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EngineerGuy314 / pico-WSPRer

Minimalist WSPR tracker for pico-balloons utilizing Raspberry Pi Pico (or Rp2040) as the RF generator (aka The Cheapest Tracker In The World™). More info: [WIKI](https://github.com/EngineerGuy314/pico-WSPRer/wiki/pico%E2%80%90WSPRer-(aka-Cheapest-Tracker-in-the-World%E2%84%A2))
MIT License
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Grid Co-Ordinates not as expected #1

Closed sivaelid closed 8 months ago

sivaelid commented 8 months ago

Having used the V2 Code, I find that the reported grid is incorect. I have check several GPS receivers and my QTH is IO81wk49 with co-ordinates of lat 51.4559367° Lng -2.1259093°

Using the code I had displayed at the same l,ocation lat 512736246 and long -20754834 . This showed a grid of IO 81xg so It seems to have some error in 5th and 6th character. The Square is 5 grids south and 1 grid east of the actual square .

I hope this helps Simon G8HAM

EngineerGuy314 commented 8 months ago

I had noticed something similar, and assumed that the raw data coming from the inexpensive GPS was off. But I will investigate further, thank you for the comment.

sivaelid commented 8 months ago
Hi I have been looking to day at the issue, and how Co-ordinates to maidenhead is done . I have swapped 3 Different makes of GPS and with different NEMA Message  $GPRMC and $GNRMC. All give the correct co-ordinates but are  always giving the incorrect Grid. I have come to the conclusion so far that It may be  the rounding down element  of the sub-Square element that  is incorrect. If you add or subtract the  1 to the se values you can make it correct . Still looking If I find issue  then will let you know.  PS some great work so far . I would say that looking on wspr with the current build I am  not getting manay sport comare to the normal ones. Frequency Ok but ? changes in coding of message. Any Way that for your creative thought and skills Simon G8HAM  Sent from Mail for Windows From: EngineerGuy314Sent: 06 April 2024 15:10To: EngineerGuy314/pico-WSPRerCc: Si; AuthorSubject: Re: [EngineerGuy314/pico-WSPRer] Grid Co-Ordinates not as expected (Issue #1) I had noticed something similar, and assumed that the raw data coming from the inexpensive GPS was off. But I will investigate further, thank you for the comment.—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***> 
EngineerGuy314 commented 8 months ago

bug found and corrected! the gps parser code i started with assumed lat/lon were sent as decimal, when in fact they come as that stupid degree/minute.minute format.

sivaelid commented 8 months ago
Brill Well done Sent from Mail for Windows From: EngineerGuy314Sent: 06 April 2024 17:17To: EngineerGuy314/pico-WSPRerCc: Si; AuthorSubject: Re: [EngineerGuy314/pico-WSPRer] Grid Co-Ordinates not as expected (Issue #1) bug found and corrected! the gps parser code i started with assumed lat/lon were sent as decimal, when in fact they come as that stupid degree/minute.minute format.—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>