[NSRCA-discussion] Speaking of 2.4GHz
Mark Atwood
atwoodm at paragon-inc.com
Sun Mar 2 09:53:36 AKST 2008
Pretty much all of your standard wireless routers use 2.4ghz. 802.11b and
802.11g (virtually all of the wireless traffic) is 2.4ghz as are bluetooth
devices. Bluetooth uses FHSS though where 802.11b/g use direct sequencing
(DSSS) I believe...could be wrong on that last part, but I know they all use
2.4ghz.
-M
On 3/2/08 1:23 PM, "Del Rykert" <drykert2 at rochester.rr.com> wrote:
> I thought many wireless devices were using the 2.4 GHz in homes and computer
> stuff. ?
>
> Del
>>
>> ----- Original Message -----
>>
>> From: Randall Bearden <mailto:rbearden56 at bellsouth.net>
>>
>> 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>
>>>
>>>>
>>>> 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&e=kevin@wenzl
>>> erarchitects.com&x=99e8f192>
>>> <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 publications.h
>>> orizonhobby.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.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>>>
>>>
>>> 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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