2.4 interference
I found this on the ad for a Futaba trensmitter
Why is Futaba’s 2.4GHz system better?
Channel Shifting - This means that interference is virtually impossible. Futaba’s system only occupies each individual frequency for 2 milliseconds.
Stronger, More Robust Link - Futaba’s system doesn’t need redundant receivers. Instead, it uses a combination of Channel Shifting and Dual Antenna Diversity (DAD) to provide a robust, highly dependable link between the transmitter and receiver.
Pre-Vision Packet Screening Technology - This looks ahead for potential problems when scanning incoming data and applies sophisticated error correction techniques resulting in a system that gives the user a solid, impenetrable connection with their model.
Custom Developed Technology - Futaba uses custom IC chips that have been designed specifically for radio control.
So how does the receiver know what transmitter to link to?
Each transmitter has a unique ID code that after linking with the 2.4GHz receiver, assures this receiver will only follow commands from this transmitter. Set it and forget it! Just push the recessed button on the receiver and it will never forget the unique transmitter ID code, which locks the receiver to the transmitter. With over 134 million possible codes, there’s no chance for a conflict.
Note that they say interference is virtually impossible.
If you have an ax to grind go grind it with Futaba. I am not going to respond.