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RC Helicopter Spread Spectrum Radios |
| Date Added: August 26, 2008 07:55:02 PM |
| Author: RC Price Watch |
| Category: 08. Radios and Receivers |
| Unlike conventional PPM (pulse position modulation) and PCM (pulse code modulation) radio systems which operate on distinct channels, spread spectrum radios broadcast over a large range of channels simultaniously. These channels are all members of the 2.4 Ghz band, which removes them from the frequencies often used by other radio devices. Because of this, spread spectrum radio systems are not affected by the interference caused by non RC radio systems. Spread Spectrum technology also eliminates the need for frequency control. Spread spectrum radio systems broadcast over a multitude of radio frequencies, and the user is never aware of what they are. This works because: 1. The transmitter is assigned a unique identification code when it is built. 2. The radio receiver is programmed to seek and lock to this same code. After the transmitter is turned on, it encodes the signals it sends with its identification code. 3. The receiver searches for this code, and locks to the frequencies that the transmitter is operating on. Each identification code is unique, which means that no other radio system in the world uses it. Because of this, the individual frequencies that the radio is operating on are irrelevant, so many spread spectrum radios can operate simultaneously. The most noticeable consequence of this technology is that spread spectrum radios are immune to radio interference. Spread spectrum radios also allow an extremely fast servo response time, because the entire encoding, decoding, and execution of radio commands happens in milliseconds. Spread spectrum technology is becoming more prevelant in RC radio systems, and will shortly replace conventional FM radio systems entirely. |
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