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<DIV><FONT face=Arial color=#0000ff size=2>I thought many wireless devices were
using the 2.4 GHz in homes and computer stuff. ? </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2> </FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2> Del</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=rbearden56@bellsouth.net
href="mailto:rbearden56@bellsouth.net">Randall Bearden</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, March 02, 2008 9:13
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Speaking
of 2.4GHz</DIV>
<DIV><BR></DIV><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px">On 3/1/08 1:49 AM, "John Pavlick" <<A
href="mailto:jpavlick@idseng.com">jpavlick@idseng.com</A>>
wrote:<BR><BR></SPAN></FONT>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT face=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.<BR></FONT><FONT
face="Verdana, Helvetica, Arial"><BR></FONT><FONT face=Arial>John
Pavlick<BR><A
href="http://www.idseng.com">http://www.idseng.com</A><BR></FONT><FONT
face="Verdana, Helvetica, Arial"><BR><B>From:</B> Ed Alt <A
href="mailto:ed_alt@hotmail.com"><mailto:ed_alt@hotmail.com></A>
<BR></FONT></SPAN>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face="Verdana, Helvetica, Arial"><BR><B>To:</B> NSRCA Mailing List <A
href="mailto:nsrca-discussion@lists.nsrca.org"><mailto:nsrca-discussion@lists.nsrca.org></A>
<BR> <BR><B>Sent:</B> Saturday, March 01, 2008 12:15
AM<BR> <BR><B>Subject:</B> Re: [NSRCA-discussion] Speaking
of 2.4GHz<BR> <BR><BR>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<BR> <BR>
<HR align=center width="100%" SIZE=3>
<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>Ed Alt
<ed_alt@hotmail.com></I></B> wrote:
<BR> <BR></FONT></SPAN>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face="Verdana, Helvetica, Arial"><BR></FONT></SPAN>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><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> <BR>Ed<BR><BR><BR> <BR></FONT></SPAN>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face="Verdana, Helvetica, Arial"><BR>
<HR align=center width="100%" SIZE=3>
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><A
href="http://www.xtremepowersystems.net/">http://www.xtremepowersystems.net/</A><BR><BR>Ed<BR><BR><B><I>Ken
Thompson <kthompson@stx.rr.com></I></B> wrote:
<BR></FONT></SPAN>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face="Verdana, Helvetica, Arial"><BR></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></FONT><FONT
face="Verdana, Helvetica, Arial"><BR></FONT></SPAN>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT
face="Verdana, Helvetica, Arial"><BR>----- Original Message
----- <BR> <BR><B>From:</B> Kevin Brice <A
href="mailto:kevinbrice@earthlink.net"><mailto:kevinbrice@earthlink.net></A>
<BR> <BR><B>To:</B> nsrca-discussion@lists.nsrca.org
<BR> <BR><B>Sent:</B> Thursday, February 28,
2008 11:25 AM<BR> <BR><B>Subject:</B>
[NSRCA-discussion] The Great 2.4GHz DSM
Giveaway<BR> <BR><BR> <BR> <BR></FONT></SPAN><FONT
face="Verdana, Helvetica, Arial"><FONT color=#000080><FONT
size=4><SPAN style="FONT-SIZE: 13px">For those on the 2.4
fence, this may encourage you to upgrade to
DSM.<BR></SPAN></FONT></FONT><SPAN
style="FONT-SIZE: 12px"><BR> <BR> <BR></SPAN><FONT
color=#000080><FONT size=4><SPAN style="FONT-SIZE: 13px">I am
not sure if the html graphics will show so here is the
link to Spektrum’s Receiver Giveaway.
<BR></SPAN></FONT></FONT><SPAN
style="FONT-SIZE: 12px"><BR></SPAN><FONT color=#000080><FONT
size=4><SPAN style="FONT-SIZE: 13px"><A
href="http://www.spektrumrc.com/giveaway/">http://www.spektrumrc.com/giveaway/</A>
<BR></SPAN></FONT></FONT><SPAN
style="FONT-SIZE: 12px"><BR> <BR> <BR> <BR><FONT
color=#000080>Kevin Brice<BR></FONT><BR><FONT
color=#000080>kevinbrice@earthlink.net
<BR></FONT><BR> <BR> <BR> </SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"><BR>
<HR align=center width="100%" SIZE=2>
</SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"><BR></SPAN><FONT size=4><SPAN
style="FONT-SIZE: 13px"><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></SPAN></FONT><SPAN
style="FONT-SIZE: 12px"><BR> <BR> </SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px">Having trouble viewing this email? Click
here. <A
href="http://publications.horizonhobby.com/read/archive?id=1223&e=kevin@wenzlerarchitects.com&x=99e8f192"><http://publications.horizonhobby.com/read/archive?id=1223&amp;e=kevin@wenzlerarchitects.com&amp;x=99e8f192></A>
</SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"> <BR>
</SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"> </SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"><BR> </SPAN></FONT>
<P align=right><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"> </SPAN><FONT size=2><SPAN
style="FONT-SIZE: 10px"><B>February 28, 2008
</B></SPAN></FONT></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"><BR> <BR> <BR>
</SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"> </SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"> </SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"></SPAN></FONT>
<P><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"> </SPAN></FONT>
<P align=center><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px"><BR> </SPAN><FONT
size=2><SPAN style="FONT-SIZE: 10px">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></SPAN></FONT><SPAN
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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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