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Quote: Originally Posted by NormS |
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Because of the different pseudorandom sequences in different transmitters, two or more DSSS systems can actually use the same channel at the same time with no interference (this is how CDMA cell phones work) but I don’t think Spektrum makes an attempt to do this because they seem to have a limit of 40 systems at a time. |
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This is off Spektrum's FAQ: (
http://spektrumrc.com/DSM/FAQ.aspx)
What happens if two transmitters are on the same frequency?
To be FCC legal, all 2.4Ghz devices must incorporate a collision avoidance system that prevents the system from transmitting on an already occupied frequency. The chance of two transmitters occupying the same frequency is highly unlikely. If two transmitters should somehow end up on the same frequency, other safeguards, such as the GUID and proprietary time base coding, will prevent interference. Of course, with the aircraft system, the transmitter is transmitting on two frequencies simultaneously. The odds of two transmitters transmitting on the same two frequencies is even, more unlikely but again, should this happen, other safe guards will prevent interference.
It seems Spektrum systems
will work when operating on the same frequencies (be it Spektrum or other) as other devices. It appears they have the 40 systems limit due to FCC requirements.