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

[David Gruneisen]

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> 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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