[aprssig] APRN news from Dayton!

Mon May 23 15:52:51 EDT 2011

On 5/23/2011 11:48 AM, Bob Bruninga wrote:
>
> Which I hope will become a simple download for anyone to set up anywhere.
> Another way to send in the pictures might be via IRLP, Echolink, D-star or
> Wires...?  With the loss of the Kenwood VC-H1 camera there has been no
> incentive for future APRN sites.  Now I hope we can get moving again...
>

Won't work on these Internet links.  I've tried this over Echolink & Skype.    
The voice-centric lossy high-compression codecs used to achieve lot-bit-rate IP 
streams in these systems absolutely destroy the phase and amplitude integrity 
of tones for modes like SSTV or packet.  (When you overdial DTMF tones in 
Echolink to function a repeater or remote base (or the distant Echolink client 
itself) at the far end, the tones are actually decoded locally, sent as 
something like an ASCII data stream over the IP link,  and then regenerated 
into tones at the far end.)

However, there is an alternative.

IP-Sound is a Free application for audio exchange client to client over a 
TCP/IPv4 network (Lan/Internet). The main purpose for the existence of IP-Sound 
is to provide low quality audio 8-16kHz, with low latency for use together with 
remote control software for "ham" radio amateur equipment. IP-Sound is 
developed by SM5VXC.

It can be used to transport the audio part of a ham remote-control setup (i.e. 
the mike and speaker audio) end-to-end over a network or Internet connection. 
The advantage of IP-Sound over systems like Skype, MS Netmeeting or Echolink is 
that it can use lossless codecs that won't mangle the phase/amplitude integrity 
of audio signals received by the sound card. This is critical to operating 
modes like PSK31 and SSTV.

The downside is that the IP data link runs at a constant 50-100 KB/s data rate, 
compared to the variable 5-20 KB/sec rate of the other systems; i.e. it's more 
like the standard 64KB/sec toll-grade voice channel of a telco T-1 link.

-------------------------------------------------------------------------------

--

Stephen H. Smith    wa8lmf (at) aol.com
EchoLink Node:      WA8LMF  or 14400    [Think bottom of the 2M band]
Skype:        WA8LMF
Home Page:          http://wa8lmf.net

=====  Vista & Win7 Install Issues for UI-View and Precision Mapping =====
     http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7

*** HF APRS over PSK63 ***
    http://wa8lmf.net/APRS_PSK63/index.htm

"APRS 101"  Explanation of APRS Path Selection & Digipeating
   http://wa8lmf.net/DigiPaths

>> And Kenwood then bungled the product..
> I agree there... Mostly in marketing it without showing ALL of its features!
> But that is why I am excited to see this new micro hand-held SSTV camera....
>>> and it was years ahead of the cellphone camera, now we're back!
>> Back at about 1/50th(!) the resolution of cellphone
>> cameras.   One can achieve a VASTLY better live SSTV
>> system by using a $225 Asus or Acer netbook.
> Agreed.  But there is nothing like something the size of a golf ball in your
> hand and plugged into your HT mic jack, compared to carrying around a PC and
> only working when in range of WIFI.  I agree with you 100% that there are
> other ways to do it, but still using laptops for in-the-field SSTV has not
> caught on enough to keep APRN alive.  Mostly because (as you say) anyone can
> do it with a cell phone.  But I am talking about for when cell phones don't
> work.  That's when Ham radio needs alternatives.
>
>> I am now playing around with combining... soundcard-based
>> APRS Messenger application with MP73-N narrow SSTV for an
>> APRN solution for 30M HF.
> Wow, that would be fun.  Great to see those ideas.  But I'm very interested
> in something with me in the car or out of the car in the field that I can
> use during emergency comms.
>
>> I have had mmSSTV (for analog SSTV) and EasyPal
>> (for digital SSTV) running simultaneously on the
>> sound system of a Dell 866 MHz Pentium III, along
>> with the AGWpe packet app for a complete entirely
>> software-based APRN dual-mode (analog + digital)
>> receive setup.
> Wow, thanks for keeping us all informed of Ham Radio ways to send and
> receive more pictures.  I admit I am not in tune with the latest.  Your
> recommendations and ideas are great.
>
> Bob, WB4APR
>
>
>
>
> ----------------------------------------------------------------------------
> ---
>
> --
>
> Stephen H. Smith    wa8lmf (at) aol.com
> EchoLink Node:      WA8LMF  or 14400    [Think bottom of the 2M band]
> Skype:        WA8LMF
> Home Page:          http://wa8lmf.net
>
> =====  Vista&  Win7 Install Issues for UI-View and Precision Mapping =====
>       http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7
>
> *** HF APRS over PSK63 ***
>      http://wa8lmf.net/APRS_PSK63/index.htm
>
> "APRS 101"  Explanation of APRS Path Selection&  Digipeating
>     http://wa8lmf.net/DigiPaths
>
>
>
>
>
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
>
>
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig