[aprssig] APRStt 4 digit grid squares...

Robert Bruninga bruninga at usna.edu
Sun Feb 15 16:32:09 CST 2015


Those get their first digit from the 3 orange squares off the East coast of
the USA.

On Sun, Feb 15, 2015 at 3:11 PM, Jeff Dugas (Mobile) <N5TEV at compuserve.com>
wrote:

> Bob,
>
> On the map, how does it work for the 3-square red box (1-2-3) in the area
> over Indonesia?
>
> Jeff
> N5TEV
>
> -----Original Message-----
>
> Robert Bruninga <bruninga at usna.edu> wrote:
>
> Thanks everyone, for all the GRID ideas.  But here is what we think we
> have decided to go with for the worldwide 4 digit DTMF Grid map we will use
> on QIKcom-2.
>
>
>
> http://aprs.org/qikcom-2.html
>
>
>
> It uses a table from 00 to 99 to map to the first two ALPHA characters.
>
>
>
> Bob, WB4aPR
>
>
>
> *From:* aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] *On
> Behalf Of *George Vastianos
> *Sent:* Saturday, February 14, 2015 5:13 PM
> *To:* TAPR APRS Mailing List
> *Subject:* [aprssig] Σχετ: proposal for APRStt grid loc. Σχετ: 60 Grid
> Square............
>
>
>
> Oh SORRY!
>
>
>
> Thanks for the correction!
>
>
>
> I had in my mind that you have to look for the first letter on the black
> row below and then look for the second letter on the black column on
> left... so i wrote "Row 1st, Col 2nd" BUT THIS IS WRONG
>
>
>
> The correct is "Col 1st, Row 2nd" that means "Find the Column of 1st
> letter and then the Row of 2nd letter"
>
>
>
> e.g.  KM = 502, NQ=536, UW=902
>
>
>
> THANKS AGAIN!
>
>
>
>
> ------------------------------
>
> *Απο:* Lynn W. Deffenbaugh (Mr) <ldeffenb at homeside.to>
> *Προς:* TAPR APRS Mailing List <aprssig at tapr.org>
> *Στάλθηκε:* 11:57 μ.μ. Σάββατο, 14 Φεβρουαρίου 2015
> *Θέμα:* Re: [aprssig] proposal for APRStt grid loc. Σχετ: 60 Grid
> Square............
>
>
>
> Pardon my literalness, but if you say "Row 1st, Col 2nd", then for KM I'd
> go to row K up the right side and column M across the bottom and get 520
> whereas your example says it's 502 which seems to be column K and row M?
>
> More than one example would make it more clear for those of us that need
> to see what you're talking about.
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 2/14/2015 7:33 AM, George Vastianos wrote:
>
>
>
> Hello Bob
>
> IMO in APRStt the conversion between grid and numbers should be very easy
> in a way that no calculation algorithm will be needed by the user and only
> a small printed table will be enough. In this way with a small printed
> paper in the pocket and the low cost HT anyone could define his position in
> the APRS system (of course if he knows his position and if there is APRStt
> infrastructure in his area...)
>
> In the attached file (PNG picture) you can find my proposal for a simple
> conversion table
>
> the result is that you add a group of 3 number-digits for each 2 letters
> of the grid
>
> eg. KM = 502, KM17 = 50217, KM17uw = 50217902, KM17uw48 = 5021790248
>
> based on the fact that my proposal uses only the 0-9 digits and not the
> *,#,A-D this makes it compatible with the APRStt format.
>
> The conversion table was designed in a way that the conversion from the
> number to ascii will be very easy (even for 8-bit microcontrollers) and
> will not require usage of memory lookup tables.
>
> Below is a sample code (in basic style) that will convert the 3-digit
> number into the Grid Square letter characters (e.g. for i=502 then Chr(C1)
> becomes "K" and Chr(C2) becomes "M")
>
> ----------------------------
>
> 'example I=536 will print "NQ"
>
> Dim I, X, CO1, CO2, C1, C2 As Integer
> I = 536
> If (I >= 100 And I < 340) Then
>     CO1 = 10: CO2 = 65
> ElseIf (I >= 400 And I < 640) Then
>     CO1 = 40: CO2 = 75
> ElseIf (I >= 700 And I < 940) Then
>     CO1 = 70: CO2 = 85
> End If
> X = Int(I / 10)
> C1 = 65 + X - CO1
> If C1 < 65 Or C1 > 88 Then End 'ERROR i is outside limits
> C2 = I - X * 10 + CO2
> If C2 < 65 Or C2 > 88 Then End 'ERROR i is outside limits
> MsgBox Chr(C1) & Chr(C2)
>
> --------------------------
>
> In the above sample code the C1 and C2 are integers that contain the ASCII
> value of the 2 characters..... This proposal is not only for the satellite
> app but for the APRStt in general.
>
> 73
>
> sv8gxc
>
>
>
> P.S. The limit of 40KB in aprssig list....really sucks! i tried 3 times to
> send the same email until it fits in limits. SORRY in case you received
> multiple times the same message (e.g. amsat-bb)
>
>
>
>
>
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