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Radio - Futaba FASST > Fasst with frequency jumping or Spectrum 2 ch.
 
 
iedit4tv
Senior Heliman
Location: Santa Clarita, California

I hope someone with greater knowledge than mine can answer this question: Spread frequency or spread spectrum?

The Fasst system in constantly moving through the 2.4 GHz spectrum. As long as the RX and TX are in sync I assume the bind is strong. But what happens when there is interference? Can the RX and TX unbind? And if they do, how do they regain the bind again, and will it produce a lock out?

As far as the Spectrum, it will grab 2 channels and if one goes, you have the second as a backup. But I've heard about problems with the Spectrum and static electricity, i.e., having to ground the boom if you use belt drive, and about brown outs when large current requirements cause the RX to go into reboot.

Another consideration is the satellite antennas of the Spectrum. Why are they necessary when the Fasst RX doesn't offer them? Is there something wrong with Spectrum where they need additional antennas for reception where the Fasst does not?

So many options here I'm must ask these questions before I upgrade my Futaba 9CHP to 2.4 GHz.

I'm hoping someone out there has experience with these systems and could answer some of these questions.

Thanks in advance for your help,
Mike

Cut - Print - It's a wrap!
09-02-2008 11:14 PM
 
 
kcordell
Veteran
Location: O Fallon, MO

I'm by no means an electronic genius, but both systems have been working very well. If you already have Futaba, don't be afraid of upgrading. Many have done this and will report no issues. If you feel the need to switch, I'm sure you will be happy as the other system works just as well. As far as locking onto 2 channels or hopping around, you will get many opinions as to which is the best. My bottom line is they both work, fly what you want, if you alreay have Futaba then you are part way there as all you need is a module and some receivers. Although it is nice not having to find a spot for 2 receivers in the model.

Team Futaba, Miniature Aircraft Pilot, YS Engines, VelTye
09-02-2008 11:35 PM
 
 
jsenicka
Elite Veteran
Location: Hampton VA

My buddies fly Spektrum (DX7), JR 2.4 (9203 and 12x) on a few Raptor 90's, Stratus, Fury, TREX 600E and 600N, etc. I fly Futaba 2.4 (12FGH) on 6 nitro Raptors.
Not a single issue in 3 months of heavy flying between all of us.

Pick the manufacturer you like, are loyal to, makes you cooler, whatever. Both work perfectly from a technology side.

Jim Senicka
2x TREX 700 Nitro Pro/OS91
3x R50V2/OS50/Kasama - 2x R90/OS91/Kasama
09-03-2008 12:22 AM
 
 
Fish07
Heliman
Location: USA

Fasst

Hello,go for futaba,been using Fasst on all my models ,gasser ,and foamys ,no problem ,just remember Fasst uses the whole spectrum.no way for interference.good luck.
09-03-2008 01:39 PM
 
 
iedit4tv
Senior Heliman
Location: Santa Clarita, California

Dependability Not Price!

I understand the difference between the Fasst spread spectrum and the Spectrum 2 channel system.

During my research, I was suprised to read that a second Fasst receiver can be added to the airplane or heli. Like the Spectrum remote antennas, I like that.

I recently lost a $4K camera ship due to a lockout with another 2.4 GHz system. I know it was a lockout because I have it on video! As you can imagine, the price of a system is not an issue; dependability is!

If you search Runryder for Spectrum lockouts, you'll find plenty of "Subjective" opinions on what caused their loss. However, if you search again for Fasst lockouts their pretty scarce.

Now in all fairness, the Spectrum system has been out longer than the Fasst system. The Spectrum system is more affordable than the Fasst system which would fuel its prevalence and market share. But again, I'm looking for dependability and not the lowest price.

So if price is not an issue and you're looking for the very best system, which of these two systems would you choose based on your experience and why!

Thanks,
Mike

Cut - Print - It's a wrap!
09-03-2008 03:31 PM
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

Quote 

As far as the Spectrum, it will grab 2 channels and if one goes, you have the second as a backup. But I've heard about problems with the Spectrum and static electricity, i.e., having to ground the boom if you use belt drive, and about brown outs when large current requirements cause the RX to go into reboot.

JR and Srektrum uses both channels at the same time,comparing data.
the futaba is not spread srectrum,it is not frequency hoping either.
09-03-2008 04:26 PM
 
 
iedit4tv
Senior Heliman
Location: Santa Clarita, California

Thank you for that info. I have been lead to believe that the second channel is only a backup if the first channel is swamped.

From what I've read on the Futaba site, the frequency changes every 2ms through out the the 2.4 band. Do you not consider this hopping? Perhaps the normanclature is incorrect and hopping is not the proper term.

Only a couple of days into the research, I'm leaning toward the Fasst system.

Cut - Print - It's a wrap!
09-03-2008 05:03 PM
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

Futaba had to drop the frequency hopping designation because it was not technically correct,they call it FASST instead.
09-03-2008 05:17 PM
 
 
jsenicka
Elite Veteran
Location: Hampton VA

Ford is better than Chevy!!!!

Sorry, this is heading in same direction. I really do not feel either RF design is appreciably better than the other. It comes down to
a. Brand preference
b. Receiver availability
c. TX side software capabilities
d. TX ease of use
e. TX feel/ergos.

Pick whichever meets your use criteria and assume the RF side is good. Choosing the TX because someone who did not design or test these systems says one RF scheme is better is like listening to the "I stayed at the Holiday Inn Express last night" guy

Jim Senicka
2x TREX 700 Nitro Pro/OS91
3x R50V2/OS50/Kasama - 2x R90/OS91/Kasama
09-03-2008 05:30 PM
 
 
Andi G
Veteran
Location: Switzerland

BS, it hops on 36 channels. Both systems work... so choose what you like.
09-03-2008 05:31 PM
 
 
DougV
Heliman
Location: Miramar, Florida - USA

DS8717:
Actually, Futaba FASST (Futaba Advance Spread Spectrum Technology) is both FHSS (Frequency Hopping Spread Spectrum) and DSSS (Direct Sequence Spread Spectrum)so it uses the best of both worlds.

Doug.
09-03-2008 05:35 PM
 
 
iedit4tv
Senior Heliman
Location: Santa Clarita, California

What amazes me is the Fasst system sequencing through the 2.4ghz band and able to talk with the TX as to where it is within the band.

Cut - Print - It's a wrap!
09-03-2008 05:55 PM
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

Quote 

DS8717:
Actually, Futaba FASST (Futaba Advance Spread Spectrum Technology) is both FHSS (Frequency Hopping Spread Spectrum) and DSSS (Direct Sequence Spread Spectrum)so it uses the best of both worlds.

Doug

In the US, FCC part 15 on unlicensed system in the 900MHz and 2.4GHz bands permits more power than non-spread spectrum systems. Both frequency hopping and direct sequence systems can transmit at 1 Watt. The limit is increased from 1 milliwatt to 1 watt or a thousand times increase. The Federal Communications Commission (FCC) prescribes a minimum number of channels and a maximum dwell time for each channel

Futaba doesnt meet these requirements for FHSS,so it now calls it channel shifting,Futaba does have a way with words.
DOUG
09-03-2008 06:00 PM
 
 
ChrisC
Senior Heliman
Location: Essex - UK

Have you has a look at the Youtube vids of Futaba and Spectum systems going up against 2.4 Ghz signal generator. Worth a watch before you buy

Here

Founder Member of Bearings Anonymous.
09-03-2008 06:18 PM
 
 
iedit4tv
Senior Heliman
Location: Santa Clarita, California

I read in the Futaba specs about its dwell time. They quote 2ms. Does this meet FCC spec?

Is that radios output 1 watt? Seems like a lot of power.

Cut - Print - It's a wrap!
09-03-2008 06:19 PM
 
 
rstacy
Key Veteran
Location: Rochester, NY

Quote 
What amazes me is the Fasst system sequencing through the 2.4ghz band and able to talk with the TX as to where it is within the band.

That amazes me too but admittedly I don't understand how it works.
Call it what you want...it does work.




www.kylestacy.com
09-03-2008 06:19 PM
HOMEPAGE  
 
 
DS 8717
rrProfessor
Location: Here wishing i was somewhere else

Quote 
I read in the Futaba specs about its dwell time. They quote 2ms. Does this meet FCC spec?


No it doesnt meet the specs for dwell time,this why they had to quit calling it frequency hopping and now call it channel shifting because it had to much dwell time to be FHSS.
09-03-2008 06:34 PM
 
 
flyingbajau
Senior Heliman
Location: Rhode Island, USA

Jsenicka is right on the money about the selection criteria

Lee
09-03-2008 07:02 PM
 
 
Fish07
Heliman
Location: USA

FASST

DS8717,looks like you work for sombody,in arizona,hmmmmm X$%,anyway with all test shown that Fasst HOPS!! and Spectrum Rocks!!,i think you are lost or paid to misinform people,just see all the test post thru the net and then let them judge by themself, Good Luck!
09-03-2008 10:23 PM
 
 
kcordell
Veteran
Location: O Fallon, MO

What difference does is really make what they call it? Channel hopping, channel shifting. The point is both work very well. Read all you want and make your decision. And the power output for US is 10 milliwatts I believe, very low, but not as low as if you were to use this system in France which is lower output. Now let's see the arguements on that!

Team Futaba, Miniature Aircraft Pilot, YS Engines, VelTye
09-03-2008 10:33 PM
 
 
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Radio - Futaba FASST > Fasst with frequency jumping or Spectrum 2 ch.
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