[NSRCA-discussion] Plettenberg 30-10 evo and Jeti ESC

[Bob Richards]

I read a thread somewhere about the S.Bus updating at 7ms intervals. Can't seem to put my mouse pointer on it right now, though..  :-)
 
Bob R.


--- On Mon, 3/19/12, Robert Green <robcase1 at cox.net> wrote:


From: Robert Green <robcase1 at cox.net>
Subject: Re: [NSRCA-discussion] Plettenberg 30-10 evo and Jeti ESC
To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org>
Date: Monday, March 19, 2012, 10:46 PM


Still nothing yet from Futaba, will keep you posted

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of James Oddino
Sent: Monday, March 19, 2012 8:22 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Plettenberg 30-10 evo and Jeti ESC

Hi John, here is what I thought I knew:
1) The initial Futaba 2.4MHz 14Mz systems had a rep rate of about 66 frames
per second (15 millisecond period).  
2) With no changes to the transmitter, the 6008HS receiver had a frame rate
of about 140 frames per second (7 millisecond period).
3) Therefore I assumed the transmitter always transmitted at the higher rate
and the receiver decoder decided what data to use.

Now I'm not sure of anything.  The transmitted rep rate and the receiver
output rep rate to the servos may be completely different.  The transmitted
rep rate might be 300 frames per second or 50 and they may save all the data
in the receiver and send it to the servos every 7 msec (some old data?) in
some receivers and every 15 or 20 msec in others.  I would like to think the
S.bus would send new data to the servos every 3 msec (PWM servos probably
couldn't handle that but servos with a digital interface could).  It would
be nice to talk to someone who knew how it  all worked.

I suspect the S.bus decoder puts out a pulse every 15 msec but I could be
wrong.  In any case I think we know the ESCs will work with 15 msecs so they
should work with the 7008SB as is.  I can't see how the receiver could be
causing the problem as it was described.  What does Futaba say Robert?

Jim O


On Mar 19, 2012, at 12:55 PM, John Gayer wrote:

> Jim,
> I'm confused. Isn't the HighSpeed mode related to a higher frame(rep)
rate? I was assuming when you use the SafeBus you do get high speed, just
not on the standalone channels. The numbers that Earl reported earlier
indicate that the throttle channel used on the 7008SB was updating at 1/2
the rate of the 6008HS.
> There is a decoder for SafeBus channels that might give you a HS
standalone channel. That might be the only way to get the 18MZ receiver to
work for the Jeti.
> John
> 
> On 3/19/2012 1:24 PM, James Oddino wrote:
>> From what has been reported the ESC should run on a high speed channel
and the 7008SB doesn't have a high speed mode so it would appear the problem
is not related to the rep rate.
>> 
>> 
> 
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> NSRCA-discussion at lists.nsrca.org
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