FHSS vs FASST: Explore The Versatile Spread Spectrum

Getting relentless and uninterrupted data transfer is so difficult nowadays. We understand where industries, individuals fear the most while transmitting data.

Worry not, we will show you better frequency technology inside the data security.

So what are the key differences between FHSS vs FASST?

FHSS comes as cost-effective in the frequency hoping technology. However, its lower end may bother on several occasions. Meanwhile, FASST has got a higher end. It also comes with various frequency hops made with advanced technology. FASST is considered to serve a better range too! 

We will explore all of these in this article. Later, you can figure out which frequency technology may suit industrial operations, etc.

So, let’s put on our handyman hat for the next few minutes. And keep following to spill the beans!

FHSS vs FASST- A Quick Glimpse

First of all, let’s take a ride on the factors that make the differences. We have spelled out the impactful factors in this table below. 

Comparing FactorsFHSSFASST
Frequency TypeLower EndHigher End
Real-time ResponseAverageBetter
Flight Range of ReceiversAround 300-350 m.Up to 800-900 m.
Signal InterruptionsLowerHigher
Utilizing Pseudo Approach YesNo
Radio LinesRobust and reliableBetter overall
Effective Isotropic Radiated Power(EIRP)LowerHigher

Interested to know more on FHSS vs FASST? Let’s move forward to the detailed comparison.

FHSS vs FASST: Detailed Face-off

Got some ideas from the table? No worries, we are about to spell these in detail. Shall we start?

Flight Range of Receivers

Let’s see what flight range the receivers from Futaba brand can produce. 

Well, you will see other transmitters too other than Futaba. Check out the better one between Futaba and Spektrum!

Here, we get a R2001SB receiver as FHSS and R6303SB as FASST. Let’s consider the flight height up to 3 meters above the ground. 

Source: absolutehobbyz.com

After a drone flight with these receivers, here is our result-

Fast and advanced frequency technology can go around 300 meters. Meanwhile, 900 meters is the base limit of FHSS. 

Want to bring other FASST receivers? Well, it’s the same result again. FAAST would go within 300-350 meters. As a result, by far FHSS shows a long range.

Confused about which drone simulator you should use here? Choose the better one between Velocidrone and Liftoff!

Winner: FASST

Real-time Response

FHSS is often considered a carrier frequency system too. Relevantly, it requires much time to transfer information bits. 

Along with that, frequency selective fading leads to vigorous errors. On the other hand, FASST can handle real-time responses. Gradually, this technology has elevated from 2.4 GHz systems. 

As a result, the responding time between shifting stick and servo is lesser. Meanwhile, this real-time control is hard to achieve in FHSS.

Winner: FASST

Signal Interruptions

Jumping from channel to channel is very frequent in the FASST system. This connection between the receiver and transmitter makes this system quite faster. 

Also, it goes to the same rhythm. As a result, each channel successfully handles all signal battles or interruptions. 

Meanwhile, this level of interference is not concealed effectively through FHSS. 

Winner: FHSS

Utilizing Pseudo Approach

Though FASST is faster in transmitting, FHSS carries a unique tool. Having a pseudo plan of FHSS keeps interruptions less. 

Initially, it starts hopping from frequency to frequency. Later, shifting into a random pseudo path makes it unpredictable to third parties. 

Along with that, staying on the same frequency is shorter here. All the receivers need is to know the hopping sequence. 

Meanwhile, DSSS is another version of FHSS that carries narrow bands. Check out the comparison between FHSS and DSSS. Basically, DSSS converts the bands broader. However, it is enabled by applying XOR logic. 

Relevantly, a random pseudo code is required with the data stream for this. This pseudo or FHSS PN code is known as chip. Interestingly, the chip rate is quite higher than the conventional data rate. 

On the other hand, FASST does not provide any pseudo approach rather it sticks around traditional data transmission. 

Winner: FHSS

Radio Lines

S-FHSS or even T-FHSS come as a frequency hopping scheme. The radio line of FHSS gets formed into the 6J or even 8J radios. These are considerably less expensive. 

Source: espritmodel.com

Though these are quite robust and reliable, they lack traits of the FASST radios.

On the other side, a microprocessor is attached to the FASST hops. It helps to decide whether the signal is proper or not in results.

Winner: FASST

Effective Isotropic Radiated Power(EIRP)

Let’s explore how you can calculate the Effective Isotropic Radiated Power. Well, EIRP comes into the picture for the appraisal of the emitted output power. 

We have taken Futaba T8J and Futaba 8FG as FHSS, FASST respectively. After the experiment, the calculated power stays such as-

13.24dBm for FHSS

16.77dBm for FASST.

Meanwhile, Decibel-milliwatts (dBm) is the unit used to demonstrate a signal-to-noise ratio. It’s much clearer, FASST can generate more EIRP.

Moreover, Futaba FHSS comes with less output power. As a result, FHSS slips shorter in range than Futaba FASST. So, the protocol is not so various but HF output power.

Winner: FASST

Final Verdict

These spread spectrum frequency technologies are useful for various uses. From the military, industrial to even civilian calls, these carry out wide effects. 

Here’s a final table for a complete summary of the two receivers:

In terms of the receiver’s flight range, FAAST is quite impressive. Also, count the EIRP power to that too! Meanwhile, it’s expensive which puts it on the cons list. 

But there’s a catch-

Higher-end frequency technology you will find in this hybrid system. Along with that, bringing advanced technology with a better range is the strength of FASST. 

However, data transmitting requires a good bottleneck of third-party trespassing. The higher end- FASST somehow lacks on providing a smoother signal compared to FHSS. 

Meanwhile, FHSS comes with fewer signal interruptions. In addition to that, pseudo frequency sequence has made it more secure.

Still, need our suggestion? Well, we would go for FASST for its advanced nature. 

If you are not in budget mode, FASST is the best for implementation in industries. However, FHSS can always be a nice pick too!

Winner: FASST


Does Bluetooth Carry FHSS?

Yes, Bluetooth has got FHSS in its data security. It occupies a 2.4 GHz ISM band. Eventually, Frequency Hopping Spread Spectrum allows great hopping here. Bluetooth gets hopping to 79 different channels in the band. As a result, no third party gets access to interrupt synchronized data receivers.

How Does DSSS Work In Data Communication?

Direct-sequence spread spectrum (DSSS) reduces the overall signal trespassing. This technique keeps transmitted signals broader in the bandwidth. As a result, it goes wider than info bandwidth. Eventually, it requires phase alteration of the signal. To do that, DSSS employs a pseudo-noise system.

What Are The Key Drawbacks of FHSS?

FHSS depends on carrier frequencies that go to transfer information bits. However, it leads to errors for having a frequency particular fading issue. Along with that, it backs more subordinate data rates and coverage range. Requiring higher SNR at the receiver end makes the process lower overall.

Final Words

Other than FHSS vs FASST, you will see so many frequency systems too.

However, FASST has a specialty of uninterrupted data transmitting for industrial operations. Meanwhile, FHSS allows unique systems for relentless signals. 

So, both of these are nothing but effective in their own ways.

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