The 2.4 GHz band provides coverage at a longer range but transmits data at slower speeds. The 5 GHz band provides less coverage but transmits data at faster speeds. The range is lower in the 5 GHz band because higher frequencies cannot penetrate solid objects, such as walls and floors.
Home Made 2.4GHz Quarter Wave Wifi Antenna from old scrap found on the farm. 1/4 wavelength for this frequency is 31mm. It works great too. Recycling can be.
24ghz Feed
If you've got, or you've been thinking of buying, a 2.4GHz spread-spectrum RC set then you'll probably be keen to understand exactly how it works, and hopefully this article will help you do so.
First, a few words about older 'narrowband' RC systems...
2 4 Ghz Free Fire
The 2.4 GHz band, which runs from about 2,400 to 2,483.5 Mhz, is where routers have to live. For this, they can thank the microwave. Microwave ovens heat food by blasting it with, literally.
Traditional narrow-band RC systems on anywhere from 27MHz to 72MHz are fairly easy to understand because they work just like your regular AM or FM radio - sending out a signal that is picked up by the receiver and then sent to the servos.
Unfortunately, just like regular FM broadcast radio, these RC systems require a frequency all to themselves if they're going to avoid interference with each other. What's more, it doesn't take much to disrupt a regular narrow-band signal. A noisy thermostat or electric drill can often cause massive amounts of electrical interference when listening to an AM broadcast and FM isn't always that much better.
2 4 Ghz Freeway
But manufacturers of spread spectrum (SS) radio systems are claiming that you need never worry about being shot down by other fliers and that all 2.4GHz systems can get along in harmony, despite apparently using the same frequencies.
So how can that work?
2 4 Ghz Freezer
Well to explain this, I'm going to use a series of illustrations that I call 'the freeway analogy'. Using these diagrams and explanations, I will do my best to convey the complex world of spread spectrum in a form that most people can get their brains around. Of course in doing this I've had to take a few liberties with the details but these are not important.