RunRyder RC
 7  Topic Subscribe
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 3914 views
Scorpion Power Scorpion Power
HelicopterRadio - Servo - Gyro - Gov - Batt › Futaba TM-7 FASST/T9CHPs and eCCPM=heavy​interaction?! (SOLVED!)
09-14-2007 06:23 AM  10 years agoPost 1
superpin

rrNovice

Solna - Sweden

My Posts: All  Forum  Topic

<Check note further down!!>

Hi!

Just got my Futaba TM-7 FASST module and a couple of receivers, intended for use in my helicopters (all eCCPM...) together with my 9C super. If someone else have tried this, please let me know if you get the same result as I get, shown in this video (30 megs, sorry about that): http://heli.rodenkirchen.se/eccpm_fasst.wmv

The video starts with my old 35MHz module and PCM, and the second part shows the results with the FASST equipment. Please note that I never touch the cyclic controls in the second part, even if the results looks like I do...

Regards,
Ola

(edit: the video is 30 megs, not 40)

PM  EMAIL  Attn:RR  Quote
09-14-2007 06:53 AM  10 years agoPost 2
Trooper Sam

rrVeteran

Perris, California -​USA

My Posts: All  Forum  Topic

Wow....that's REALLY disappointing. I hope the TM-14 doesn't do anything like that, but to think that Futaba let this garbage out...yuk.

Trooper Sam

We do not do this to save money, we save money to do this-TheRickster

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 11:38 AM  10 years agoPost 3
Henrik Engert

rrKey Veteran

Cedar Park, TX

My Posts: All  Forum  Topic

That looks like ****! Luckily I am not running eCCPM Must be some explanation to the interaction. Are you sure the settings are correct in the radio? Bummer if everything is setup correctly on your side, I would return it right away if it were.

PM  EMAIL  Attn:RR  Quote
09-14-2007 12:24 PM  10 years agoPost 4
superpin

rrNovice

Solna - Sweden

My Posts: All  Forum  Topic

Well, I haven't found any settings to change and the FASST manual don't mention anything about helicopters or swash mixing. AFAIK there is no possibility to remap channels or do any other magic tricks in the 9C either? Any ideas are more than welcome!

Hopefully its something in my transmitter or the module that is broken or set up in the wrong manner, thats why I asked if someone else have seen this in my first post. I am rather surprised if I am the first to try the FASST module in an eCCPM heli, haven't they sold any modules at all?

(I haven't tested my second receiver, I will do that tonight to rule out that my first one is faulty.)

//Ola

PM  EMAIL  Attn:RR  Quote
09-14-2007 12:36 PM  10 years agoPost 5
Henrik Engert

rrKey Veteran

Cedar Park, TX

My Posts: All  Forum  Topic

I read about someone in the "Main discussion" that installed the TM-7 module in a 9Z radio. Search for him (username = 3dwanabe) and maybe you can ask him if he has the same problems. The majority seems to run eCCPM nowadays.

PM  EMAIL  Attn:RR  Quote
09-14-2007 01:22 PM  10 years agoPost 6
MrMel

rrProfessor

Gotland

My Posts: All  Forum  Topic

If you time the tail perfectly you could probably do piroflips with just pitch-pumping with that system

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 02:59 PM  10 years agoPost 7
fritzthecat

rrKey Veteran

Virginia Beach, VA

My Posts: All  Forum  Topic

I'm curious. The servo that was slower (front right of heli) which channel was it plugged into? If I remember right, FASST breaks up the channel sequence and transmits 1/2 the channels in one burst and the rest in the next burst. If Ch1 and 2 are send first, ch6 would always lag.
I have a 9Z and the FASST on order. I'll check it out when I get it.

Fritz


'Send Money, Women and Guns!'

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 04:12 PM  10 years agoPost 8
superpin

rrNovice

Solna - Sweden

My Posts: All  Forum  Topic

Fritz; I will check again tonight when I get home, but if my memory serves me right the "slow" servo (front right) is on channel six.

PM  EMAIL  Attn:RR  Quote
09-14-2007 04:35 PM  10 years agoPost 9
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

Fritz,
The input to the module and the output of the receiver are asynchronous. In other words, there is inconsistency between what goes into the module and when that data comes out of the receiver. Data going in comes out in the N, N+1, or N+2 receiver output frame. This causes the three channels used on the swash to get split up and spit out in a somewhat random fashion across multiple receiver output frames.

Since Futaba uses channels 1, 2, and 6 for the swash, channels 1 and 2 may be sticking "closer together" between in and out while ch 6 gets "separated" a bit more thus causing the largest effect on the ch 6 servo.

For comparison, a Spektrum module in a JR radio has a one-to-one relationship between input frames to output frames.

- John

RR rules!

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 05:36 PM  10 years agoPost 10
4eye

rrApprentice

Honolulu

My Posts: All  Forum  Topic

Isn't swash plate ccpm "dancing" common in the 9c radios due to latency between channels? I've never seen it but have read about it before.

CSM's cyclock might solve your prob if there is no other solution

PM  EMAIL  Attn:RR  Quote
09-14-2007 05:41 PM  10 years agoPost 11
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

4eye,
Yes, it has slight issues in PCM1024 mode. But in PPM mode, the output of the 9C is just fine.

- John

RR rules!

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 05:50 PM  10 years agoPost 12
bl8zn

rrVeteran

New Jersey

My Posts: All  Forum  Topic

No way!! Wow......

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 06:18 PM  10 years agoPost 13
raptorheli2

rrElite Veteran

rip off britain and​no changing it

My Posts: All  Forum  Topic

so does this mean the fasst system will always suffer from this and there is no cure?

i only today pre-ordered the 14mz solution from realraptors....i'm getting nervous.

cheers


www.waterfoothelis.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-14-2007 06:22 PM  10 years agoPost 14
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

raptorheli2,
Futaba's FASST solution for the 12 and 14 series could be different. Given the user's ability to update the radio's firmware, they have the chance to do it right. We shall see...

- John

RR rules!

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 06:24 PM  10 years agoPost 15
raptorheli2

rrElite Veteran

rip off britain and​no changing it

My Posts: All  Forum  Topic

thanks for the answer, so do that mean the lesser radios for lack of a better term will all suffer from this and possibly the mz aswell?

cheers


www.waterfoothelis.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-14-2007 07:28 PM  10 years agoPost 16
superpin

rrNovice

Solna - Sweden

My Posts: All  Forum  Topic

Ok, after a lot of testing and trying to figure out what exactly was happening, I found that a cell in the 4,8 volts NiMH reciver pack I was using had went bad! After mopping up another powersource it worked as good as I had hoped.

I probably owe Futaba an apology now, but I didnt check this kind of stuff earlier since I just swapped the reciever and used the same battery in both setups and the only difference in the setups where the receiver and transmitter module.

I will remove the original video since it doesnt give a true representation of the performance of the FASST module and receiver.

BTW, earlier today I got an email from a support rep at Great Planes claiming that they are "not able to go to outside websites to view material" so I needed to send the stuff in for warranty service.

Regards,
Ola (A much happier TM-7 owner!)

PM  EMAIL  Attn:RR  Quote
09-14-2007 07:30 PM  10 years agoPost 17
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

Superpin,
Please post a new video of how it works now.

Thanks,
John

RR rules!

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 07:30 PM  10 years agoPost 18
raptorheli2

rrElite Veteran

rip off britain and​no changing it

My Posts: All  Forum  Topic

NO, please leave it but take another video with a good battery to show the difference...it's a good reference point.

cheers


www.waterfoothelis.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-14-2007 07:43 PM  10 years agoPost 19
raptorheli2

rrElite Veteran

rip off britain and​no changing it

My Posts: All  Forum  Topic

oh can you confirm if fasst has model match, been looking without much success on this.

cheers


www.waterfoothelis.com

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-14-2007 07:48 PM  10 years agoPost 20
superpin

rrNovice

Solna - Sweden

My Posts: All  Forum  Topic

The video is back, use the same link. Its a bit smaller now, 14 megs and contains three clips, the original two recorded with the same faulty four cell receiver pack and a new one with the FASST running on 6 volts.

I wonder if the difference between the PCM and the FASST in the first two clips are because the FASST receiver syncs the servos so they start at the exact same time, draining the battery more than it could handle and stalling one of them?

I was also wrong about the channel, it was the ch1 servo that lagged behind. Perhaps makes sense if the receiver moved channel 1 and 2 first and channel 6 the next frame, and ch 2 starts a fraction of a second before ch 1?

And no, no model-match, the module have no clue what model you have chosen in the transmitter. Spektrum modules dont have it either, its simply not possible without modifying the transmitter.

//Ola

PM  EMAIL  Attn:RR  Quote
WATCH
 2 pages [ <<    <    ( 1 )     2     NEXT    >> ] 3914 views
Scorpion Power Scorpion Power
HelicopterRadio - Servo - Gyro - Gov - Batt › Futaba TM-7 FASST/T9CHPs and eCCPM=heavy​interaction?! (SOLVED!)
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Thursday, November 23 - 11:17 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online