[aprssig] APRS-WSPR APRS from anywhere!

Robert Bruninga bruninga at usna.edu
Mon Oct 10 22:21:43 CDT 2016


The total data is 55 bits. 7 for power, 15 for grid and 23 for callsign.
bob

On Mon, Oct 10, 2016 at 9:42 PM, Cory Vickruck <crvickru at lakeheadu.ca>
wrote:

> So from what I gathered you can send 22 characters total which includes
> the callsign and grid square?
>
> On Mon, Oct 10, 2016 at 7:48 PM, Robert Bruninga <bruninga at usna.edu>
> wrote:
>
>> Good point.  APRS WSPR would be like most APRS bulletins and status..
>> Directed to ALL.
>> But I think I will work on a simply possible QSO token.  A sender asking
>> for a reply would include a QSO token in his message and then the resposner
>> could use that token instead of a full call.
>>
>> Bob
>>
>>
>> On Mon, Oct 10, 2016 at 1:52 PM, crvickru <crvickru at lakeheadu.ca> wrote:
>>
>>> I am currious about the messaging aspect of this technique. How would
>>> yoy encode the destination of the message?
>>>
>>>
>>>
>>> Sent from my Samsung Galaxy smartphone.
>>>
>>> -------- Original message --------
>>> From: Earl Needham <earl.kd5xb at gmail.com>
>>> Date: 2016-10-10 10:42 AM (GMT-05:00)
>>> To: Robert Bruninga <bruninga at usna.edu>
>>> Cc: TAPR APRS Mailing List <aprssig at tapr.org>
>>> Subject: Re: [aprssig] APRS-WSPR APRS from anywhere!
>>>
>>> For many years, I've suggested using high speed CW.  You could then use
>>> just about any amateur radio frequency.  WSPR might have better decode, but
>>> CW is the "old stand by".
>>>
>>> Vy 7 3
>>> Earl
>>> KD5XB
>>>
>>> On Sun, Oct 9, 2016 at 1:20 PM, Robert Bruninga <bruninga at usna.edu>
>>> wrote:
>>>
>>>> The more I think about it the more I get excited about building up an
>>>> APRS-WSPR Gateway system.  With the 27 dB signal processing gain of WSPR,
>>>> then a 1W transmitter is the same as 1000 watts.  And for receive, since
>>>> APRS can have HF receivers everywhere, then this can really expand the
>>>> usefulness of APRS anywhere in the world including on the fringes of our
>>>> existing network.
>>>>
>>>> QST in September showed the $29 TAPR WSPR daughter board that plugs
>>>> onto a Rasberry pi and although it is only a 100 millliwatt transmitter,
>>>> with enough WSPRgates, that should not be a problem.  But adding a 1W PA
>>>> will always help!
>>>>
>>>> I already have come up with a compression technique that can improve on
>>>> the existing gridsquare (60x120miles) down to (18x12miles) and down to 3
>>>> miles or nearly a half mile for 5 and 4 letter calls.
>>>>
>>>> see http://aprs.org/aprs-wspr.html
>>>>
>>>> Lets get those WSPR boards on the air!
>>>>
>>>> Bob, WB4APR
>>>>
>>>>
>>>> _______________________________________________
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>>>> http://www.tapr.org/mailman/listinfo/aprssig
>>>>
>>>>
>>>
>>
>
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