pitstop000

My Feedback: (26)

Veritech

"Any truth to rumors that JR switching to frequency hopping FASST system?"

Well I usually don't get involved in these types of discussions but since all my jets are on Spektrum I have been following this with great interest. I wonder if the spketrum recall will have any impact on Horizon's decision to bring JR's frequency hopping systems into the US. The link doesn't specifically say what is causing the problem other then "Hazard: The receiver can lose contact with the model airplane glider's radio control while within normal radio range limits."

Yikes! If it can happen to their sailplane receiver I wonder if it is happening to their 9 and 12 ch ones?



http://www.aero-news.net/index.cfm?C...-461af0e2229f&

RAPPTOR

My Feedback: (41)

thanks for making it more clear.. i like my 10x.i know how to use all the functions. i just dont want to crash because or the radio..[X(][]

Crazy4Flight

My Feedback: (540)

I am still on 72 mhz, just waiting for the real 2.4 ghz fallout.

Ruizmilton

My Feedback: (29)

I finally decided to use FASST on my JR radio, Spektrum is not an option for me, feedback so far is positive, track record for FASST is very good and receiver prices are becoming more affordable. I will do my first test tomorrow before using it on my jets. I just hope JR does not take a lifetime to bring their own FHSS system into the market.

TSHARK203

My Feedback: (206)

I am going to keep using JR until the the proverbial sh1t hits the fan with it.

slarty

GUys,

I don't see why you are panicking... DSM2 will be supported by JR for a couple of years at least, and even when JR drops it in favour of DMSS for THEIR NEW SETS, Horizon & Spektrum will still be churning them out.

Far too many people think JR is a subsidiary company of Horizon and are based in Chicago !

rcjetsaok

My Feedback: (7)

Wrong again Buzzard breath !!!!!

D

RAPPTOR

My Feedback: (41)

hi,what jr radio did you change to fasst?? do they have a module for a 10x?? thanks

Steve Kent

http://www.ripmax.com/item.asp?itemi...tegory=060-150

This link shows the FASST module for JR sets from the UK distributor. It will be available in the US but I don't know where from try your Robbe dealer as I think it was them that had Futaba make it in the first place. I've been using one in my 9x2 (9303 in US I think) in all sorts of models including Jets for over a year & so far it's been 100%.

pitstop000

My Feedback: (26)

dubd

You're asking for information that hasn't been verified by Horizon or JR, so all you're going to get is personal opinions.

Ruizmilton

My Feedback: (29)

RAPPTOR:

The JM912 from Hobbico will work for all 10X radios, the 9303 and the 8103, on the 10x series you will loose channel 10 since the radio can only do 9 channels on PPM mode.

bobl2

My Feedback: (14)

The Hobbico web site doesn't list the 9303.

Ruizmilton

My Feedback: (29)

I have it on a 9303 and works perfectly, read on the link below, the 9303 is listed...

http://www3.towerhobbies.com/cgi-bin...?&I=LXXMV8&P=0

bobl2

My Feedback: (14)

Thanks, I searched Tower but couldn't find it.
Update: I have an X9303 so it won't work.

RAPPTOR

My Feedback: (41)

jr knew that ,,thats way they are getting rid of old stock..real scarry company..[X(][>:]

hyperdyne

My Feedback: (6)

I always get a kick out of people who want to change just for the sake of change.

"Yeah never had a problem with my gear but I am thinking of selling it and getting the other brand - just because I hear its better". In the engineering world I typically get a good laugh out of people who subscribe to that philosophy. It has zero basis and always ends up with a caveat that comes back to rear its ugly head. But to each his own.

Futaba's FASST is simply channel hopping DSSS. It's incrementally better than JR (technology wise) and only will lock you out with a highly improbable event which would be uncovered with a simple range check. I know chicken little only has to be right once, but I wouldnt bet money on it happening in the wild.

Ruizmilton

My Feedback: (29)

Hyperdyne:

Could you please explain in the simplest of terms (or just the relevant points) the differences between Futaba's hopping system and true FHSS?

Thanks

hyperdyne

My Feedback: (6)

If you want the long edition it is covered in detail in the other thread.

But, in simplest of terms - Futaba appears to be using direct sequence (just like Spektrum/JR) but channel shifting it around the 2.4G band. Whereas JR picks 2 frequencies and sticks redundant signals at these 2 different channels, Futaba does something similar but changes between all channels at a given hop period. It's a different way to skin the cat and can provide better interference mitigation for certain scenarios. But the concept is the same for both JR and Futaba systems.

True FHSS doesnt have a spreading code like DSSS. Basically is consists of a narrowband carrier that is hopped around in frequency with a known sequence. Its a different beast but is still a spread spectrum technique. Both FHSS and DSSS have pros and cons - which were covered in that huge thread here on RCU.

Given that Futaba's FCC paperwork declares a DSSS system and combined with the fact that their antenna diversity patent utilizes a correlator measurement from a DSSS system, it is conclusive they are not true FHSS - rather a hybrid FH/DSSS system. Heck, their own marketing statements say "channel shifting" and not straight out frequency hopping. If you take all those facts at face value it paints an unambiguous picture. I do know there are some that still don't accept it though...

slarty

1. Yes

2. Yes, it is called the XG7 and is advertised on various Far East Websites, also the UK importer has a sample set.

3. Nope, that would a Commercial In Confidence classed item.

4. Yes, as has been stated elsewhere. JR ( the Japanese manufacturer and not Horizon Hobbies for those of you who think JR is based in Chicago ) is going to be dropping DSM2 in favour of DMSS. Their new sets ( ones that are undergoing design and prototyping) will be DMSS and not DSM2. The 11X Zero may well be fitted with DMSS at some time in the future and possibly released as the XG11.

FILE IFR

Slarty, can the recent buyers of the 11X and 12X 'update' their Tx's to the DMSS when this change becomes available?

Rush!

On the JR 11X i use, the DSMJ module will have a successful range check at over 60+paces (0 frame losses, 0  holds) whereas my DSM2 (9303) radio has a difficult time at even 30 paces and often fails beyond 20 paces.    

I am not really sure what the difference in technology is between DSM2 and DSMJ but I am totally satisfied with DSMJ performance over DSM2.


Rob

Glen Roberts

Can the data loger be used on DSMJ? Although the range check is far better than the DSM2 the data loger seems to read garbage on the J.

Glen

Rush!

I have the data logger on the bind/data port on a 1231 rx and it works fine...