AR7000—Spectacular Signal Clarity:
The AR7000 dual receiver that comes with the DX7 is key to the system’s incredibly robust RF link. Comprised of a compact main receiver that is linked to an even smaller satellite receiver by a 6” lead, the AR7000 acts as a pair of extremely sharp RF “eyes” that each take in a slightly different view of the signal environment. Information from both receivers is then processed by patent-pending Spektrum software that takes information from each receiver and combines it to form the most vivid “picture” of an RF signal than has ever been possible before. What’s more, there are no long antennas to accommodate. The AR7000’s short 3” antennas don’t require any external exposure, so installation is an absolute breeze.

THE SERVOS:
The four DS821 servos that come with the DX7 put out an impressive 72 oz/in of torque that is suitable for a wide range of electric, gas or glow aircraft. Their digitally precise output is further enhanced by a robust, high-tech resin gear train that is exceptionally durable for reliable performance flight after flight.

Completely Immune to Environmental and Model Interference
Up to this time, conventional ground radios have been operating on either the 27 MHz or the 75MHz narrow band systems. These bands are

• On a single channel
• They are a very narrow band channels - only 20 KHz apart, and are extremely vulnerable to many causes of radio interference

These causes of interference come from some one else on the same channel - like

• Another modeler on the same frequency
• The FCC allows High Power 72 MHz users to transmit on channels that are in between our RC channels. Some local businesses have been know to transmit up to 50,000 KHz on these in between channels, giving off a lot of interference to RC and in some cases have even shut down the use of certain frequencies as some clubs due to know interference issues.

• Noisy sail winches motors
• Metal on metal, such as rudder post passing thru hull
• Metal Sidestays, mast, boom, boom vangs binding and twisting when maneuvering the sails

And the 3rd type of interference on the 27 and 75MGz band is 3im and 2im issues. This is when 2 or 3 other modelers are on frequencies that create a harmonic witch then creates interference on yet another channel.

However, Spread Spektrum has eliminated all these issues. The DX7 Spread Spektrum system is a DuaLink system that operates in the ultra high 2.4GHz band. This ultra high frequency offers several advantages over conventional 27 and 75MHz systems. First, all RF interference only 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, unlike the 27 and 75MHz band, the FCC limits the power output in this 2.4GHz to a maximum of 1watt. So, consequently no “high power” commercial users interspersed in the 2.4 GHz band.

Third, the FCC also Mandates a function called Collision Avoidance on the 2.4GHz band - meaning anything turned on in the 2.4 range must be cognitive or aware of other things in that band. So, when the DX7 is turned on, the first thing it does is scan all 80 channels looking for a open channel to choose. Once it finds one it then locks on and then turns on the transmitter. After it does that, because the DX7 is a DuaLink system, it then searches for a second open frequency, locks into that one and then transmits on this second frequency also. Thus, DuaLink means 2 transmitters and 2 receivers and it actually transmits and receives on 2 frequencies simultaneously. Collision Avoidance prevents a system from coming on a frequency already taken and prohibits other systems from coming on and interfering

• WIFI
• Wireless routers
• Cordless phones

Anything on the 2.4 GHz band must have "Collision Avoidance".

Spektrum's "GUID"
• Each DX7 has a chip that has it's own GUID, Globally Unique Identifier. This GUID or secret code has so many digits that it is possible to have over 4.2 Billion different combinations.

• The transmitter comes from the factory with its own unique GUID pre assigned. All receivers that want to communicate with this transmitter will first have to be taught the transmitter's GUID by a process called binding. Once a receiver is bound to a particular transmitter, that receiver will only take commands from that transmitter and nothing else.
• You can bind an unlimited number of receivers to a single transmitter
• And you can bind a receiver as many times as you want
• The DX7 is sold with the receiver already bound to the transmitter - so one really only needs to bind addition receivers

No Frequency Overlaps or Crystals
• Here's the best part... no more changing crystals... no worrying about someone else on your channel.
• Simply turn the DX7 on and it scans for 2 available frequencies, then set the TX and RX. You can arrive late and even with a race going on, turn on the system, and it will not interfere with those racing... but it will set itself and your ready to go.

Excellent Range
The AR7000 Dual Receiver is capable of providing outstanding signal reception beyond visual range, so you can rest assured you have locked-in, precise control no matter how fast you fly.

No more Interference
• The Spektrum's DX7 system utilizes patent-pending DuaLink ™ technology to create a secure, reliable, robust 2.4GHz spread spectrum link!
• Because the signal is pure digital, it means that glitches are a thing of the past too. No more annoying glitches that shatter the confidence and cause you to worry about crashing. They're a thing of the past too.
Not to mention the nasty intermodulation issues that have plagued 27, 72 and 75 MHz like 2IM, 3IM and adjacent frequency. They too, can't affect DSM.

Computer Radio
The Spektrum DX7 has all sorts of great computer features for RC Boats. Click here for AMYA DX6 Boat Article

• Digital DSM2™ Spread Spectrum Modulation
• 20-Model Memory - you can switch between boats and not mess up any of your setting.
• Airplane and Heli software
• Set the servo travel - excellent for setting the sail winch travel
• Switch assignment
• Dual Rates - flip a switch and rudder is 40% less sensitive for downwind steering
• P-mixes
• Exponential Rates on aileron and elevator - rudder is less sensitive near center, but increase throw as you move the stick to the outside.
• Dual/Exponential Rates can be combined on one switch
• Trainer System compatible with Spektrum™ and JR® radio systems
• Adjustable Stick Length
• Throttle Trim affects low position only
• Two-Speed Scrolling
• Throttle-Smart Fail-Safe System
• Digital Trims for precise adjustment - with audible clicks and higher tone at center
• Includes 4 powerful DS821 digital servos with high-tech resin gears
• 3-axis dual rate & expo
• 3-position flap (Airplane)
• 5-point throttle curve (Heli)
• 3 flight modes plus hold (Heli)
• Gyro programming (Heli)
• CCPM, 2-servo 90°, 3-servo 90°, & 3-servo 120°
• DX7 TRANSMITTER
• 7 Channel
• 20 model memory
• Aircraft and Heli programming
• 2.4 GHz DSM2 Full Spektrum System
• Fully Digital trims
• 1500 NiMh battery