RunRyder - TX/RX eCCPM Output Test Results

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Radio - Servo - Gyro - Gov - Batt > TX/RX eCCPM Output Test Results

SP4772
Senior Heliman
Location: Mirabel, Québec, Canada

So what is the next step if the Futaba 9C Super do not work like it should? I thought i had a good tx...well, i'll look for DX7 or JR then.

WWJD??

12-22-2007 12:00 AM

PietervA
Veteran
Location: New Zealand

EDIT

12-22-2007 12:57 AM

RCSoar
New Heliman
Location: UK

Encoding differences between PCM-G3 and 2.4 GHz

Well I've been looking at the latency posts with great interest, and marvelling at John K's most valuable work in this area. Thanks John, this has been of great interest.

I'd be grateful for some guidance on a related issue. This is to do with the encoding scheme used in Futaba's PCM-G3 and 2.4 GHz transmission modes. This relates specifically to the 12FG but the same would apply to the 12Z and 14MZ.

Am I right in thinking that both the PCM-G3 and 2.4 GHz transmission modes actually share the same 'G3' encoding scheme? In which case the only differences are the way the data stream is transmitted (narrowband FM v. spread spectrum). Am I correct in this assumption?

In the UK the TM-14 module isn't available and there isn't any documentation which I could find on this.

Thanks in advance.
Mike Shellim
RC-SOAR.COM

01-07-2008 01:27 AM

DS 8717
rrProfessor
Location: Here wishing i was somewhere else

Quote
So what is the next step if the Futaba 9C Super do not work like it should? I thought i had a good tx...well, i'll look for DX7 or JR then. Alea Jacta Est...

The 9c is Futaba's "Edsel"

01-07-2008 12:00 PM

GimbalFan
Elite Veteran
Location: Copter County, Nv

As a die-hard Airtronics fan, I'm looking forward to see how their 2.4gHz module/rx for the Stylus performs when it's released later this year.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t

01-07-2008 12:27 PM

Dr.Ben
Elite Veteran
Location: Richmond, VA, USA

Nah.

Not an Edsel.

Edsels didn't sell. Futaba has sold a blue million 9C's.

More like a Taurus.

Not the fastest car on the block, but it gets the job done for a great many pilots.

Ben Minor

01-07-2008 02:31 PM

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

Just thought I would update this thread by saying...

12Z with TM-14 has excellent CCPM. Fully sync'd and simultaneous swash channel output pulses.

X9303 has excellent CCPM. Fully sync'd.

- John

MSH Protos

01-17-2008 02:38 AM

GimbalFan
Elite Veteran
Location: Copter County, Nv

To save a long re-read, do you recall whether the Stylus' pulses are sync'd?

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t

01-17-2008 02:49 AM

TMoore
rrProfessor
Location: Cookeville, TN

They are not.

TM

Buying tools is half of the equation, knowing how to use them is the other. - T Moore

01-17-2008 03:10 AM

HOMEPAGE

GimbalFan
Elite Veteran
Location: Copter County, Nv

Awww... well that does it.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t

01-17-2008 03:12 AM

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

Hey now... For whatever reason, despite not having fully sync'd pulses, the Stylus has excellent CCPM. Here is plot of the rx output during a fast collective change. I believe it is because the CCPM mixing is excellent and the channels can fully change in one frame.

- John

MSH Protos

01-17-2008 03:21 AM

GimbalFan
Elite Veteran
Location: Copter County, Nv

Ahhh... that's better.

op-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-thwõp-t

01-17-2008 03:26 AM

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

The Futaba T7C 2.4 GHz with an R617FS has great CCPM characteristics. The three channels have sequential pulses (6, 1, then 2) with some slight overlap of 6 and 1 depending on the pulse width. Those three channels appear to stay sync'd.

The channel output scheme of the R617FS is 7-6-1-2-3-4-5.

Oh, and good news too, is that there is no sign of "slew rate limiting" as noted previously on the 6EX 2.4, 7C, and 9C Super.

- John

MSH Protos

01-18-2008 07:09 AM

Ace Dude
Elite Veteran
Location: USA

I'm looking forward to seeing how the R608FS compares to the R6014FS when the R608 becomes available for testing.

01-18-2008 04:25 PM

Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

Grouping

John:

I really dont understand 7-6-1-2-3-4-5.
Do you mean 7-612-345 ??????? Or what?
Felipe

01-18-2008 04:54 PM

HOMEPAGE

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

> I really dont understand 7-6-1-2-3-4-5.
> Do you mean 7-612-345 ??????? Or what?

No, sorry, that is not the grouping data wise, but rather the pulse output sequence from the receiver.

- John

MSH Protos

01-18-2008 05:16 PM

Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

John:
Are you reading this pulses from the Data Port or the channels themselves?
Felipe

01-18-2008 07:12 PM

HOMEPAGE

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

The rx servo output pins.

- John

MSH Protos

01-18-2008 07:42 PM

AAKEE
Senior Heliman
Location: Boden, Sweden

JKos ---> do you have a picture of the Dx7 caracteristics ?

I just found 'god behaviour' in a post.

01-23-2008 12:17 PM

DKflyer
Senior Heliman
Location: Huntington, WV

John,

Any word yet on the 8 channel FASST receiver? Will it have the same characteristics at the 14 channel?

Thanks,

DK

01-23-2008 05:02 PM

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