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Not every feature of the Zigbee protocol offer an advantage in a real time RC environment; for example, retries. Retries are useful when you don't want to lose the tip of Grandma's nose when transmitting a jpeg picture, but not all that useful if the receiver tries to initiate a retry, then expects a response that may never come, or may not come in time before the next data frame is ready to be transmitted. On the other hand, Spektrum has two simultaneous paths going at all times, along with path diversity due to the arrangement of remote receivers, so the chance of missing a packet is reduced to begin with. Regardless of how many other, diverse applications the Maxstream stuff may be used successfuly in, the reality of some model airplane applications is that some measure of path diversity is important. Maybe XPS will offer a simple change, like Futaba and Airttronics already have, to extend the antenna out on coax to allow them to be oriented in a more effective way.<BR>
<BR>
Physics don't change from one 2.4 gHz signal to the next, so regardless of where else in the world a Maxstream receiver is working, what matters most of all is that at least one antenna of the one installed in your airplane is exposed to a good signal, regardless of model orientation, or what piece of metal or CF may be installed in the model.<BR>
<BR>
Ed<BR><BR><BR>
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From: tjs@mail.global-electronics.com<BR>To: nsrca-discussion@lists.nsrca.org<BR>Date: Sat, 1 Mar 2008 12:21:31 -0700<BR>Subject: Re: [NSRCA-discussion] Speaking of 2.4GHz<BR><BR>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hello everyone!</SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">If you look closely at the pictures of the XPS product, you see a small daughterboard module. This is made by a very large company called Maxstream <A href="http://www.maxstream.net/" target=_blank>http://www.maxstream.net/</A>. All of the radio stuff is handled by this module – including the frequency hopping etc. From a small company point of view, this was an excellent design decision (I use them too in my product – not RC stuff) since all of the governmental approvals have been done by someone else, all of the costly design and development, improvements – all by a larger organization. </SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Additionally, since Futaba and JR both went the route of designing their own from scratch, they would have to debug all of their own problems. Also, since Maxstream’s product is in MANY MANY different and diverse industries and used by thousands of engineers (unlike JR and Futaba to a large extent), the problems would be worked out to a much finer point that just used by modelers in their environment.</SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">My $0.02 …</SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Tim</SPAN></FONT></P>
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<P class=EC_MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>John Pavlick<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, February 29, 2008 11:49 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> NSRCA Mailing List<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [NSRCA-discussion] Speaking of 2.4GHz</SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">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.</SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">John Pavlick<BR><A href="http://www.idseng.com/" target=_blank>http://www.idseng.com</A></SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> <A title=ed_alt@hotmail.com href="mailto:ed_alt@hotmail.com">Ed Alt</A> </SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">To:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sent:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Saturday, March 01, 2008 12:15 AM</SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Subject:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Re: [NSRCA-discussion] Speaking of 2.4GHz</SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">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> <BR>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> <BR>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> <BR>Ed</SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><BR>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><BR>Ed,<BR><BR>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><BR>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><BR>Ed<BR><BR><B><I><SPAN style="FONT-WEIGHT: bold; FONT-STYLE: italic">Ed Alt <ed_alt@hotmail.com></SPAN></I></B> wrote: </SPAN></FONT></P>
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<P class=EC_MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">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> <BR>Ed<BR><BR></SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">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><BR>Anybody have experience with the xtremelink systems?<BR><BR>http://www.xtremepowersystems.net/<BR><BR>Ed<BR><BR><B><I><SPAN style="FONT-WEIGHT: bold; FONT-STYLE: italic">Ken Thompson <kthompson@stx.rr.com></SPAN></I></B> wrote: </SPAN></FONT></P>
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<P class=EC_MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">That's pretty cool, thanks for bringing this to the list. I saw this in the Flying Giants first thing this morning.</SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">----- Original Message ----- </SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal style="BACKGROUND: #e4e4e4"><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">From:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A title=kevinbrice@earthlink.net href="mailto:kevinbrice@earthlink.net">Kevin Brice</A> </SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">To:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A> </SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sent:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Thursday, February 28, 2008 11:25 AM</SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><B><FONT face=Arial size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Subject:</SPAN></FONT></B><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> [NSRCA-discussion] The Great 2.4GHz DSM Giveaway</SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">For those on the 2.4 fence, this may encourage you to upgrade to DSM.</SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I am not sure if the html graphics will show so here is the link to Spektrum’s Receiver Giveaway. </SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><A href="http://www.spektrumrc.com/giveaway/" target=_blank>http://www.spektrumrc.com/giveaway/</A> </SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Kevin Brice</SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV>
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<P class=EC_MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><A href="mailto:kevinbrice@earthlink.net">kevinbrice@earthlink.net</A> </SPAN></FONT><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN></FONT></P></DIV></DIV>
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<P class=EC_MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Spektrum Signal [mailto:webmaster@spektrumrc.com] <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, February 28, 2008 10:00 AM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> <A href="mailto:kevin@wenzlerarchitects.com">kevin@wenzlerarchitects.com</A><BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> The Great 2.4GHz DSM Giveaway</SPAN></FONT></P></DIV></DIV>
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<P class=EC_MsoNormal style="TEXT-ALIGN: center" align=center><FONT face=Arial color=#cccccc size=1><SPAN style="FONT-SIZE: 8.5pt; COLOR: #cccccc; FONT-FAMILY: Arial">PLEASE VISIT <A href="http://publications.horizonhobby.com/t/322561/1056524/7046/0/" target=_blank><FONT face=Verdana color=white><SPAN style="COLOR: white; FONT-FAMILY: Verdana">WWW.SPEKTRUMRC.COM/GIVEAWAY</SPAN></FONT></A> FOR MORE INFORMATION</SPAN></FONT></P></TD></TR>
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<P class=EC_MsoNormal style="TEXT-ALIGN: center" align=center><FONT face=Verdana color=#cccccc size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: #cccccc; FONT-FAMILY: Verdana">Copyright © 2008 Horizon Hobby. All rights reserved.<BR>If you no longer wish to receive this newsletter, you may <A href="mailto:leave-322561-1056524.eb728df499487cb49c599c8dbafb4236@publications.horizonhobby.com"><B><FONT color=white><SPAN style="FONT-WEIGHT: bold; COLOR: white">unsubscribe</SPAN></FONT></B></A><BR>Please send any questions, comments, or concerns to <A href="mailto:webmaster@horizonhobby.com"><B><FONT color=white><SPAN style="FONT-WEIGHT: bold; COLOR: white">webmaster@spektrumrc.com</SPAN></FONT></B></A><BR><B><SPAN style="FONT-WEIGHT: bold">Mailing Address:</SPAN></B> Horizon Hobby, Inc., 4105 Fieldstone Rd., Champaign, IL 61822<BR>Spektrum is used with permission from Bachmann Industries, Inc.</SPAN></FONT></P></TD></TR></TBODY></TABLE>
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<P class=EC_MsoNormal><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Climb to the top of the charts! Play the word scramble challenge with star power. <A href="http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan" target=_blank>Play now!</A>_______________________________________________<BR>NSRCA-discussion mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</SPAN></FONT></P></BLOCKQUOTE>
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