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Old Jun 18, 2013, 09:05 PM
Jim C Patrick
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Shenandoah County
Joined Jan 2008
851 Posts
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2.4 GHz protocol FAQ ?

There's lots of threads about specific radios, even a couple comparing two, but none have an overview of the 2.4 radio market and choices. I'm a 72 MHz flyer, but knowing I'll have to switch in the new few years, I'd like to know what the different strengths and weaknesses of the newer types.

Price is easy to find, but how the radios work (or don't!), what features they have, and how the features actually pan out is harder to find. There's a lot of hype, but few comparisons.

With an alphabet soup of types, what do the abbreviations stand for? How can a person quickly find the major differences in these radios? Which are bidirectional and/or have telemetry? How about jam resistance, auto-rebinding, or reacquire signal? Which are trustworthy with a $1000 plane?

My current 72 MHz transmitters work with Futaba, JR, MPX, and Hitec recievers. From what I have read, cross compatibility is not as good at 2.4 GHz. Which of these work with what other types?
  1. AFHSS (Hitec)
  2. DSM
    • DSM2 (Spektrum) works with Spektrum DSM2 or DSMX or JR DSM receivers
    • DSMX (JR) backwards compatible with DSM2
  3. FASST(Futaba) continuous channel shifting and dual antenna diversity. FASST is both DSSS modulation (like DSM2) and FHSS (frequency hopping) - much like DSMX. So what is DSSS? And what are these?
    • FASST with TM-(nn)
    • FASSTest -compatible with all FASST and S-FHSS systems, bi-directional
    • FHSS or S-FHSS (Frequency Hopping Spread Spectrum)
    • SBUS2 Fasstest

Then the newer contenders:
  1. Assam
  2. Fly Sky
  3. FrSky - ACCST v FASST?
  4. HobbyKing (orange)
  5. RangeLink
  6. Turnigy
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Old Jun 19, 2013, 04:26 AM
Registered User
Joined Aug 2002
5,811 Posts
Quote:
Originally Posted by jcpatrick View Post
There's lots of threads about specific radios, even a couple comparing two,
but none have an overview of the 2.4 radio market and choices.
I'm a 72 MHz flyer, but knowing I'll have to switch in the new few years, I'd like to know what the different
strengths and weaknesses of the newer types.
Price is easy to find, but how the radios work (or don't!), what features they have, and how the features actually pan out is harder to find.
There's a lot of hype, but few comparisons.<snip>
The major brands are stand a lone except for a couple of aftermarket receivers designed specifically to operate with either Futaba or JR/Spektrum .
A recent addition will operate with Hitec AFHSS and even newer 8Ch Rx from the same stable which is switchable between Futaba, Hitec & Frsky.
. The Delta Receiver - Hitec, Futaba and FrSky compatible! .

A recent system is SLT used by the Tactic Anylink TX-R model aircraft
and an increasing number of other brands e.g. built in as an extra feature of the new
. Hitec Aurora 9X which has both the Hitec AFHSS system and SLT.
. SLT models, being open source, are also being released by Hitec RCD and other brands.
. Tactic Anylink Module - Aurora 9 Setup, includes all other Hitec Tx. for operation of all the SLT TX ready models.

Unfortunately, whilst question has been asked many times, it is not as easily answered as were the old PPM systems, good reading:
. 2.4Ghz - The Chronicles - How to instal for best results & history of various system problems. gets more interesting toward the end.
. 2.4Ghz - Is It All It Is Cracked Up To Be ? MAN reveiw (& Problem Areas)

There are also some good video on understanding the 2.4Ghz systems at top of:
. Aurora 9, AFHSS 2.4Ghz Module, Transceivers_Receivers & Telemetry,

Much more information available under sub section:
"2.4 GHz RC Systems"
below
"Radio Systems, Accessories, Alterations and FAQ" at
Alan's Hobby, Model & RC FAQ Web Links

Alan T.
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Last edited by A.T.; Jun 19, 2013 at 05:18 AM.
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Old Jun 19, 2013, 08:36 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
23,495 Posts
Quote:
Originally Posted by jcpatrick View Post
[*]DSM
  • DSM2 (Spektrum) works with Spektrum DSM2 or DSMX or JR DSM receivers
  • DSMX (JR) backwards compatible with DSM2
DSMX is a Spektrum product that both Spektrum and JR sold.
DSMJ is a Spektrum product that only JR sold.

DMSS is the JR-only one.

Andy
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Old Jun 19, 2013, 02:26 PM
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Joined Mar 2008
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Andy,

Isn't DSMX the US designation for DSMJ ?
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Old Jun 19, 2013, 03:26 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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Nope. It's totally different.

Andy
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