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[aprssig] Netbooks and APRS (was: APRS SDR)

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Sun Dec 12 22:03:26 UTC 2010


I use my own APRSIS32 (http://aprsisce.wikidot.com/) on my Acer Netbook 
under Windows XP.  It's an Intel Atom with 1GB RAM and works quite well 
when mobile.  If your netbook has bluetooth, you can even connect to a 
serial TNC if you add a bluetooth to serial adapter.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

r gilson wrote:
> Has anyone used  a net book for APRS?  How much ram and what program 
> did u use?  There are many netbooks out there and need some input 
> before investing.  Thanks
> WA2WWK
>
> --- On *Sun, 12/12/10, Matti Aarnio /<oh2mqk at sral.fi>/* wrote:
>
>
>     From: Matti Aarnio <oh2mqk at sral.fi>
>     Subject: Re: [aprssig] APRS SDR
>     To: "TAPR APRS Mailing List" <aprssig at tapr.org>
>     Date: Sunday, December 12, 2010, 11:05 AM
>
>     On Sun, Dec 12, 2010 at 10:03:16AM +1000, Andrew Rich wrote:
>     > Hello
>     >
>     > I wonder if any work has been done in making a software defined
>     APRS device ?
>     > In that the hardware is common but the features and TX and RX
>     are very much software derived ?
>     >
>     > - Andrew VK4TEC -
>
>     Lets see...
>
>     Old TAPR TNC2 did following in hardware:
>
>     1)  (AX.25) HDLC processing
>     2)  Bell202 AFSK
>     3)  DCD
>
>     Radios were pretty much hardware too, even single frequency xtal rigs.
>
>     The AX.25 and above it (alike APRS) have always been entirely
>     software.
>
>
>     The HDLC processing hardware is rather rare in modern microprocessors,
>     thus it is often done in software.  SDR you might say.
>
>     Bell-202 modems used to be "hardware", these days they are often
>     software.
>     If Bell-202 is software, then DCD is trivial addition on that
>     software.
>
>     There are several "DSP TNCs" around.
>
>     Having a special SDR hardware that takes application bits in on
>     one end,
>     and puts IF/RF waveforms out on other is usually seriously more
>     expensive
>     approach.  A mid-scale Xilinx Virtex-IV, and 100 Msps ADCs/DACs
>     does cost
>     several kilo-dollars, or more commonly tens of kilo-dollars.
>
>     Long ago there were 56kbps modems with early Xilinx FPGAs for waveform
>     generation and detection. One could say that WA4DSY was "software
>     defined",
>     as the used hardware is software reconfigurable.
>
>     73 de Matti, OH2MQK
>
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>
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>
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