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Re: [HARC] Re: About Grid Squares

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  • Nathan Silva
    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 1 of 4 , Apr 4, 2010
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      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 of getting the maximum distance out of each watt of transmission power. 73s
       
      Nate

      --- On Sun, 4/4/10, Peter <pete@...> wrote:

      From: Peter <pete@...>
      Subject: [HARC] Re: About Grid Squares
      To: k8daa@yahoogroups.com
      Date: Sunday, April 4, 2010, 8:25 AM

       
      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.hoffswel l.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" !
      >
      > * *
      >


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