The Flite Test Beginner Series is brought to you by Horizon Hobby.
Episode 8: Transmitters
Transmitters (TX for short)
What do they do?
Transmit the control information to your plane.
Things to consider when you are looking for a transmitter are Frequency, Number of Channels, Modes, Advanced Functions, and Cost.
Frequency / Protocol
72 MHZ -
- Longer Range
- Can interfere with others
- Most common
- Shorter antenna
- Frequency hopping
- Proprietary protocols - Brand specific
Number of channels
4 or 5 Channel - Throttle/Rudder/Ailerons/Elevator
- Less expensive
- Not good to grow with
- Usually come with RTF
6 or more - Throttle/Rudder/Ailerons/Elevator/Landing Gear/Flaps
- 6 channels is usually all you need
- More expensive radios have nicer gimbals
- 1 and 2 are most common
- Everything Flite Test does involves MODE 2
- Different modes aren’t better… just different
- Display Screen
- Multiple Model Memories
- Training features (Buddy box)
- Expos - Gives you more precise control but still lets you use the full throw.
- Dual rates - Makes the servo move less or more in relation to the stick.
- Mixing - Example: Elevons http://flitetest.com/articles/Elevon_Mixing_
Cost - What makes the price go up?
- More channels
- Better quality
- The price of the RX’s
- Advanced features
- Better resolution
Video explaining both expos and dual rates: http://www.flitetest.com/articles/expos-dual-rates
Makes the stick softer around mid-stick (or quicker depending on the direction!)
Comes from the exponential curve in mathematics
Negative values on futaba and hitec, positive on Spectrum
Gives you more precise control but still lets you use the full throw
- Video explaining both expos and dual rates: http://www.flitetest.com/articles/expos-dual-rates
Makes the servo move less in relation to the stick
Usually set up on a switch so you can switch in mid flight
Great for maidening new planes
Some people prefer dual rates over expos (We say use both)