[NSRCA-discussion] Speaking of 2.4GHz

Sun Mar 2 05:13:23 AKST 2008

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>
>>  
>> 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 Brice <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
>>>>>>> Spektrum¹s 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&amp;e=kevin@w
>>>>>>> enzlerarchitects.com&amp;x=99e8f192>
>>>>>>>  
>>>>>>>    
>>>>>>>      
>>>>>>>   
>>>>>>>  
>>>>>>>  
>>>>>>>  
>>>>>>>    
>>>>>>>   February  28, 2008
>>>>>>>  
>>>>>>>  
>>>>>>>  
>>>>>>>    
>>>>>>>     
>>>>>>>     
>>>>>>>   
>>>>>>>  
>>>>>>>   
>>>>>>>  
>>>>>>>   
>>>>>>>  
>>>>>>>   PLEASE  VISIT WWW.SPEKTRUMRC.COM/GIVEAWAY
>>>>>>> <http://publications.horizonhobby.com/t/322561/1056524/7046/0/>   FOR
>>>>>>> MORE INFORMATION
>>>>>>>  
>>>>>>>   Copyright  © 2008 Horizon Hobby. All rights reserved.
>>>>>>> If  you no longer wish to receive this newsletter,  you may unsubscribe
>>>>>>> <mailto:leave-322561-1056524.eb728df499487cb49c599c8dbafb4236 at publicatio
>>>>>>> ns.horizonhobby.com>
>>>>>>> Please  send any questions, comments, or concerns to
>>>>>>> webmaster at spektrumrc.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.
>>>>>>>  
>>>>>>>  
>>>>>>>  
>>>>>>> 
>>>>>>>  
>>>>>>>  
>>>>>>>  
>>>>>>>  
>>>>>>> 
>>>>>>>  
>>>>>>> _______________________________________________
>>>>>>> NSRCA-discussion  mailing  list
>>>>>>> NSRCA-discussion at lists.nsrca.org
>>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>>> _______________________________________________
>>>>>> NSRCA-discussion  mailing  list
>>>>>> NSRCA-discussion at lists.nsrca.org
>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>>>> 
>>>> 
>>>>  
>>>> 
>>>>  Climb to the top of the charts! Play the word scramble challenge with
>>>> star power. Play  now!
>>>> <http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan
>>>> > _______________________________________________
>>>> NSRCA-discussion  mailing  list
>>>> NSRCA-discussion at lists.nsrca.org
>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>>> 
>> 
>>  
>> 
>>  I am curious what ³noise² 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 analyzer¹s 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 doesn¹t lend
>> itself to the idea of house noise causing interference.  Also, unless you can
>> narrow the display bandwidth way down then you won¹t see any frequency
>> ³hopping².  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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>> NSRCA-discussion at lists.nsrca.org
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> 
> 
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