FrSky Two-way 2.4G 4-Channel Receiver D4R-II

Features

1) Firmware upgradeable;

2) One external analog telemetry port and one digital data-stream port (connect to FrSky Sensor Hub FSH-01);

3) CPPM output and RSSI (PWM) - If CH3 and CH4 are connected by a jumper, CH1 will output CPPM for CH1~CH8, and CH2 will output RSSI (PWM);

4) Lighter weight and physically smaller than D8R-IIplus & D6FR;

5) Alarm warning on low voltage, poor reception, etc.

Dimension: 40*22.5*6mm

Weight: 5.8g / 5g (naked)

Operating Voltage Range: 3.5V-10.0V

Operating Current: 60mA

Operating Range: Full Range (>1.5km)

Resolution: 3072 (>11bit)

Compatibility

Compatible with FrSky two way telemetry modules: DFT, DJT, DHT, DHT-U

Includes:
1 x D4R-II two-way receiver

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VirginiaJim
STD member

Question :
Sorry, I'm a newb. What does CPPM stand for? What equipment is needed to use this digital port? If we must jump ch2 and ch3 to turn on the CPPM feed, how do we still control the ch2=aileron and ch3=elevator control surfaces? Is a hub necessary to split out a signal for these servos? Is a CPPM/SBUS decoder needed? How is all this connected? Please do not reply unless you have made this work yourself.
September 07 2013 Was this question helpful to you?

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Discussion of this question:

Cppm means compressed ppm signal. It aggregates 8 channels together into one signal.
Usually used in flight controllers and Flybarless heli controllers.
It's used to reduce the amount of wires used between devices.
You either choose to run this receiver as 4 channels only, or choose cppm if you have a flight controller that can decode cppm.
S-bus is a similar idea but invented by futaba and not compatible with cppm.

-- Nov 16 2013 by w****x

There are separate cppm decoder for sale elsewhere, but it's just much cheaper to buy a full 8ch receiver if you want separate channels.
-- Nov 16 2013 by w****x

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