Microwave Link Engineering Tool. MLET

[steveyoung]

My webtool calculates the distance and bearing between two markers. It also calculates the Rx level, Fade margin, FSL and unavailability of a link between these two markers in % and minutes/year. Furthermore if you give a required availability it will calculate the maximum link length you can achieve using given parameters and shows this graphically on the map.

You can try out my webtool at http://members.chello.at/stephen.joung/indexMW_Distance20.html Here is a short description of how to use the webtool.

You can zoom in and out with your mousewheel or by using the control in the left top corner. You move the map about by clicking with the left mousebutton and holding the button down while you drag the map.

You can enter markers three ways:

1. By clicking on the map where you would like to place a marker
2. By entering coordinates in the boxes provided above the map.
3. By entering an address in the box provided above the map. The resulting marker can then be dragged to the exact location required

The coordinates of the markers are then seen in DMS and Decimal degrees to the right of the map. Also the bearing from A-B and from B-A and the distance between the two markers can be seen. You can input Tx level, Rx Threshold, freq, polarization etc and the tool calculates the Rx level, Fade margin, FSL and unavailability of the link in % and minutes/year. You can change the parameters, ie Tx level or freq and the availability etc are automatically recalculated.

Toward the bottom of the form there is a box to input a required availability after you have done this you can press enter and the tool will calculate the max link length you can achieve with this availability and the freq, polarization, Tx level etc that you have chosen. Change any of the parameters and/or the availability required and the new max link length is automatically calculated. Click on either of the markers and the max link length is shown as a circle around the marker. Recalculate the link length with new parameters, ie horizontal polarization, new freq, Tx power etc and click on the marker again and a new circle is drawn representing the new link length. Click on any circle and info about this circle is given in a window. There is no limit to the amount of circles you can draw.

Another feature is dragable marker-B. Click on marker-B and the marker becomes dragable, drag it to a new location and release the button and all calculations are re-calculated for the new B location.

[John Wakeham]

It looks like I am the first to comment on your BB!! Your microwave applications have been very useful to me over the past year or so and I think the BB is a great idea and I hope that it will be successful.

John.