F.H.S.S. Technology? LRP Explains!


LRP explains what makes the revolutionary F.H.S.S. radio technology this outstanding and why all the latest 2.4GHz radios releases are so superior!

For a lot of people, understanding the term FHSS is not an easy thing to do. Nowadays you can read it everywhere it is praised for its simplicity and easy usability. But what is it that makes the difference and the new FHSS 2.4GHz radio technology so superior. How does it eliminate all problems of interference and reaction speed? How does it work?
This will help you to understand the main advantages and benefits from using the 2.4GHz F.H.S.S. radio signal technology.

To start, when the 2.4GHz technology first entered the RC modelling market, it was with a transmitter technology that for easy to understand issues simple was called 2.4GHz. This technology allowed the user to operate its radio without frequency crystal. And therefore, also eliminating the extremely irritating problem of interference and people running on same frequency. A solution everybody loves and uses in order to gain interference and trouble free running transmitting. In real the system is called F.H.S.S. technology and stands for “Frequency Hopping Spread Spectrum”. The Frequency Hopping system was developed long time ago for the simple reason that it became apparent that a wireless signal that is being sent through a frequency band had to be secured from being “disturbed, intercepted or interfered with in any way”. The F.H.S.S. was invented and since then continuously developed.

Spread spectrum (F.H.S.S.)

The signal “Spread-spectrum” is unique as the technical method of creating a spread-spectrum signal is based on electromagnetic energy generated in special bandwidth and which is “spread” into special frequency domains. The result of this complicated method is a signal with a much wider bandwidth that’s why we call it “Spread-spectrum”. Spread-spectrum transmitters use similar transmit power level to “normal” narrow band transmitters. Because Spread-spectrum signals are so wide, they transmit at a much lower spectral power density, measured in mW, than “normal” narrowband transmitters. This lower transmitted power density characteristic gives the spread spectrum signals a big plus. Spread and narrow signals can occupy or “use” the same band, with little or no interference. This capability is the main reason for all the interest in Spread-spectrum today. For example this new developed technique is used for various of reasons in the industrial world. Military has been a long time fan of the “spread spectrum” technology for their radio communications, for the reason that it is so strong against resisting jamming and is hard for the enemy to intercept and interfere with. But for us RC modelling people the main benefit is the establishment of secure and fast communication without interference, in our case between the transmitter (radio) and receiver in the chassis. Increasing the resistance to interference and improving the handling control “feeling” of your car due to the fast transmission between radio and car.


Spread-spectrum signals are extremely resistant to narrowband interference, the procedure of receiving the spread-spectrum signal is stronger than the interfering signal, no interference effect.
Spread-spectrum signals can share a frequency band with many types of conventional signals without any interference. Therefore bandwidth can be used more efficiently.


Frequency Hopping (F.H.S.S.)

The name itself “Frequency Hopping Spread Spectrum” is very self-explanatory. Frequency hopping is a system that transmits through a narrow band of the spread spectrum signal and then suddenly and rapidly jumps “hopping” through a fixed set of frequencies, only to stay on each frequency for just a few milliseconds. So in just 1 second you will have used over hundreds of different frequencies without noticing it. So in other words, the F.H.S.S. is a technique of transmitting radio signals by rapidly changing the frequency holder over many frequency channels, using a special coded switch sequence, that is only known to both the transmitter and receiver. This special coded sequence is called “pseudorandom”, which means it is a process that appears to be random but its not. Before “hopping” to a different frequency the system checks if the frequency is occupied and trouble-free. The whole procedure is so fast that it isn’t notified by either the drivers or electronics!


During a 5 min heat the frequency has jumped over to other frequencies appr. 10000 times. So if a frequency is interfered the system quickly jumps through to the next free frequency without noticing. In comparison to a normal FM crystal frequency system or D.S.S.S. 2.4GHz where only one frequency is used. When this frequency is interfered you have no chance but to stop your race.


The graphic table shows an easy illustration of how the F.H.S.S. technology works. For every step in time, the frequency jumps over to another frequency in a seemingly random order, called pseudorandom order. An order only known by the transmitter and the receiver.

We at LRP hope that we could explain the F.H.S.S. technology to you and what advantages you gain when using a radio system with the revolutionary F.H.S.S. technology. Next time you hit the track, think about the years of development and technology that has gone down to help you keep your car on the race track!

LRP C3-STX Pro 2.4GHz F.H.S.S. 100mW Transmitter Set

LRPs radio transmitter system, the C3-STX Pro 2.4GHz, featuring integrated and revolutionary 2.4GHz F.H.S.S. technology.

All new F.H.S.S. Technology with 100mW power

The latest F.H.S.S impresses by its unique reliability and highly secure transmission. In comparison to the D.S.S.S. technology the new method of transmitting radio signals uses a certain frequency just for the blink of an eye. Even if the carrier frequency is getting disrupted the interference is just affecting a fraction of the entire signal.

Crystal and interference-free 2.4Ghz technology

With the 2.4GHz technology you do not need to worry any longer about radio interferences. Problems with frequencies are history!

Adjustments possibilities for your C3-STX Pro 2.4GHz F.H.S.S. transmitter

Digital dual rate steering (EPA), Digital throttle and steering trim, model-memory, 3-step anti-lock braking (ABS), exponential function (EXP), lever for channel 3

High-performance package includes:

New F.H.S.S. technology, 2.4GHz Mini 3-channel receiver, LED battery status display, ergonomic grip and steering wheel in pistol design, outstanding price/performance, charge socket for optional NiCd, stylish package box for transport.


Source: LRP

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