[LASS Soaring] 40 ish

[GordySoar at aol.com]

JR's website.
 
 
In a message dated 12/27/2007 7:55:48 A.M. Eastern Standard Time,  
bkopke at gmail.com writes:

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_ 
(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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