Among Corona receivers, from crystal receivers to synthesized ones, from
single conversion receivers to dual conversion ones, from 4ch to 8ch,
there must be one type suit for you. DUAL Conversion Receiver
RD620II Receiver CORONA never stops improving the receiving range. RD620II
has improved the receiving range as far as 1.8Km
(checking range on ground). If we use traditional technology, how big the
receiver should be made to reach such a far receiving range?
||8.86(with shrink wrap)
||±8kHz at 65dB down
|Number of channels
||Dual turned RF circuitry
||Dual 4 element ceramic filter
||DSP filtering in MCU with mild algorithm
||positive or negative (auto-detect)
||FM/PPM(pulse position modulation)
Dual conversion receiver can eliminate mirror frequency interference
efficiently. Usually single conversion receiver uses IF of 455MHz, and
there is 1MHz bandwidth of RF frequency (72.010MHz-72.990MHz).
0.445*2=0.910MHz, so if the transmitters of 72.010MHz and 72.910MHz (or
72.930MHz) turn on at the same time, single conversion receivers will be
interfered from each other. While dual conversion receiver uses IF of
10.7MHz, so RF frequency of 1MHz bandwidth will not happen mirror frequency
Further remote control distance means more reliable control. Even the
reliability can compare beauty with PCM receiver. PCM receiver has good
reliability because it uses CRC code to fill up the wrong codes which
leading by shortage of receiving range. The signal will always seem to be
fine ostensibly, but CRC code of PCM began to fill up “bad data cavity”
which happens at times while exceeding half of the distance described by
manufacturer. PCM code wastes a lot of time to receive more data to fill up
the cavity of “bad data”. So usually we feel that PCM receiver has no
glitch, while its response speed is less than PPM receiver.
We make control distance be further so that receiver can locate in stable RF
Electromagnetic Field, it will make the reliability of Corona receiver
approach to PCM receiver. Meanwhile, its response speed will not be
With improved circuit design, RD620II advances IP3 performance apparently,
and it can even compare beauty with all famous brand receivers around the
world. IP3 performance of a receiver is vital for serried R/C transmitters
working at the same place. A receiver with lower IP3 will still working
fine when 1-2 transmitter with adjacent channel working in the same time,
but once open the third adjacent channel transmitter, the receiver will lose
control immediately if it has poor IP3 performance.
The light weight and small size of RD620II predominate in other receivers.
Furthermore, we have moved the crystals of RD620II to side face, which
really improves the reliability of replacing crystals.
We have also improved DSP. It can make more strictly filter about received
signals and eliminate glitch efficiently.
You can put RD620II receiver in any place when you install it on whatever
electric puddle-plane, 3D plane, glider or training plane. And don't worry
the trouble which will be brought by changing CG.
Strong reliability and anti-interference performance make RD620II receiver
especially adapt to work with electric helicopter which flies at bad
electromagnetic environment. RD620II can work well even near high power
motor (similar to TREX600CF) and 100A pulse current interference.
RD620II receiver has the structure of level inserted pin by special design
and assorted with super thin electronic parts. The thickness of RD620II
receiver is only 7.2mm which make the installation more convenient.
Reliability, high performance and sale price, they are what CORONA can
provide for you.
See the RD 620II
User Guide for more details.If you are
interested in R/C technology, please look over the
technologies that we adopt.