1995 Release

General

It is now possible to associate a pathloss data file with the program in File Manager. A new instance of the Pathloss program will be created each time a file is selected.

Worksheets

Data entries from lookup tables did not set the data changed flag.

Map Grid

Files created with releases of the Map Grid program prior to Sept 04 could not be read with the current version. This has been corrected.

Changes in the September 17, 1995 Release

Map_Grid Utility

The map crossings now give the name of the topographic map for US 1:24,000 scale (7.5 minute) maps and Canadian 1:50,000 and 1:250,000 scale maps. The naming convention is set in the Grid Size dialog box. Crossing distances from the corners are given in inches and centimeters in addition to kilometers.

Pathloss File Format Change

The following new fields have been added to the microwave worksheet: Maximum Receive Signal Emission Designator Bandwidth TX Frequency Assignment In addition it is now possible to add two additional lines to the microwave worksheet header which previously consisted of only the site name.

The effect of these changes is that earlier of the program cannot read files which contain any of these new fields. The current program will read any of the Pathloss file formats. This is important if you exchange files with other users with an earlier version. In this case, you can make a copy of your Program Disk 1 and sent it to the other user to make a maintenance update. Alternately Program Disk 1 is available on the CTE BBS in the self extracting file PLW_MU.EXE.

Lookup Table File Format Changes

The microwave lookup table has been expanded to include the following additional fields: emission designator maximum receive signal operating frequency When a radio is selected into the worksheet, the frequency in the worksheet and the global value is set to the frequency in the worksheet. The file format has also been changed to delimit the fields with commas instead of the fixed field positions previously used. The program will accept either file format.

Terrain Data Module Digitizer

Unfortunately, our documentation did not state that Windows will lock out a serial port if an error occurs when using certain communications functions. This can occur when creating profiles using a digitizing tablet. When this occurred, it was necessary to close the Pathloss program and in some cases shut down windows to reenable the serial port. This has now been corrected.

Changes in the September 04, 1995 Release

General

The dynamic link libraries PLW_LIB.DLL and PLW_DBSE.DLL have been modified to allow the map_grid program to access routines in these libraries. The net effect of these changes is that the file PLW_LIB.DLL is now required to run the MAP_GRID.EXE program.

Terrain Data Module Digitizer

If a digitized profile had less than 10 data points, a GP fault could occur if any of the cursor keys were pressed when the digitizing was terminated.

Terrain Data Module RMC Files Data Base

The requirement to generate a map index for RMC 3 second files has been removed from the program. The Rocky Mountain file naming convention is now used to determine the required map file. Provision has been made to specify the file name suffix to accommodate both CDROM files and files supplied on floppy disks.

Microwave Worksheet

Average annual temperature can be a negative value. Note that this will not affect the annual outage times as a negative temperature is outside the allowable range in both degrees C and F.

Map Grid Utility

The following new features have been added to MAP_GRID.EXE:

Provision to enter coordinates in UTM format in the Site Data entry form. You can create a pathloss file directly from the map grid program. The file does not contain a profile.

Map crossings based on the grid lines can be determined. The latter two functions are invoked by double clicking on the line joining two sites. The specific selection including the line attributes are made from a popup menu. The drawing extents are automatically determined based on the latitude and longitude increments and the site coordinates. There is no longer any provision to enter the specific map corners.

The grid axis font size and attributes under the default menu had no effect.

Changes in the August 20, 1995 Release

Area Coverage Module

Contour drawing capability has been added to this module.

Map Grid Program August 18, 1995

Adding a new site to an existing drawing could cause a GPF if any of the sites were joined with lines. Map Grid support is also available on the BBS in the file MGRID_MU.EXE

Changes in the August 11, 1995 Release

General

Changes have been made to allow the program to be used on Microsoft Windows for Workgroups network. Procedures for installing Pathloss on a WFWG network are included at the end of the manual and are available on the BBS in the file NET_DIAG.ZIP.

Terrain Data Module

Changing, antenna heights, frequency or polarization in the Initial Parameters data entry form did not erase any diffraction calculations. If a profile with two ranges separated by one profile point was reversed, the display corrupted.

Map Grid

The Save and New menu items are disabled if there is no data. The New File selection updates the caption. When entering site data, the down arrow key now shows the new line number.

Changes in the July 23, 1995 Release

Windows 95 Pre Release 2 June, 1995

Changes were required to operate the Pathloss program under Windows 95. These changes included a new setup program and a modified installation program. Without these changes, it was necessary to disable the 32 bit file access to operate the installation program.

General

Error handling added to check for a default printer. In particular, the map_grid program cannot be used unless a default printer has been selected.

Terrain Data Radial Profiles

Additional error handling has been added to the radial profile generation using DTED map files. When using a DTED CDROM, it was necessary to confirm the CDROM file name for each radial profile. The site 2 coordinates on radial profiles are now always set to the last valid point read for all situations including a file read error, user termination and no digital maps.

The file verification routine for DTED files on CDROM using the Canadian file naming convention did not verify the entire file.

Additions in the July 13, 1995 Release

Map Grid utility has been added as a separate utility. This program creates a system diagram of radio sites on a geographic grid.

Changes in the July 9, 1995 Release

General

A check for a non zero start distance has been added to the file load procedure. This situation could only occur if the data file was externally generated. Duplicated distances are also checked; however, there is no check for non sequential distances. A math error handler has been added. Underflow is set to zero and no error messages are issued. Any other math error other than divide by zero will be trapped and an error message reported.

Terrain Data Module

An option has been added for the DTED CDROM data base selection to provide for the non standard DTED directory structure used by the Canadian Energy Mines and Resources. A GP Fault could occur using any of the terrain data base options if the path name of the data base file exceeded 20 characters. The limit is now set to 80 characters.

The Accept/Reject Changes menu function is enabled if duplicate points exist. All duplicate points can be stripped using this function.

Print Profile Module

Batch profile printing has been corrected to allow files located in different directories to be specified. The unique file name restriction remains.

Changes in the July 05, 1995 Release

Microwave Worksheet

Polarization is always printed in the report. Previously polarization was only printed if a rain calculation existed.

VHFUHF Worksheet

Saving a lookup file could cause a general protection fault. The lookup table was correctly saved. This error did not occur in the microwave worksheet.

Changes in the June 5, 1995 Release

Terrain Data

The data entry prompt was not reset when the delete all points function was used.

Worksheets

When more than one page was required for a worksheet report and the include notes options was selected, the worksheet lines did not format correctly.

Text Reports

Minor changes made to correlate screen font and printer font sizes

Changes in the May 26, 1995 Release

Reflections Module

A negative value of K using divergence produced a log10 domain error in the null depth report

Changes in the May 17, 1995 Release

The following changes and additions have been made to earlier BETA releases

Terrain Data Module

Stub code for a user supplied dynamic link library to read a terrain data base has been added. The source code for the stub is given in the directory USER_DLL. Coordinate formatting revised to show the exact number of decimal places specified in the geographic defaults section. Previously the format did not add zeros e.g. 49 34 15.00 would have been displayed as 49 34 15.0

South Africa National Exchange Standard terrain data base support has been added. Geographic defaults was revised to use either UTM or Gauss Conformal coordinates. The latter was used in the development of the NES data base and is only applicable to the conventions used in South Africa. Australian AUSLIG 3 second terrain data base support has been added.

Coverage Module

Printing before the processed data file was saved caused a general protection fault. The title block scale did not correctly format for short distances.

If the title block on a separate page was selected, the title block was always printed even if the no title block option had been selected.

Microwave and VHFUHF Worksheets

Additional checks have been added to blank out the calculation display if parameters involved in the calculation have not been correctly entered

Other Changes

A calculation and status summary has been added at the bottom of all graphic display prints. This can be switched off in the Page Layout dialog box located under the Print menu selection on each applicable screen

Changes in the April 21, 1995 Beta Release

Terrain Data Module

Adding or Deleting a single or offpath structure did not register a change to the user data.

Coverage Module

Equipment parameters can be set to the values in the VHF UHF worksheet using either site 1 or site 2 as the transmit site. Clipboard and Windows metafile coverage printing has been added.

Antenna Heights Module

The Path Clearance report now measures the horizontal clearance to off path structures expressed as clearance to first Fresnel zone ratio in percent.

A GP fault occurred when the calculate clearance criteria was opened on an obstructed path.

Diffraction Module

On obstructed paths, the foreground loss using the Pathloss LOS option did not calculate on the left side of the path. Note that the default foreground loss method is scaled height gain in Version 3.0.

Reflective planes were not printed TX and RX antenna gains used in tropospheric scatter loss can now be individually not included. This will allow one site to be a terrestrial station and the other to be an earth station.

Multipath Module

Constant gradient ray trace used different densities on milesfeet and kmsmeters measurement systems

Worksheets

Additional editing keys have been added to Lookup Tables: F4 copies the entry above the cursor F3 erases antenna radome loss in antenna lookup tables erases dispersive fade margin in the microwave radio lookup tables. This key has no effect on other entries.

The file name extension, "tpl" is automatically added to template file names without any suffix in Save Template for both the microwave and VHFUHF worksheet.

Other Changes

When the program closed, the windows utility Dr. Watson reported unknown errors in the dynamic link libraries PLW_LIB.DLL and PLW_DBSE.DLL. This has been corrected.

Initial Beta Release March 31, 1995

Last Update: 01/04/00