[TheList] Internet linked PRS in CHCH?

Fri Apr 27 20:50:03 AEST 2012

What I took away from it was that they are modifying VOIP to have much
lower overhead (using low bit rate opensource codecs etc) so it can be used
in lower bandwidth applications (Think VOIP over VHF/UHF data links and I
hear talk of HF) and also modifying IP protocol to work "one to
may" efficiently.

Guess the sketchy bit is doing the data over UHF... P25 uses 9600 and crazy
modulation... if their getting the overhead down to something that could
work at 2400bps maybe AFSK is on the table...

I have visions of an open source digital radio that is affordable to create
and develop yourself...

Scanhead.

On 27 April 2012 19:33, Chris Hellyar <chris at logicalit.biz> wrote:

> That's an interesting article...
>
> But I don't think it requires development of independent mesh technologies.
>
> Mobile Internet is becoming almost ubiquitous now and if you've got a
> current technology smart phone you're in business right now.
>
> I've played a bit with iPTT on the iPhone and it's a pretty good PTT
> implementation although it's mostly non-english folks and rednecks from
> what I've heard. :-)
>
> The way I see it, If you're interested in radio you're probably 1/2 way to
> passing a hams ticket as it's not exactly the most challenging exam known
> to man.
>
> Then you can talk up a storm with relatively light regulations and there
> is no type approval or 'compliance' costs once you've got your ticket as
> such in this country at least.
>
> Sure you need to stick to the ham bands, use a call sign and play by some
> rules but there's no difference between that and getting your Drivers
> license as I see it.
>
> Just my 2c worth, rose coloured glasses and all that.
>
> Cheers, Me.
>
>
> On 27/04/12 17:51, Scanhead wrote:
>
>> Not a having a crack at anyone... But do you think its because rules,
>> regulations and compliance cost now stifle innovation and uptake? The
>> internet and its voice communications technology are reasonably open and
>> free of compliance and enjoy massive use in comparison.
>>
>> If you want to mix internet with PTT and "free park" radio bands (and not
>> have RSM come for you) I think this is where its headed:
>>
>> http://www.cnds.jhu.edu/pub/**papers/smesh_ptt_secon10.pdf<http://www.cnds.jhu.edu/pub/papers/smesh_ptt_secon10.pdf>
>>
>> Scanhead.
>>
>
>
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