FHSS Shaping

Frequency Hopping Spread Spectrum allows the Transmitter and Receiver to hop very quickly between frequencies.

The enables a variety of improvements such as:

  • Better resistance to interference

  • Higher reliability

  • Better performance with multiple pilots

FHSS is not encryption, but it primarily used to enhance the practical performance of a radio system.

NOVALINK supports FHSS on the 70 cm HAM band through the Ortho parameter.

The bind phrase mechanism minimizes interference between different mLRS systems operating in the same RF band. However, the possibility of mutual interference is not eliminated since the set of frequencies generated from different bind phrases can overlap. The ortho mechanism modifies the set of frequencies generated from a bind phrase into three further sets which are guaranteed to be strictly different (hence the term orthogonal). This allows for up to three mLRS systems to stay out of each others way.

To activate, set band to 70 cm HAM and change the Ortho setting.

NOVALINK radio system

  • off: normal behavior
  • 1/3: the 1st out of the three available frequency sets is used
  • 2/3: the 2nd out of the three available frequency sets is used
  • 3/3: the 3rd out of the three available frequency sets is used

In order to use the ortho mechanism, mLRS systems need to be configured with the same bind phrase, but use different settings for the Ortho parameter. Ortho should not be set to off for any of them.

For more details, please visit the mLRS Official Documentation for FHSS Shaping.