Calling Spektrum's DSM System 'revolutionary' just doesn't say it. It is nothing less than a quantum leap in RC technology that will change forever how you communicate with your car or truck. 
| "I've never had a bump. So solid. Rock solid. No twitches. I didn't realize that I'd come to accept "hits."
- Horizon Engineering Manager, John Adams |
ULTRA HIGH FREQUENCY ADVANTAGEThe Spectrum DSM system operates in the ultra high 2.4GHz ISM (Industry, Science and Medical) band. This ultra high frequency offers several advantages over conventional 27 and 75MHz systems. First, all model-generated radio interference from noisy motors, speed controllers, bad bearings, metal-to-metal noise, etc. exists below 300MHz. At 2.4GHz (that’s 2400MHz) the operational frequency range of the Spectrum system is 8 times higher than the range of this model-generated RF noise, making the system immune to these types of interference. Secondly, 2.4GHz is an internationally accepted band, so it’s not necessary to change radio equipment when traveling to overseas events.And because the 2.4GHz wavelength is very short, the required lengths of the antennas are much shorter. The receiver antenna is 8.5” and can be cut down to 3.6” if desired, making antenna mounting within the body easy. The transmitter antenna is a mere 3.5” long, eliminating the “fishing rod” that normally extends into view. FCC learned valuable lessons from other bands and applied those lessons to the 2.4GHz band. And unlike the 27 and 75MHz band, the FCC limits the power output in this 2.4GHz to a maximum of 1watt, thus preventing other 2.4GHz systems from overpowering each other. In other words, there are no “high power” commercial users interspersed in the 2.4 GHz band. THE BENEFITS OF DSMSpektrum’s DSM system eliminates all types of radio interference, including model-generated noise from motors, ESCs, bad bearings, etc. and from outside sources like pagers, cell phones, wireless computer systems and other RC radio systems, and offers these benefits: No more waiting for an open frequency—just turn it on Ultra fast 5.6ms response time No tuning or maintenance to perform (ever) Built-in fail-safe drives servos to preprogrammed position if signal is lost Ultra precise 4096 bit resolution Operates on international 2.4GHz ISM band so no need to change bands when traveling to international races Short 8.5” or 3.6” receiver antenna length and 3.5” transmitter antenna length 40% less current draw with the transmitter means 40% more battery life Telemetry ready for rpm/speed, temperature, battery voltage, lap times and signal strength Legal for most racing organizations including ROAR, NORRCA and IFMAR Available for most popular 3-channel module radio systems for easy, inexpensive conversion to DSM technology
HOW DSM WORKSCollision avoidance eliminates the possibility of more than one Direct Sequencing Spread Spectrum system from transmitting on the same frequency. Here’s how it works: When the transmitter is turned on, the system scans the 2.4GHz band looking for an open channel. 79 channels are available. When an open channel is found, the system locks in and transmits on that channel as seen below. This process takes about 2 seconds. In the unlikely event an open channel is unavailable, the transmitter continues to scan without emitting a signal until an open channel becomes available. The transmitter will remain on that selected channel until it’s turned off. Each individual module is factory programmed with its own unique serial code called GUID (Globally Unique Identification code). Once a receiver is programmed to a specific module (called binding) the receiver will only recognize that module ignoring signals from any other sources. And with over 4 billion possible GUID codes, it’s virtually impossible for a receiver to listen to anything other than its bound transmitter. When the receiver is turned on, it scans the 2.4GHz band and searches for its specific transmitter’s encoded signal. When found, it locks in on that channel. If the signal is lost, the receiver goes into a hold mode, positioning the servo to a preset fail-safe position until the signal is reacquired. If the receiver is turned on before the transmitter, it will continuously scan the band until the encoded transmitter signal is present. During this period, the receiver drives the servos to the preset fail-safe position. All Direct Sequencing Spread Spectrum systems are required by the FCC to incorporate active collision avoidance, making it impossible and illegal for more than one transmission on a single frequency.
| "Convenience is tremendous. Anywhere, anytime, any place. You can check your car for maintenance without getting the pin."
- Horizon Engineering Manager, John Adams |
BINDING
Each module has it own unique code (called GUID). The receiver must be programmed to a specific module so that the receiver will only recognize that module, ignoring signals from any other sources. This process called binding is push-button-easy and takes only about 30 seconds. During the binding process the servo fail-safe positions are also set. It’s necessary to bind the receiver to the module during first installation and is recommended when the receiver is moved from one car to another. Multiple receivers can be bound to a single transmitter module, common when using one transmitter to operate several models. BOTTOM LINEWith Spektrum’s DSM system, you no longer have to wait for the frequency clip to practice, worry about transmitters being turned-on on your frequency, or interference caused from noisy motors, speed controllers or other interfering sources. The receiver will only recognize its corresponding module and it’s virtually impossible for a receiver to listen to anything else! Plus the DSM system is telemetry-ready, and with optional telemetry modules the engine temperature, speed, rpm, signal strength, battery voltage and even lap times are displayed in real time via Spektrum’s handheld display or via a PC. If you own any of the popular 3-channel module systems, the Spektrum module quickly replaces the existing module in your transmitter converting to this bulletproof radio link. |
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