[NSRCA-discussion] More info on the Spektrum and 2.4 Ghz use

[Jerry Budd]

Hi Jay,

The system being discussed doesn't "channel hop", it automatically 
selects an open channel and then stays there until the system is 
powered down/up again.  It's not really a true spread spectrum system.

Thx, Jerry

>One watt is true but not necessarily of importance. The Apollo 
>transmitters were also at 2.4 GHz, low power, and went to the moon! 
>(I was tracking them) The important things for the Spektrum are the 
>dual frequencies and spread spectrum modulation. It is important to 
>understand the latter. Imagine a football player standing in one 
>place. That is your standard R/C system - easy to hit. Spread 
>spectrum, however, is dodging all over the place but in a controlled 
>sequence of maneuvers. Even if you knew which of the many different 
>sequences it could take it still would not be in one place long 
>enough to hit. Despite this, if there was an interfering signal you 
>wouldn't be at that location long enough to do any damage. The 
>technology challenge is to get the range out far enough for the big 
>birds - don't worry about interference.
>
>
>-----Original Message-----
>From: nsrca-discussion-bounces at lists.nsrca.org 
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ed Alt
>Sent: Saturday, December 31, 2005 3:29 PM
>To: discussion at nsrca.org
>Subject: [NSRCA-discussion] More info on the Spektrum and 2.4 Ghz use
>
>Someone posted yesterday with concerns about the 2.4 Ghz band by 
>high power industrial and/or municipal use being a growing threat. 
>After doing some initial browsing, I found the following website 
>with more info about this.  I plan to look into the actual FCC rules 
>to see for myself, but this seems to indicate that it's a needless 
>concern to worry about other users coming on line in the 2.4 Ghz 
>band and swamping out the 79 available channels.  According to this, 
>all devices in this band are limited to 1 watt transmitted power. 
>If this info is accurate, no real worries that I can see.
>
><http://www.spektrumrc.com/Articles/Article.aspx?ArticleID=1535>http://www.spektrumrc.com/Articles/Article.aspx?ArticleID=1535
>
>Ed
>
>
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-- 
___________
Jerry Budd
Budd Engineering
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