ereps30.txt

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		     EREPS VERSION 3.0 UPDATE NOTES

1.0  Software support
     
  COMMANDING OFFICER     
  ATTN: D883             
  SPAWARSYSCEN SAN DIEGO 
  49170 PROPAGATION PATH 
  SAN DIEGO CA 92152-7385


  Commercial:  619-553-1424
  DSN:         553-1424
  FAX:         [phone]
  e-mail:      [e-mail]

     All of the EREPS 3.0 programs are written in Microsoft Basic 7.1 PDS 
and will be maintained solely by us.  Copies of the EREPS programs may be 
made and freely distributed within a working group.  Discrepancies in EREPS 
3.0 products, difficulties encountered while running the programs, requests 
for special applications, and questions concerning the use of EREPS should 
be directed to us at the above address or phone.
	
     To help us provide technical support for EREPS 3.0, an ASCII file, 
REGISTER.TXT, is provided on the distribution disk.  This file contains a 
registration form which may be filled out and mailed to us at the above 
address.  Registration of your EREPS 3.0 disk will insure your receipt of 
any future upgrades of the EREPS software, newsletters, or technical 
supporting documentation.  Please limit registration to one per physical 
location or working group. 

2.0  Hardware and software requirements

     You may run EREPS 3.0 on an IBM PC, Personal Computer AT, PC/XT, or 
100% compatible computer with an EGA or better graphics capability.  EREPS 
3.0 requires MS-DOS version 3.0 or greater.  Each EREPS program requires a 
different minimum amount of random access memory (RAM) to operate at its full 
potential.  The RAYS program is the most demanding at 510 kilobytes.  While 
a hard disk is not required for an EREPS program's operation, it is 
recommended.   A hard disk IS required to initially expand the individual 
programs however.  Additionally, a mouse is not required but is highly 
recommended.

     EREPS 3.0 does not contain an internal capability to capture and print 
screen graphics.   Therefore, a printer is not required for EREPS 3.0 
operation.  If you have a printer and would like paper or overhead slide 
copies of the EREPS screens, you must provide your own screen capture and 
print software.  An example of such a utility is the GRAPHICS.EXE program 
that is provided with MS-DOS 5.0 and above.  Warning!  Some screen capture 
and print utilities, such as Pizazz Plus by Application Techniques, Inc., 
will cause the EREPS programs to behave erratically.  The on-line help 
within EREPS provides guidelines for overcoming these behaviors.


3.0  EREPS 3.0 distribution diskette

     EREPS 3.0 is distributed on one high-density 3.5 inch floppy diskette.  
The individual EREPS programs are compressed into a single, self-expanding 
file called EREPS30.EXE.  To expand the EREPS programs, copy the EREPS30.EXE 
file to any directory on a hard disk, place yourself in that directory, and 
type EREPS30.  Once expanded, the individual EREPS (*.exe) programs may be 
copied to and run from a floppy diskette.  Do NOT try to expand the 
EREPS30.EXE file while your current drive is the floppy drive.  Once the 
programs are expanded, the EREPS30.EXE file may be deleted to conserve disk 
space.  You may use any directory structure you wish to organize your 
EREPS programs.  Once expanded, EREPS 3.0 consists of the following files:

     PROPR.EXE    -   Propagation loss versus range program.

     PROPH.EXE    -   Propagation loss versus height program.

     COVER.EXE    -   Height versus range electromagnetic coverage program.

     RAYS.EXE     -   Range-dependent raytrace program.

     SDS.EXE      -   Evaporation and surface ducting climatology program.

     FFACTR.BAS   -   An ASCII Microsoft BASIC 3.0 source code listing to be 
		      compiled external to the EREPS system.

     REGISTER.TXT -   An ASCII file containing an EREPS registration form.

     EREPS.HLP    -   An ASCII help file used by all EREPS programs. You
		      may print this file on a printer but it is not
		      necessary (nor particularly recommended).  Each item 
		      of help in the file is "keyed" to a short prompt as 
		      seen on an EREPS page.  The @ symbol is used to 
		      separate short prompts.  For example, @TRAN HT@
		      identifies help for transmitter height.  If you do 
		      choose to print this file, we suggest you first copy 
		      it, giving it a different name.  Then using an ASCII 
		      text editor with the new file, remove the first 112 
		      lines.  These lines provide intructions to EREPS so 
		      help on a particular topic may be quickly found. 

     EREPS30.TXT  -   This ASCII text file.

     CNVRT2X3.EXE -   Utility program to convert your EREPS 2.x electro-
		      magnetic system files to the EREPS 3.0 format.  To use
		      this program, type CNVRT2X3 filename, where filename
		      is the name of your EREPS 2.x EM system file.  Wild
		      card characters (? and *) are allowed.  For example,
		      if all your EM system files have an SYS extension, you
		      would type CNVRT2X3 *.SYS.  You may also type CNVRT2X3
		      *.* and every file in the current directory will be 
		      examined.  If it is a system file that can be converted, 
		      you reveive a prompt for an action, either CONVERT, ALL, 
		      SKIP, or QUIT.  Selecting ALL will convert all files 
		      without further prompts.  If the file is not an EREPS EM 
		      system file, no action is taken.  You may run this 
		      program with a -c option (CNVRT2X3 -c filename).  The
		      file is only examined and the findings are reported. 
		      No action is taken upon the file.
				  ***   WARNING   ***
		      The converted file will retain its name.  If you want
		      to keep the unconverted file, save it with another name 
		      prior to the conversion.

4.0  What's new
	
     EREPS version 3.0 is an upgrade to version 2.2 released in December 1992.   
The propagation models of COVER, PROPR, and PROPH remain the same except for 
minor programming corrections and the inclusion of a new surface roughness
model.  Significant changes have been made to the RAYS program and to the 
entire EREPS user interface.  These changes are:
	
     (1)  Complete context-sensitive help is available at the push of the F1 
key.  The operation of all EREPS programs, a description of new user 
interface changes, and instructions on using new utilities are described in 
detail.  In addition, the help contains a complete description of all EREPS
initialization, user data, environmental, and binary format files.  Insure 
you use the help capability as it will answer many of your questions.  This 
help is designed to greatly reduce the need for a user's manual.  Feel free 
to call us with any unanswered questions however.
	
     (2)  Mouse support is much more dynamic.  You may move between program 
options, select items from pop-up menus, and customize the EREPS graphic 
displays with just a click of the mouse button.  
     
     (3)  EREPS customizing features are much more robust.  You may define 
colors, line and text styles, and program initialization preferences.
	
     (4)  The user-data file system has been expanded and structured similar 
to that of other programs such as Symantec Norton Commander or Microsoft 
Windows 3.1.  
     
     (5)  The RAYS program has been completely restructured and vastly 
expanded to include the following capabilities.
		
	  (a)  Additional methods of defining a modified refractivity profile 
are available.  These methods are:
	       
	       (1)  Numerical height versus M-units or N-units.
	       
	       (2)  Specify the profile's characteristics.
	       
	       (3)  Pressure, temperature, and humidity where humidity may be 
		    defined with relative humidity, dew point temperature, or 
		    dew point depression temperature.
	       
	       (4)  World Meteorological Organization (WMO) code.
	       
	       (5)  Drawing M-unit profile graphically.
	       
	       (6)  Evaporation duct profile calculated from bulk 
		    meteorological parameters or specified with Monin-Obukhov 
		    or Richardson stability parameters.
	       
	       (7)  Reading modified refractivity profiles from a file.
	  
	  (b)  The raytrace propagation model is now range-dependent.  Using 
the input option (7) above, up to 25 modified refractivity profiles at 
irregular ranges many be specified.  Range dependency allows for the 
examination of raytrace propagation through frontal boundaries, in varying 
surface-based and elevated ducting environments, and in fluctuating 
evaporation duct environments.
		
	  (c)  Any modified refractivity profile created with the RAYS 
program may be saved to a file.  This file may be used as an environmental 
input for the Radio Physical Optics (RPO) electromagnetic propagation model.  
A complete discussion of RPO, a range-dependent hybrid physical optics and 
parabolic equation EM propagation model, may be found in NCCOSC technical 
document 2403, "Radio Physical Optics CSCI Software Document," December 1992.  
The RPO model output may, in turn, be displayed with the COVER, PROPR, and 
PROPH programs.  It should be noted that the RPO program is not part of the 
EREPS 3.0 package.  Inquires about the RPO program distribution may be made 
to us at the above address.

     (6)  The SDS program no longer requires separate supporting map and data 
file.  The SDS.EXE program is completely stand-alone.

     (7)  Most special function key assignments have been altered.  If you
are familiar with using previous versions of EREPS, you should pay particular
attention to the new special function key labels.

     (8)  The surface roughness model in COVER, PROPR, and PROPH has been
replaced with the model from the International Radio Consultative Committee
Committee (CCIR) (1990), Volume 5.  Most users will not notice any difference
due to this revision.