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• Good stuff! I wrote a program that calculates your grid square, from your longitude and latitude. If you have a gps, get your long/lat, and plug it into my
Message 1 of 4 , Apr 4, 2010
Good stuff!

I wrote a program that calculates your grid square, from your longitude and latitude. If you have a gps, get your long/lat, and plug it into my qrp distance calculator.

http://www.hoffswell.com/n9ssa/mpwcalc.html

I wrote the tool long ago to calculate the distance between two points on earth, and then the miles per watt for a communication over that distance. Yay QRP! Some of you might remember my QRP Challenge from long ago!

73 de n9ssa

--- In k8daa@yahoogroups.com, K8TB <k8tb@...> wrote:
>
> I have received emails from two people who expressed puzzlement
> when I gave the grid square of my six meter beacon as EN62wu. They both
> knew that the grid square for the Holland area is EN62, but they didn't
> know what the two additional elements were for.
>
> Around this area of the world, a 4 digit grid square is around 100
> miles wide and 70 miles tall. The EN62 grid square, which contains
> Holland, MI, also contains South Haven, Benton Harbor, and it jumps
> across Lake Michigan and includes the NE area of Chicago, Racine,
> Wisconsin and the SE area of Milwaukee. This is a large area.
>
> If you go to the ARRL web site on grid squares, this is explained
> rather well:
> http://www.arrl.org/locate/gridinfo.html
>
> When the Maidenhead system was designed, a 4 digit grid square is
> to be 1 degree of latitude and 2 degrees of longitude. The Maidenhead
> people then added the two digits to define a smaller area. The area is
> now 2.5 minutes worth of latitude tall and 5 minutes worth of longitude
> wide. This neatly divides a four digit grid square into tiny slices
> 1/24th as wide and tall, meaning the resolution is 576 times greater.
>
> But by adding the two additional letters, we can now identify an
> area that is only 3 miles tall by 4 miles wide, such as EN62wu.
>
> If you are interested in what your six digit grid square is, QRZ
> offers a good guess. Most of the time, it is very accurate, but be
> careful as the QRZ program can be faked out by local road addresses.
>
> If you would really like to find your six digit grid square, use an
> online resource that ties into Google Maps:
>
> Go to:
>
> http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=13877
>
>
> Click on the line just below the top:
>
> "** Full-screen version with gridsquare limits here <fullScreen.php> -*"
>
> * This takes you to a page that shows the Google map. Click on and
> drag the map over to your area, and zoom in. Then double click on your
> house address, and the program will give you the six digit grid square.
> Zoom out, and you can see the limits of this 6 digit grid square.
> As an example, the Holland HARC clubhouse is EN62ws and the GRARA Red
> Cross locations is EN72ex.
>
> Many of the logging programs can use the six digit grid squares to show
> the azimuth between the two points, for a much superior antenna pointing
> accuracy.
>
> tom bosscher k8tb "EN72bv" !
>
> * *
>
• Great program Pete. Always good to meet a fellow ham/computer geek. I ve been reading up on QRP operation as well. I find that I am fascinated by the challenge
Message 2 of 4 , Apr 4, 2010