<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I suppose it depends upon the APRS client but those I am familiar with need little in resources to run. UI-View ran on almost nothing, for example, and has lots of features.<br><div><div>On Dec 12, 2010, at 10:59 AM, r gilson wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font: inherit;"><div>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</div>
<div>WA2WWK<br><br>--- On <b>Sun, 12/12/10, Matti Aarnio <i><<a href="mailto:oh2mqk@sral.fi">oh2mqk@sral.fi</a>></i></b> wrote:<br></div>
<blockquote style="BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><br>From: Matti Aarnio <<a href="mailto:oh2mqk@sral.fi">oh2mqk@sral.fi</a>><br>Subject: Re: [aprssig] APRS SDR<br>To: "TAPR APRS Mailing List" <<a href="mailto:aprssig@tapr.org">aprssig@tapr.org</a>><br>Date: Sunday, December 12, 2010, 11:05 AM<br><br>
<div class="plainMail">On Sun, Dec 12, 2010 at 10:03:16AM +1000, Andrew Rich wrote:<br>> Hello<br>> <br>> I wonder if any work has been done in making a software defined APRS device ?<br>> In that the hardware is common but the features and TX and RX are very much software derived ?<br>> <br>> - Andrew VK4TEC - <br><br>Lets see...<br><br>Old TAPR TNC2 did following in hardware:<br><br>1) (AX.25) HDLC processing<br>2) Bell202 AFSK<br>3) DCD<br><br>Radios were pretty much hardware too, even single frequency xtal rigs.<br><br>The AX.25 and above it (alike APRS) have always been entirely software.<br><br><br>The HDLC processing hardware is rather rare in modern microprocessors,<br>thus it is often done in software. SDR you might say.<br><br>Bell-202 modems used to be "hardware", these days they are often software.<br>If Bell-202 is software, then DCD is trivial addition on that software.<br><br>There are several "DSP
TNCs" around.<br><br>Having a special SDR hardware that takes application bits in on one end,<br>and puts IF/RF waveforms out on other is usually seriously more expensive<br>approach. A mid-scale Xilinx Virtex-IV, and 100 Msps ADCs/DACs does cost<br>several kilo-dollars, or more commonly tens of kilo-dollars.<br><br>Long ago there were 56kbps modems with early Xilinx FPGAs for waveform<br>generation and detection. One could say that WA4DSY was "software defined",<br>as the used hardware is software reconfigurable.<br><br>73 de Matti, OH2MQK<br><br>_______________________________________________<br>aprssig mailing list<br><a href="http://us.mc1102.mail.yahoo.com/mc/compose?to=aprssig@tapr.org" ymailto="mailto:aprssig@tapr.org">aprssig@tapr.org</a><br><a href="https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig" target="_blank">https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig</a><br></div></blockquote></td></tr></tbody></table><br>
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