[NSRCA-discussion] Speaking of 2.4GHz

Sun Mar 2 10:20:53 AKST 2008

They are - including your microwave. The Apollo program also used this
frequency band.

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Del Rykert
Sent: Sunday, March 02, 2008 1:23 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Speaking of 2.4GHz

I thought many wireless devices were using the 2.4 GHz in homes and computer
stuff. ?  

    Del

----- Original Message ----- 

From: Randall <mailto:rbearden56 at bellsouth.net>  Bearden 

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Sunday, March 02, 2008 9:13 AM

Subject: Re: [NSRCA-discussion] Speaking of 2.4GHz

On 3/1/08 1:49 AM, "John Pavlick" <jpavlick at idseng.com> wrote:

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.

John Pavlick
http://www.idseng.com

From: Ed Alt  <mailto:ed_alt at hotmail.com> <mailto:ed_alt at hotmail.com>  

To: NSRCA Mailing List  <mailto:nsrca-discussion at lists.nsrca.org>
<mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Saturday, March 01, 2008 12:15  AM

Subject: Re: [NSRCA-discussion] Speaking  of 2.4GHz

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.  

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.  

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.

Ed

  _____  

Date: Fri, 29 Feb 2008 14:17:06 -0800
From:  edvwhite at sbcglobal.net
To: nsrca-discussion at lists.nsrca.org
Subject: Re:  [NSRCA-discussion] Speaking of 2.4GHz

Ed,

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).  

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.

Ed

Ed Alt <ed_alt at hotmail.com> wrote:  

 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.  

Ed

  _____  

Date: Fri, 29 Feb 2008 08:44:14 -0800
From:  edvwhite at sbcglobal.net
To:  nsrca-discussion at lists.nsrca.org
Subject: [NSRCA-discussion] Speaking  of 2.4GHz

Anybody have experience with the xtremelink  systems?

http://www.xtremepowersystems.net/

Ed

Ken  Thompson <kthompson at stx.rr.com> wrote:  

That's pretty cool, thanks for  bringing this to the list.  I saw this in
the Flying Giants first  thing this morning.

----- Original Message ----- 

From:  Kevin Brice  <mailto:kevinbrice at earthlink.net>
<mailto:kevinbrice at earthlink.net>  

To: nsrca-discussion at lists.nsrca.org  

Sent: Thursday, February 28,  2008 11:25 AM

Subject: [NSRCA-discussion] The  Great 2.4GHz DSM Giveaway

For those  on the 2.4 fence, this may encourage you to upgrade to  DSM.

I am not  sure if the html graphics will show so here is the link to
Spektrum's Receiver Giveaway. 

http://www.spektrumrc.com/giveaway/ 

Kevin Brice

kevinbrice at earthlink.net  

  _____  

From: Spektrum Signal  [mailto:webmaster at spektrumrc.com]
<mailto:webmaster at spektrumrc.com%5d>  
Sent: Thursday,  February 28, 2008 10:00 AM
To: kevin at wenzlerarchitects.com
Subject:  The Great 2.4GHz DSM Giveaway

Having trouble viewing this email? Click  here.
<http://publications.horizonhobby.com/read/archive?id=1223&e=kevin@wenzlerar
chitects.com&x=99e8f192>
<http://publications.horizonhobby.com/read/archive?id=1223&amp;e=kevin@wenzl
erarchitects.com&amp;x=99e8f192> 

 February  28, 2008 

  PLEASE  VISIT WWW.SPEKTRUMRC.COM/GIVEAWAY
<http://publications.horizonhobby.com/t/322561/1056524/7046/0/>
<http://publications.horizonhobby.com/t/322561/1056524/7046/0/>   FOR MORE
INFORMATION

  Copyright  C 2008 Horizon Hobby. All rights reserved.
If  you no longer wish to receive this newsletter,  you may unsubscribe
<mailto:leave-322561-1056524.eb728df499487cb49c599c8dbafb4236 at publications.h
orizonhobby.com>
<mailto:leave-322561-1056524.eb728df499487cb49c599c8dbafb4236 at publications.h
orizonhobby.com> 
Please  send any questions, comments, or concerns to
webmaster at spektrumrc.com  <mailto:webmaster at horizonhobby.com>
<mailto:webmaster at horizonhobby.com> 
Mailing  Address: Horizon Hobby, Inc., 4105  Fieldstone Rd., Champaign, IL
61822
Spektrum  is used with permission from Bachmann  Industries,  Inc.

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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. 

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