Interference and 2.4GHZ
For the purpose of this thread I am going to make an outrageous statement
It is impossible for the ignition of a gas motor to interfere with 2.4 GHZ system.
I know a lot of you don't believe that but it's true. Well maybe not completely impossible but it is so close to impossible that it can be considered impossible.
I am going to make two points..
First consider the way to spread spectrum system works.
In the transmitter or receiver there is a mathematical formula to develop what is called a pseudorandom number. It is pseudorandom number because a computer cannot produce a true random number:
during the binding process the number is transferred to the other device, receiver or transmitter depending on where it has been generated.
This number,now called the code, is used by the transmitter to determine what frequency to transmit on. The Receiver looks to see if the series of frequencies agrees with the code that the two devices agreed to use during a binding process. If it does not agree the receiver rejects the message. That is why your friend transmitting on exact same frequencies does not interfere with you. His receiver is looking for different code.
Now I ask you a question. If your friend, transmitting a on the same exact frequencies, does not interfere with you why would you expect the ignition noise that is completely random to interfere with your system?
My next point:
It is said that the ignition spark contains all of the frequencies in the spectrum. True. It contains all of frequencies from zero to above the frequency of light. So why doesn't it completely wipe out the band and completely block your system? Well perhaps it does. But consider this:
A motor running at say 6000 RPM produces a spark every 10 ms. But that spark only lasts for less than 1 ms. That leaves 9 ms for the transmitter to send the data to the receiver. 9 ms is a very very long time considering the electronics we have today, and the bandwidth available on 2.4. So the band gets wiped out one 1ms out of 10 ms. The receiver would just reject the noise and continue to get updated nine times out of 10 ms. With the bandwidth available on 2.4 you could easily update all the channels in 1 ms.
You are still not convinced?
Try this:
Remove the spark plug from your engine. Remove propeller and spinner.
Insert the spark plug in your high tension lead.
Install the spinner on your engin without the propeller, turn on the ignition, and the receiver and transmitter, and use the starter to spin the engine. Have someone else operate the controls and hold the sparking plug as close to the receiver antenna as you can.
You will find that your system will operate normally.
If you have a situation that looks like an RF problem, its not. You had better find what the cause truly is, or it would likely come back and bite you later.