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Warning. These receivers will blow up if plugged in the wrong way. Read this post before you use them.
Corona RD620II Dual Conversion Receiver 35mhz

The RD620II is the lightest (only 8.8g) 6-channel, full range, and ultra narrowband Dual Conversion receiver. Decoded by the onboard microprocessor, the resolution reaches 1024 in order to adapt to the digital servo and accurate servo. Like the DSP that all CORONA receiver uses, it rejects the glitch strictly. Compared with Single Conversion receiver, Dual Conversion receiver can reject mirror frequency more effectively if they have the same components and use the same DSP algorithm. Thus, it gets more reliability. For adjacent channel interrupt (with the transmitters of channe50, 51, 52, 53 working together, and not far way form them), RD620 can reject it more effectively. Inheriting CORONAs consistent style (small and light), both the size and weight of RD620 is the smallest. You can install it on Micro 3D CCPM helicopter or 3D fix-wing airplane in an easier way, and use it on small size, high speed and high-performance occasions. It can also be installed in the small size occasion, such as the indoor Micro Electric Aircraft, park fliers, etc. Of course, the full range and full performance of RD620 can be used in the occasion when long range is needed, such as the glider and large-scale glow plane. In addition, RD620 can deal with the busy flight situation, and guarantee the safety of the fly.
See the RD 620 User Guide for more details.


Giantcod Note:
The Corona range of receivers are extremely good when used in very "noisy" environments such as those found in electric powered models. Spurious interference generated by brushed and brushless motors and electronic speed controllers (ESC) is termed as "noise". This noise is of not audible but manifests itself as spurious interfering signals generated by high frequency switching electrical systems such as those found in modern ESC's. Receivers are of course very sensitive devices and are often confused by this interference which is so close in a model aircraft. The over used term "glitch" can be most times attributed to noise which is generated on board our models. Tests with transmitters close to the receiver can often mask this interference as the ratio of "signal compared to noise" is balanced in the receivers favour. But as the model is flown further away, the receiver will struggle to differentiate between the transmitter signal and the on board noise. Apart from very carefully optimised IF' filtering and double tuned front end design, the Corona receivers have another clever section built in. This is the DSP decoder, which is a tiny micro-processor with a set of memorised instructions embedded into its memory. These operate as a "digital signal processing" decoder to filter out the interference and send nice clean positioning data to our servos.

DSP:

Size	1.4”x0.7”x0.3”(35x19.5x7.8mm)
Weight	0.27oz/7.7g(with shrink wrap)
Sensitivity	about 2.0ìV
Selectivity	±8kHz at 65dB down
Number of channels	1-6
Filtering	Dual turned RF circuitry
Filtering	Dual 4 element ceramic filter
Filtering	DSP filtering in MCU with mild algorithm
Shift polarity	positive or negative (auto-detect)
Modulate	FM/PPM(pulse position modulation)
Case	Shrink wrap
Operating Voltage	4.8V~6.0VDC
Operating Current	11mA

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