[LASS Soaring] Really guys only 40 will be flying!

Sat Dec 29 10:09:36 EST 2007

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> 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
> To: 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>
> 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 2.4ghz 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> 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 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
>
> 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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