[NSRCA-discussion] Speaking of 2.4GHz

Sat Mar 1 10:21:48 AKST 2008

Hello everyone!

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
http://www.maxstream.net/.   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.  

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.

My $0.02 .

Tim

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Pavlick
Sent: Friday, February 29, 2008 11:49 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Speaking of 2.4GHz

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>  

To: NSRCA Mailing List <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 <mailto:kevinbrice at earthlink.net>  Brice 

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] 
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://ns.horizonhobby.com/nscontent/Brand/SPM/Images/spm-header.gif> 

February 28, 2008

<http://ns.horizonhobby.com/nscontent/Brand/SPM/2008.02/Images/giveawayHeade
r600.jpg> 

<http://ns.horizonhobby.com/nscontent/Brand/SPM/2008.02/Images/changeHeader.
jpg> 

<http://ns.horizonhobby.com/nscontent/Brand/SPM/2008.02/Images/giveawayRadio
s600.jpg> 

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

Copyright C 2008 Horizon Hobby. All rights reserved.
If you no longer wish to receive this newsletter, you may
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Please send any questions, comments, or concerns to
<mailto:webmaster at horizonhobby.com> webmaster at spektrumrc.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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