Receiver Schulze alpha-8.40sW
with vertical servo socket pins and splash water protection

With vertical servo socket pins and splash water protection

The schulze-alpha receiver can be considered to be the most reliable RX worldwide.

The schulze-alpha 8.40sW is an ultra-compact, lightweight radio control 8-channel receiver designed specifically to satisfy the increasingly stringent demands of modellers concentrating on electric-powered models.

AND this receiver can take water!*

alpha receivers can be used without any restrictions in RC boats, cars or model submarines.

Features in detail:
The asc (automatic signal strength control - automatic damping of received signal with high amplitudes) ensures optimum close-range and long-range reception. The receiver automatically reduces the signal strength of powerful received signals, thereby avoiding the risk of overloading the aerial input stage, which always has unwanted side-effects (interferences).

Reliable operation when adjacent channels are in use is a fundamental requirement as far as we are concerned.
For this reason we employ narrow-band filters which provide safe operation using the standard 10 kHz channel spacing.

When a receiver is operated close to its range limit it is particularly vulnerable to interference.

For instance:
The servos start to jitter: under certain circumstances they may run against their mechanical stops and overload the receiver power supply; if the model is electric-powered, the motor may burst into life and make the interference even worse - which of us has not experienced that at launch or on the landing approach when the receiver aerial is poorly positioned?
A crash is simply inevitable.

At the development stage we also placed considerable importance on the apdr digital post-processing applied to the received signal for this very reason.

Our techniques allow the receiver to detect interference, suppress it, and replace the invalid signal by previously received valid values (s&h - sample and hold - similar to PCM techniques). The signals passed to the servos always lies within normal limits, and the servos are usually able to process them without problem.

If interference persists, the receiver switches off the servo signals completely. Under certain circumstances the servos may then be moved back towards neutral by aero- or hydro-dynamic pressure.

apdr technology goes one stage further: it can generate (r = restoration) either the actual transmitted signal (suppressing a glitch caused, say, by an electric motor) or a signal close to the original signal. This it does by analysing the interference contained in the received signal.

atss makes that every time you switch on the system the receiver counts the channel signals in order to ensure that a receiver signal with the incorrect number of channels is not passed to the servos. (The channel-check is permanent in the receivers.)

If a PCM transmitter on the same RF channel is switched on, it will not cause the servos connected to an alpha receiver to jitter - thanks to atss.
atss also switches automatically between positive and negative shift (US-transmitters), normal PPM modulation mode and Futaba TX synthesizer modulation mode.

CAUTION: all this sophistication is no guarantee for problem-free operation. If you drive or fly close to the range limit, or even at close range if the aerial is poorly positioned, a problem may arise which the receiver automatically corrects, leaving you unaware that there ever was a problem.

That is why we have also installed a reception quality indicator LED.
The receiver counts the invalid transmitter signals it picks up, and informs you of the number of errors by a pattern of flashing.
1* flash = 1 glitch (2 to the power of 0)
2* flashes = 2 ... 3 glitches (2 to the power of 1)
3* flashes = 4 ... 7 glitches (2 to the power of 2)
4* flashes = 8 ... 15 glitches (2 to the power of 3)
5* flashes = 16 ... 31 glitches (2 to the power of 4)
6* flashes = 32 ... 63 glitches (2 to the power of 5)
etc.

We suggest that you experiment with various arrangements of your receiving system and power supplies in the model (receiver position, aerial position, receiver battery position, flight or drive battery position) and read off the glitch count after each test flight or test run. In this way you can establish the optimum installation of the components in your model by adopting the configuration which reduces the glitch count to a minimum.

Technical Specifications:
• 8 channels
• Frequency 40-41 MHz
• Single conversion
• Selection (narrow band) better 10 kHz
• Digital-Squelch
• Leightweight hard plastic case 13 g (w/o crystal)
• Dimensions 46 x 21.5 x 13.5 mm
• Long or short (minimum is 40 cm) aerial depending on preferred purpose
• Voltage range: 4-5 cells = 4.8 - 6 V nominal voltage = 3.6 - 9 V min/max.
• LED current: 1mA

* Splash water protection on the alpha-wW Series: Ideal for model submarines and boats.
And they do take more than a splash!

A high quality product - Made in Germany

Please note: Price without crystal.