(This is part of a multi-part series on building a FPV mini 220mm quadcopter)

These next parts aren’t really that exciting but much needed for controlling the quadcopter.  I already have a Futaba 9C controller that features a neat little module system.    So I just needed to purchase a FrSky Transmitter Module that works with my Futaba controller — the FrSky FF-1 2.4Ghz Combo Pack for Futaba w/ Module & RX), it’s only $39 for the kit.


The FrSKY module uses the new ACCST technology that seems to be the latest “standard” for these copters.  I’m used to the old school crystal based AM of PCM FM based radios of yesterday so we’ll see how this works out.   It seems like 2.4Ghz is the way to go for many reasons and I’m happy that I don’t have to invest in a new transmitter/controller.

Features of the FrSky FF-1:

  • Advanced Continuous Channel Shifting Technology (ACCST is our advanced tecnology it shifts channel hundred times per second and there is no signal conflicts and interruptions) robust frequency agility.
  • Easy to bind and very fast link-up.
  • Excellent reboot time.
  • True Diversity with two antennas.
  • All channels can be programmed with Failsafe, quickly and easily.
  • Quick and extremely stable in performance.
  • Precise and smooth servo response.
  • Extended range (1.5km-2.5km).

Transmitter Module is compatible with the following transmitters:

Futaba: 3PM, 3PK, 7U, 8U,8J,  9C, 10C, 9Z, FN-Series, T10C, FC-18, FC-28.
Hitec: Optic 6, Eclipse 7, Prism 7

 The next related part is the receiver.  I ordered a FrSky D4R-II 4ch 2.4Ghz ACCST Receiver (w/telemetry).


This was Steve’s recommendation since it’s light weight, compatible with my Futaba using the FrSky module and provides telemetry.  For those of you that don’t know what telemetry means, it can send back to the ground station / goggles information about the aircraft.  For example, it can send battery warnings and reception issues.   This part costs $21.37 from Hobby King.

Features of the FrSky D4R-II:

• RSSI (PWM) and CPPM output.
• Lighter weight and physically smaller than D8R-II & D6FR
• Integrated warning alarm for low voltage, poor reception, etc.
• One external analog telemetry port and one digital data-stream port (Connects to FrSky Sensor Hub FSH-01).

Weight: 5.8g
Total Weight So Far: 14.8g

Part Cost: $59.89
Total Spent So Far: $105.23

Both parts are available for purchase from Hobby King

Part 4: DIY: Building a Mini (220mm) Quadcopter – The Battery

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