[NSRCA-discussion] SD-10

[Jay Marshall]

A liner, non-digital system such as PPM, has infinite resolution and
therefore the ultimate "smoothness". I agree, however, that you probably
can't "feel" a 1/2048 digital step. I suspect that the major improvements
have been in less latency.

Jay Marshall

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Atwood, Mark
Sent: Monday, August 24, 2009 4:19 PM
To: 'nsrca-discussion at lists.nsrca.org'
Subject: Re: [NSRCA-discussion] SD-10

I'll take a stab, and I'm blind copying Mike Greensheilds (don't feel
comfortable putting his email out on the list) who is the product manager
for ATX here in the states.  He may chime in with additional background. 

My understanding is that when Sanwa was evaluating speed vs resolution,
speed was deemed a much more critical factor.  1024 resolution is already to
the limits of our ability to "feel" any difference where as the
speed/latency was much more noticable.   Cost does come into the equation
such that for a $500 radio, they couldn't do both.   

1024 resolution provides better than 1/10deg at 90 deg of rotation.  That's
less than 1/1000" on a 1" servo wheel. 

The speed on the other hand is just now approaching our limits of "feel".
The faster systems clearly feel more connected and are noticable when flying
Snaps and other rapid input maneuvers and especially flying 3D with the
helis.   

So the choice was to invest in a fast response system with 1024 resolution.


Does anyone know the tolerances of our servo accuracy?  I'd be curious to
know how high a resolution they can accurately replicate.   

Mike?  Any input from the source?

-Mark
--------------------------
Sent from my BlackBerry Wireless Handheld


----- Original Message -----
From: nsrca-discussion-bounces at lists.nsrca.org
<nsrca-discussion-bounces at lists.nsrca.org>
To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
Sent: Mon Aug 24 15:30:03 2009
Subject: [NSRCA-discussion] SD-10

Hi Anthony, Jim, Mark , and Others who Responded,

 

Thanks for your valuable input. I've read that this radio's resolution is or
is among the very  fastest; so much so that even digital servos can't keep
up with it. I understand  that the system is 1024 , but can't help but
wonder why it isn't 2048. I'm sure I'll get past my  hangup, but would
appreciate everyone's insight's on that one.

 

Thanks,

Frank Imbriaco

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