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Esprit Model . Thunder Power RC . Real Raptors

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Radio - Futaba FASST > Servo sync or grouping on 12fgh 2.4?
 
 
Flying Tivo
Veteran
Location: Monterrey,NL,Mexico

Acceleration

Andy:
Dont know if the 12FG has the acceleration feature. Please check that they are equal on all this channels you are looking into.

Felipe
01-18-2008 04:43 PM
HOMEPAGE  
 
 
Amarjit
Senior Heliman
Location: Chicago, IL

Thanks for your response.

i have the acceleration feature disabled on my system for both the throttle and the pitch.

Not sure what else it may be . I have also connected the servos to 1,2,4 with no change

Andy
01-18-2008 04:51 PM
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

I have made some further observations on the updating of the channels when using an R617FS rx. Just as we are told by the TM-14 instruction sheet, channels 1-4 are a group and channels 5-7 are a group (yes, it says 5-8 but this is a 7-ch rx). No surprise there. But, what I observed is that due to the asynchronous nature of the system, it is possible for either a) all the channels to be updated from one rx output frame to the next, b) channels 1-4 to lead by one frame, or c) channels 5-7 to lead by one frame.

Below are logic analyzer screen shots showing each of these scenarios.
All updated between frames:
Channels 1-4 lead:
Channels 5-7 lead:

Interestingly, I cannot observe this behaviour when using the R617FS with the 7C 2.4.

- John

Protos -- Logo 10
01-20-2008 03:03 PM
 
 
Vic-rex600
Heliman
Location: San Jose, CA

Jkos,
Was the Tx in FASST 7 CH or FASST MULT, during your tests? On my 12FGH, the servos seem to respond faster in Mult Mode (subjective observation).

Vic
01-20-2008 03:33 PM
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

Vic,
The R617FS only works in FASST 7CH mode. Bottom line is that you definitely want to use channels 1, 2, and 4 as Futaba suggests when using the R617FS with the TM-14. Actually, using channels 1,2 and 3 would be ever so slightly advantageous over 1, 2, and 4 just to avoid the gap between 2 and 4.

- John

Protos -- Logo 10
01-20-2008 03:38 PM
 
 
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Mikado Modellhubschrauber . GrandRC . CanoMod

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