Futaba FHSS and FAST

[carpwally]

Hiya can someone tell me in simple terms what the difference is between FHSS an FAST and can I use one Receiver for Both??

[Rob O]

FHSS is Futabas newer entry level system ie its much cheaper than FAST sets mate . The Receivers are not compatable . Other than that i dont know the technical diferences but i think at the moment there is only a 6 ch set but that may well change if not allready . Hope this helps . Rob

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[vanman]

Hi as rob o has said fhss is futabas cheaper systems i think it channel hops but dont quote me

[xygax]

Get fasst it's compatible with all futaba 2.4 stuff except fhss

Steve

[Disc]

Expect Futaba FHSS Bind and Fly to Arrive shortly though

That is one of the reasons for FHSS to go bind and fly models small electrics etc etc

But FaSST is the best of the 2 systems overall

[Mslater]

FHSS - Frequency Hopping Spread Spectrum - is a generic term for the technology - like calling an engine "IC" they're all IC but the bits don't necessarly fit one another! So it is with FHSS - its the general term but the detailed implementation will be different so different FHSS systems will not speak to each other.

The thing about spread spectrum technology is that its not really one system - its really just a "concept" or the shell/outline of the idea. There are in practice lots of different ways you can actually implement it. In fact there are probably an infinity of different ways in terms of the details like like what error checking systems you build in, what ID systems etc. etc. Spread spectrum is in reality an algorithm - how you actually code, or program, that algorithm to realise your particular system, and still stay within the basic outline, is up to you. One way of thinking about it is that Spread Spectrum is a computer program - not hardware - so you can design it - within a set of rules - exactly how you want.

For Futaba FHSS is the name they give their most basic implimentation of the shell. Limited "bells and whistles" - just a straight forward implementation of how to send control signals from a transmitter to a receiver - full stop. Its only available on their basic (I think 4 channel only - not sure about that) systems.

FASST (Futaba Advanced Spread Spectrum Technology) - is a different beast. Yes it does the command transmitting thing, just like FHSS, but it has lots of additional information in its specific coding. Information used to achieve lower error rates, better error detection, faster operation, more sophisticated techniques for deciding on channel swaps and so on. In addition it has lots of software "hooks" for future expansion - for example see the new S-bus system Futaba are pushing. FASST will be "future proof" for some time and more new developments will come.

All this increased sophistication and complexity needs more complex receivers and transmission elctronics - hence why FASST systems are more expensive.

Thanks to Biggles Elder Brother.
Modelflying.co.uk

[carpwally]

wow thanks Mslater that was a mouthful,think I will stay with my fasst system