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[aprssig] APRS radios

Steve Grantham aa5sg-2 at sera.org
Sat May 24 23:50:42 UTC 2008


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----- Original Message ----- 
From: "Joel Maslak" <jmaslak-aprs at antelope.net>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Saturday, May 24, 2008 6:26 PM
Subject: Re: [aprssig] APRS radios


> On May 24, 2008, at 4:53 PM, Bob Bruninga wrote:
>> APRS is really quite simple.  There are only 4 types of packets,
>> position, status, message and queries.  All one has to do is
>> capture them and display them.  And provide a simple user interface...
>
>
> That's a slight bit of an understatement.
>
> I asked about bulletins yesterday.  Yep, that's a message packet,
> sure, well...maybe just almost, it doesn't have a sequence number.
> To fully implement the "message" types of packets, you have to do a
> bunch of special bulletin processing.  Then you have to think about
> third party packets...
>
> Position packets have at least three major variations that I can
> think of off the top of my head - raw GPS strings (and two different
> strings might be sent), compressed, and MIC-E.  Then there are
> objects, which is a type of position packet, but...
>
> The thing that makes the APRS spec very difficult to fully implement
> is that things were just randomly added on.  As a result, people
> implement the parts they need to get their immediate need met and
> prioritize the other parts as lower priority - because everything in
> APRS seems to be a "special case".  And as we all know, no software
> program every is "finished".  (well, except APRSDOS!)
>
>
>> Interesting to hear you complain.  Teenagers have no problem text
>> messaging using their phone pads and in fact, seem quite happy with
>> it.  We have had local/global text messaging and email built into a
>> ham radio APRS HT since 1998 (the D7).
>
>
> I'm no teenager - I don't have the motor control or the
> eyesight!  :)  But I do use a smartphone with keyboard - a much
> better design for heavy messaging.  The touch tone pad is great for
> "mostly telephone calls with some messaging, or a bored teenager".
> The keyboard is a better two-way text communication tool.
>
>
>> In the mean time, I have sure had 10 years an a lot of fun with it...
>
> Yes, me too.
>>
>> Its amazing the kind of communicaitons we can acomplish if we just
>> do it...
>
>
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