PATHPLAN README.TXT



DON'T FORGET TO OPEN CABLEDAT.ZIP



This program is intended to be used as an aid in developing and determining a suitable path for microwave communications.  

While it should come close to approximating the received signal, it is by no means the total answer to designing a microwave system.  The user is cautioned that many factors contribute to path's performance and the ultimate responsibility of designing the path is solely that of the user.  In other words, theory does not always work in the real world.

I don't believe there are any bugs in this program but if you do notice any, please contact me.  The same holds for any ideas for programs, and comments for or against this program.  I am always happy to receive feedback.

PROGRAM OPERATION REGISTERED VERSION

The first screen allows the user to input a frequency then by using the 'GO' button the program will usually display more than one waveguide or coax that might be usable on that frequency.  The reason I put in a number of items is that in some instances you may already have the coax or waveguide on hand and not wish to purchase other types.  Use the 'SKIP' button to bypass this function and go directly to the data input page.

If the user used the 'GO' button they will now see the choices of coax or waveguide.  Clicking on any of them will show the approximate loss per 100' of line not including connectors.  You also have the opportunity to select a different line for the receiving end if you desire, otherwise, the same line will be used in the calculations.

The path data screen is where you enter all the known information starting with the transmit power level.  Again, you have a choice.  You either enter it as DBm or Watts.  Then continue with the other requested information.  In some cases a transmitter will be used as a driver with an amplifier at the end of the line just before the antenna similarly a preamp could be used at the receiving dish before the signal heads down the line.

Path distances can be entered in one of two ways.  If the latitude and longitude of both ends are known, entering them will allow the program to calculate the distance.  If there is anything other than '0' in these boxes, the program will try to calculate and ignore the box labeled path distance.  If you choose to use the path distance box, be sure '0's are displayed in the latitude and longitude boxes.  Enter the distance in miles or kilometers.

Other items that can be entered or changed are: inputting a fade margin, a frequency, if not entered at the opening, and changing the earth factor which is set for a 1.33 default value.

The results page is fairly simple.  Fresnel zone dips and earth bulge are given as general information should the person using the program have a use for them.  

I've used the associated formulas with a calculator for some time and have never experienced a problem.  If  you have a problem with some portion of this program I would appreciate hearing about it.

Thank you and good luck.

Dave Kushman
d_l_k@email.com


