RunRyder - Servo sync or grouping on 12fgh 2.4?

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Radio - Futaba FASST > Servo sync or grouping on 12fgh 2.4?

Amarjit
Senior Heliman
Location: Chicago, IL

Hi everyone,

I noticed that my servos are not all moving at the same intervals in a ccpm setup. Does someone know if the 12fgh 2.4 allows for servo sync or servo grouping?..similar to the JR setup on the collective servos?

Thanks,
Andy

01-17-2008 03:24 PM

Vic-rex600
Heliman
Location: San Jose, CA

Are you using FASST 7CH or FASST MULT mode?

FASST MULT mode perfectly syncs eccpm on my 14 chan rx that came with the 12FGH 2.4 system. So I don't know what you're talking about.

01-17-2008 03:39 PM

Amarjit
Senior Heliman
Location: Chicago, IL

im using faast 7ch

does it matter you think?

andy

01-17-2008 04:24 PM

bparro
Veteran
Location: indianapolis,in

yes, it matters. You have to change the rx mode in the radio.

01-17-2008 04:45 PM

Amarjit
Senior Heliman
Location: Chicago, IL

thanks...i did that though...

went to 7 channel in the radio. Otherwise, the receiver would not even turn on. The problem already exists prior to me doing this.

Is there any other function that I can use? WIthout changing it to 7 channel mode in the radio, it would not recognize the receiver.

Andy

01-17-2008 04:59 PM

Amarjit
Senior Heliman
Location: Chicago, IL

So, Called up Futaba support

Made a call into futaba support, and they are telling me that

1. I have to enter into a swash mix program to get the servos to synch. Which means that I have to eyeball things to ensure that they are indeed true. Not a mechanism I am comfortable with. I mean, if the DX7 of all things allows for this, the Futaba 12 channel system should include this functionality.

2. I was also told that the 14 channel receiver is THE ONLY receiver that has 2048 resolution.

I explained to the individual that people on runryder have no issues ensuring that the servos move up collectively in a CCPM format using the other receiver....I asked if it could be the fact that I am using the 617 receiver. This apparently is not the case.

Now, I am unsure how I can resolve this problem. I am resorting to runryder since the pleasant bedside manner of futaba support is not sufficient.

Andy

01-17-2008 06:42 PM

JKos
Elite Veteran
Location: Town of California in the state of Maryland

Andy,
I will soon have a 617 in my hands and I'll be checking out differences like this when used with a 12Z and TM-14.

- John

Protos -- Logo 14 -- Logo 10

01-17-2008 07:41 PM

Amarjit
Senior Heliman
Location: Chicago, IL

FYI

http://www.rcuniverse.com/forum/m_6780047/tm.htm

Interesting information to know for Heli pilots and CCPM configurations regarding the servo order

Andy

01-18-2008 12:50 AM

DKflyer
Senior Heliman
Location: Huntington, WV

Quote
2. I was also told that the 14 channel receiver is THE ONLY receiver that has 2048 resolution.

I have seen where Futaba has said that the 8 channel receiver is also 2048 resolution. I ordered one because of this. Now I don't know what to think. I'm beginning to loose all confidence in anything they say.

01-18-2008 01:05 AM

Amarjit
Senior Heliman
Location: Chicago, IL

So, in the actual feature list of the 12FGH, it clearly states Servo Grouping Sync.

Hey everyone,

In the features list of the 12fgh , it clearly states that it allows for servo grouping:

Programming Features:
Thirty model memory
Programming for airplane, glider and helicopter models
Supports 13 wing types, 3 tail types and 8 heli swash tupes
Eight flight conditions
Variable dual rates
Servo grouping for servo synchronization
Newly designed "joystick" button and Dial-N-Key editing for

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXRUB9

My question is how do I access this, and why is it that Futaba support hasnt a clue as to how to help me...

Andy

01-18-2008 01:43 AM

helo_chris
Veteran
Location: goodlettsville, tn

Judging from the information in the above referenced post it looks like its a function of the Rx, not the Tx. Pretty disappointing from a $1K Tx. Glad now I decided on a different Tx.

"There is a fine line between cutting edge and bleeding edge.."

01-18-2008 01:47 AM

HOMEPAGE

JKos
Elite Veteran
Location: Town of California in the state of Maryland

From watching the output of the R617FS rx channels 1, 2, and 4 on a logic analyzer, they do indeed get updated together. They are not simultaneous pulses like on a G3 and R6014FS rxs, but they do appear to get updated in the same frame. This is on a 12Z with the TM-14.

- John

Protos -- Logo 14 -- Logo 10

01-18-2008 03:49 AM

Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

Channel assignment

John:

Why would futaba change the grouping in the 7 ch Rx?
I know for shure that my gov channale would not work on ch 5, i had to reassing it to ch 7. So it was common sense to carry on the grouping from the 14ch Rx.

Can you check the grouping on all 7 ch of the R617FS?

01-18-2008 06:41 AM

HOMEPAGE

JKos
Elite Veteran
Location: Town of California in the state of Maryland

> Why would futaba change the grouping in the 7 ch Rx?

No idea.

> Can you check the grouping on all 7 ch of the R617FS?

Will do.

- John

Protos -- Logo 14 -- Logo 10

01-18-2008 07:08 AM

Amarjit
Senior Heliman
Location: Chicago, IL

Grouping

John,

I have attached my CCPM servos on channels 1,6, and 2. I am still experiencing the same issue with one servo apparently lagging behind the others to produce an uneven swashplate movement when rapidly accelerating the pitch upwards or downwards.

Do you think that I have to use a different receiver?

Thanks so much
Andy K

01-18-2008 11:52 AM

JKos
Elite Veteran
Location: Town of California in the state of Maryland

Andy,
I only have the 12Z and 7C to test this with right now, no 12FG. For the 617, what I see is the channel output sequence of

7-6-1-2-3-4-5 with slight overlap between 7 and 6 and then 6 and 1.

With the TM-14 they recommend using channels 1, 2, and 4. Those three channels appear to be updated together. With the 7C you use 1, 2, and 6 by design and those three channels appear to be updated together.

- John

Protos -- Logo 14 -- Logo 10

01-18-2008 01:33 PM

Amarjit
Senior Heliman
Location: Chicago, IL

Thanks

Thanks John

The 12fg and 12z should almost be identical in this setup, but do you recommend that I then setup the CCPM servos in 7,6, and 1 for the 617?

I will give this a shot

Thanks so much
Andy

01-18-2008 01:47 PM

JKos
Elite Veteran
Location: Town of California in the state of Maryland

Andy,
Does the lag follow the servo or the channel the servo is plugged into? I.e., is the same servo always lagging? Or does any of the three servos plugged into channel X lag?

Thanks,
John

Protos -- Logo 14 -- Logo 10

01-18-2008 01:53 PM

Amarjit
Senior Heliman
Location: Chicago, IL

follow up

it appears that it is the same servo that is always lagging. I even replaced the servo with a new one to see if that would make the problem disappear. It unfortunately hasnt

What do you think?

01-18-2008 02:04 PM

Amarjit
Senior Heliman
Location: Chicago, IL

just to clarify

john
the lag is on the channel for some reason.

Andy

01-18-2008 02:09 PM

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Radio - Futaba FASST > Servo sync or grouping on 12fgh 2.4?

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