[LASS Soaring] Really guys only 40 will be flying!
Edwin Wilson
ewilson1 at bellsouth.net
Sat Dec 29 10:49:29 EST 2007
Makes me wonder. I started out with 900Mhz phones in my house. Then I
went to 2.4Ghz and the signal was better but along came 5.8Ghz. The
sound was much improved and the range of the phone doubled or triple
what I had with 2.4. I also saw a new 8.? while shopping this
Christmas. Can we look forward to 5.8Ghz down the road? How about a
channel between the cell phone frequencies? There are gaps in the band
so different carriers can set them up for their own use.
Ed
Brian Kopke wrote:
> I think there is one point we are all overlooking here. Even though
> the 2.4GHz systems are limited to 40 "channels", this is 40 more 72MHz
> friendly channels than we have now. And it is not very likely the FCC
> is going to expand the RC band any time soon. Or ever.
>
> Now to get the 2.4 stuff to work in a full carbon fuse??.....
>
> Brian
>
>
> On Dec 27, 2007 8:51 AM, Ryan Woebkenberg <rdwoebke at hotmail.com
> <mailto:rdwoebke at hotmail.com>> wrote:
>
> Hey Brian,
>
> Do you ever make it out to the Ferdinand area much any more? If
> you ever do, we should try to fly sometime.
>
> Spektrum (currently the most popular 2.4 manufacturer) divides the
> 2.4 ghz bandwith into 80 1 mhz "channels". The Spektrum setup
> always grabs 2 channels and transmits on both, hence in theory
> there can be 40 Spektrum systems working concurrently. If the
> 41st system were to turn on or if there were other wireless
> devices (like wireless routers) using up bandwith, then the
> Spektrum system just "does not work" and it sort of scans waiting
> for something to become available.
>
> I really doubt there will be many times 40 systems will be on at
> once. The scenerio Gordy mentions of "Visalia practice day"
> certianly could be one of them, but at a regular contest, you
> would probably have at least 80 pilots to get into this situation,
> since normally guys time for each other and those guys then are
> not likely to be using their radio.
>
> Ryan
>
>
>
>
> ------------------------------------------------------------------------
> Date: Thu, 27 Dec 2007 07:55:08 -0500
> From: bkopke at gmail.com <mailto:bkopke at gmail.com>
> To: soaring at louisvillesoaring.org
> <mailto:soaring at louisvillesoaring.org>
> Subject: Re: [LASS Soaring] Really guys only 40 will be flying!
>
>
> Where did the magic number of 40 come from. Sorry if I
> overlooked it in a previous post.
>
> Brian
>
> On Dec 26, 2007 10:39 AM, David Gruneisen <
> david.gruneisen at gmail.com <mailto:david.gruneisen at gmail.com>>
> wrote:
>
> According to Spektrum (and JR) -
>
> "In the unlikely event that all channels are occupied, the
> next transmitter will scan the band indefinitely until
> open channels are available. The transmitter will then
> acquire the channel(s) and begin transmitting. Only then
> will the system connect."
>
> So the 10,000 TX handsets can all be on at once - only 40
> will find and acquire 2 discrete freqs, perform the
> necessary handshaking and actually transmit.
>
> Let's take my office environment as an example of multiple
> brands of 2.4 ghz existing in the same environment. There
> are approximately 60 devices from 4 different mfgers (IBM,
> Dell Nortel and Linksys a ll transmitting and receiving on
> the SAME frequency, using only packet collision detection
> to keep the individual receivers straight.
>
> I think JR and Futaba might do well to publish the FCC's
> 2.4g standards and their successful test completion
> documentation to help clear up these very reasonable
> questions about using this old technology in this new way.
>
>
> -David G
>
>
> On Dec 26, 2007 9:48 AM, <GordySoar at aol.com
> <mailto:GordySoar at aol.com>> wrote:
>
> Okay Ryan,
>
> What keeps the other 60 to 100 guys with various
> brands of 2.4 in their cars and pits from being on all
> at once? Impound?
> gordy
>
> In a message dated 12/26/2007 9:31:19 A.M. Eastern
> Standard Time, rdwoebke at hotmail.com
> <mailto:rdwoebke at hotmail.com> writes:
>
>
> I don't know about the rest of you all but I have
> seen the # of concurrent systems limitations in a
> lot of the litareture out there on the Spektrum
> and the Extreme.
>
> The way Spektrum works is if it can't grab the 2
> channels to opparate the receiver simply won't
> start "working". So, assuming we are all being
> good about doing our "wiggle checks" and if we are
> doing a good job of checking our "blinkies" as
> suggested by Don Richmond, should not be an issue
> there.
>
> http://www.spektrumrc.com/DSM/FAQ.aspx
>
> So far as our soaring goes, I think it is unlikely
> we will exceed the 40 "channels" at a soaring
> event. Take the Nats for example, there might be
> pilot groups of 10, so perhaps there could be 10
> guys turned on and waiting at the winch staging
> area, 10 guys launching and 10 guys in the air
> soon landing, but that still leaves 10 channels
> and perhaps a few guys "in the pits" might have
> radios on fiddling with trims/etc, but worst case
> one of the 10 guys that is turning on at the
> staging area just lets the "round master" know he
> can't get a free channel.
>
> Hope you all had a good Christmas. I got some
> servos to help complete Psyko #2.
>
> Ryan
>
>
>
>
> ------------------------------------------------------------------------
> From: GordySoar at aol.com <mailto:GordySoar at aol.com>
>
> Correct me if I am wrong but I believe the
> general modeler believed that with 2.4 all
> concerns for freq control were
> over....Millions could all be on at
> once...there was the story about the huge heli
> event with hundreds of attendees most enjoying
> the freedom of 2.4....hmmmn.
>
> Did you all believe that the amount of 2.4 TXs
> on at once was almost unlimited?
>
>
>
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