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<FONT SIZE="4"><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Pretty much all of your standard wireless routers use 2.4ghz. 802.11b and 802.11g (virtually all of the wireless traffic) is 2.4ghz as are bluetooth devices. Bluetooth uses FHSS though where 802.11b/g use direct sequencing (DSSS) I believe...could be wrong on that last part, but I know they all use 2.4ghz.<BR>
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-M<BR>
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On 3/2/08 1:23 PM, "Del Rykert" <drykert2@rochester.rr.com> wrote:<BR>
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</SPAN></FONT></FONT><BLOCKQUOTE><FONT SIZE="4"><SPAN STYLE='font-size:11pt'><FONT COLOR="#0000FF"><FONT FACE="Arial">I thought many wireless devices were using the 2.4 GHz in homes and computer stuff. ? <BR>
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Del<BR>
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----- Original Message ----- <BR>
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<B>From:</B> Randall Bearden <a href="mailto:rbearden56@bellsouth.net"><mailto:rbearden56@bellsouth.net></a> <BR>
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<B>To:</B> NSRCA Mailing List <a href="mailto:nsrca-discussion@lists.nsrca.org"><mailto:nsrca-discussion@lists.nsrca.org></a> <BR>
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<B>Sent:</B> Sunday, March 02, 2008 9:13 AM<BR>
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<B>Subject:</B> Re: [NSRCA-discussion] Speaking of 2.4GHz<BR>
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</FONT></SPAN></FONT><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:9pt'>On 3/1/08 1:49 AM, "John Pavlick" <jpavlick@idseng.com> wrote:<BR>
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</SPAN></FONT></FONT><BLOCKQUOTE><FONT FACE="Arial"><SPAN STYLE='font-size:9pt'>Yeah, how many people experienced the bug in the early Spektrum stuff? We didn't hear too much about that one. The best part is they addressed it and used their resources to solve the problem quickly. Futaba is going through their teething pains now. NOTHING is perfect. It is in your best interest to use ANY new technology with extra caution until it develops a proven track record. I would be a little "extra" apprehensive about the XPS stuff only because it's not backed by large company like Futaba, JR or Airtronics. Small companies tend to have a harder time solving problems similar to the ones that we've seen with the Spektrum and Futaba systems.<BR>
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</FONT><FONT FACE="Arial">John Pavlick<BR>
<a href="http://www.idseng.com">http://www.idseng.com</a><BR>
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<B>From:</B> Ed Alt <a href="mailto:ed_alt@hotmail.com"><mailto:ed_alt@hotmail.com></a> <BR>
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<B>To:</B> NSRCA Mailing List <a href="mailto:nsrca-discussion@lists.nsrca.org"><mailto:nsrca-discussion@lists.nsrca.org></a> <BR>
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<B>Sent:</B> Saturday, March 01, 2008 12:15 AM<BR>
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<B>Subject:</B> Re: [NSRCA-discussion] Speaking of 2.4GHz<BR>
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Spektrum is going to come out with Telemetry for airborne radios. They've had it for years in their ground radios, so they have a handle on it. I also like the fact that their lead engineer who started the entire Spektrum line with Horizon came from Cypress Semiconductor, the chip vendor for the Spektrum stuff. Futaba has a great base of experience with Spread Spectrum. Their teething pains seem to have more to do with re-packaging their existing technology in a scramble to play catch-up with Spektrum. <BR>
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Every radio has problems here and there, as we've seen over the years with 72 mHz gear, so when I hear that something just totally died in a few isolated cases, it does not alarm me. However, "the big 3" have proven that they deliver good products overall and will address problems that do exist. XPS on the other hand has made some questionable claims and really has no solution to provide path diversity for the receiver. If you look at Futaba and also Airtronics full range SS receivers, they get path diversity from placing each antenna at the end of thin coax leads that allow them to each have a unique RF environment, much like Spektrum accomplishes with actual receivers at the end of data leads that feed a central unit. <BR>
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If it was me trying to use XPS, I would spend a couple of years test flying it in stuff I could afford to lose, same as I did with Spektrum when it first came out. I wounded a foamy with a AR6100 receiver that had an early firmware bug, which Horizon acknowledged and fixed. It had nothing to do with radio reception; it was the one that would slap down elevator and stay there. Nice! Since then, all of my foamy kills have been directly traceable to my thumbs.<BR>
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Ed<BR>
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Date: Fri, 29 Feb 2008 14:17:06 -0800<BR>
From: edvwhite@sbcglobal.net<BR>
To: nsrca-discussion@lists.nsrca.org<BR>
Subject: Re: [NSRCA-discussion] Speaking of 2.4GHz<BR>
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Ed,<BR>
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I've been digging into (ie, poking around RCU) for XPS issues and as is usually the case find mostly secondhand and anecdotal problems along with a few really unhappy people. I also find a lot of happy XPS users. I am attracted to the XPS because it offers the future possibility of telemetry, something I would like to play with. Lastly on the Spektrum, I've seen only a handful of systems fly at our local field. I've also seen two crashes on two different Spektrum systems due to total loss of control, at close range. At least one of those verified good battery voltage under load after the crash (the other one didn't check). <BR>
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I know there are a huge number of satisfied Spektrum users. I know of two locally who are not quite so satisfied. Neither ever did figure out the reason for the loss of control. And with Futaba's recent problem (which they have fixed), well I think we all have to realize there is no bulletproof system. Just looking to see if people have had problems with the XPS.<BR>
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Ed<BR>
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<B><I>Ed Alt <ed_alt@hotmail.com></I></B> wrote: <BR>
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</FONT></SPAN><BLOCKQUOTE><SPAN STYLE='font-size:9pt'><FONT FACE="Verdana, Helvetica, Arial"> With a proven solution from Spektrum / JR and with Futaba introducing what will undoubtedly be a solid solution, why play with XPS? I can't think of any advantage that it offers and it apparently has some issues to dig into and understand. <BR>
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Ed<BR>
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<HR ALIGN=CENTER SIZE="3" WIDTH="100%"> Date: Fri, 29 Feb 2008 08:44:14 -0800<BR>
From: edvwhite@sbcglobal.net<BR>
To: nsrca-discussion@lists.nsrca.org<BR>
Subject: [NSRCA-discussion] Speaking of 2.4GHz<BR>
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Anybody have experience with the xtremelink systems?<BR>
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<a href="http://www.xtremepowersystems.net/">http://www.xtremepowersystems.net/</a><BR>
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Ed<BR>
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<B><I>Ken Thompson <kthompson@stx.rr.com></I></B> wrote: <BR>
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</FONT><FONT FACE="Arial">That's pretty cool, thanks for bringing this to the list. I saw this in the Flying Giants first thing this morning.<BR>
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----- Original Message ----- <BR>
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<B>From:</B> Kevin Brice <a href="mailto:kevinbrice@earthlink.net"><mailto:kevinbrice@earthlink.net></a> <BR>
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<B>To:</B> nsrca-discussion@lists.nsrca.org <BR>
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<B>Sent:</B> Thursday, February 28, 2008 11:25 AM<BR>
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<B>Subject:</B> [NSRCA-discussion] The Great 2.4GHz DSM Giveaway<BR>
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</FONT></SPAN><FONT FACE="Verdana, Helvetica, Arial"><FONT COLOR="#000080"><FONT SIZE="4"><SPAN STYLE='font-size:10pt'>For those on the 2.4 fence, this may encourage you to upgrade to DSM.<BR>
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</SPAN><FONT COLOR="#000080"><FONT SIZE="4"><SPAN STYLE='font-size:10pt'>I am not sure if the html graphics will show so here is the link to Spektrum’s Receiver Giveaway. <BR>
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</SPAN><FONT COLOR="#000080"><FONT SIZE="4"><SPAN STYLE='font-size:10pt'><a href="http://www.spektrumrc.com/giveaway/">http://www.spektrumrc.com/giveaway/</a> <BR>
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Kevin Brice<BR>
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kevinbrice@earthlink.net <BR>
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</SPAN><FONT SIZE="4"><SPAN STYLE='font-size:10pt'><B>From:</B> Spektrum Signal [<a href="mailto:webmaster@spektrumrc.com]">mailto:webmaster@spektrumrc.com]</a> <BR>
<B>Sent:</B> Thursday, February 28, 2008 10:00 AM<BR>
<B>To:</B> kevin@wenzlerarchitects.com<BR>
<B>Subject:</B> The Great 2.4GHz DSM Giveaway<BR>
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<FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:9pt'> </SPAN><FONT SIZE="2"><SPAN STYLE='font-size:7.5pt'><B>February 28, 2008 </B></SPAN></FONT><SPAN STYLE='font-size:9pt'>
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</SPAN><FONT SIZE="2"><SPAN STYLE='font-size:7.5pt'>PLEASE VISIT <FONT COLOR="#FFFFFF">WWW.SPEKTRUMRC.COM/GIVEAWAY</FONT> <a href="http://publications.horizonhobby.com/t/322561/1056524/7046/0/"><http://publications.horizonhobby.com/t/322561/1056524/7046/0/></a> FOR MORE INFORMATION<BR>
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<HR ALIGN=CENTER SIZE="3" WIDTH="100%"> Climb to the top of the charts! Play the word scramble challenge with star power. Play now! <a href="http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan"><http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan></a> _______________________________________________<BR>
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<HR ALIGN=CENTER SIZE="3" WIDTH="100%"> I am curious what “noise” from a house is detectable on a Spectrum Analyzer tuned to a center frequency of 2.4 GHz? Not even a 900 MHz wireless phone would even come close. Microwave? No wrong frequency, Wi Fi networks? No, wrong frequency. Granted if you tune the analyzer’s center frequency well beyond 2.4 you might be able to see other signals or noise but the narrow bandwidth the 2.4 operates in and the clean signal/noise ratio doesn’t lend itself to the idea of house noise causing interference. Also, unless you can narrow the display bandwidth way down then you won’t see any frequency “hopping”. The shift is very close to the carrier and unless you know what to look for then you can miss it. <BR>
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