[NSRCA-discussion] curious

[Dave]

All JR/Spektrum native systems use servo sync to simultaneously update
multiple channels/servos assigned to a specific control.

 

Regards,

 

Dave Lockhart

Team Horizon/JR/Spektrum

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Atwood, Mark
Sent: Monday, March 22, 2010 2:38 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] curious

 

This will end up being somewhat of a shameless plug, but when we were
involved in discussing features of the new Airtronics radio (SD-10G), this
issues of grouping channels was a BIG deal to the glider guys.  They often
have 6 and 8 servos in their wing alone, and having a small delay between
some of the channels updating creates trimming issues such that they would
not be able to take advantage of using separate channels if there were
delays.  Having such a strong presence in the glider community, they needed
to address it.  The result is that the new radio updates all 10 channels
simultaneously rather than in groups of 4.   NO clue how that was pulled off
technically (or how they got their speed so high) but both are clearly a
result of these types of "threads" and the resulting priority that they've
placed on latency concerns.

 

It helps that being a little late to the dance afforded them the opportunity
to address those concerns.   

 

I don't think it will be long before latency numbers are all low enough that
it won't be a critical criteria, but for now it's good to see all the
manufacturers taking note and making improvements with each new release.

 

-Mark

 

Mark Atwood

Paragon Consulting, Inc.  |  President

5885 Landerbrook Drive Suite 130, Cleveland Ohio, 44124 

Phone: 440.684.3101 x102  |  Fax: 440.684.3102

mark.atwood at paragon-inc.com  |  www.paragon-inc.com
<http://www.paragon-inc.com/> 

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Richard
Strickland
Sent: Monday, March 22, 2010 10:43 AM
To: NSRCA DISCUSSION
Subject: [NSRCA-discussion] curious

 


 
The original post was in '05 in that link.  He has been updating it as he
gets new info.  It's worth a read--but takes a while.  Some feel the thread
has contributed greatly to latency being decreased in radios across the
board.  As someone pointed out "..radios got pretty damn fast pretty damn
fast..."
Regarding Futaba modules--at least on the TM14, the information is sent in
groups of four, so you would have minimum latency difference for example
between channels 1-4, 5-8, 9-12, etc..  so it would be better to have dual
elevators next to one another and possibly ailerons in one of the 1-4 groups
if your transmitter has the capability to reassign channel positions.  It
would also be helpful to those that have more than one servo per surface.
It's very important to the helo guys as they need the swash plate to move
evenly.  Apparently not quite as noticeable in pattern.
I switched from 50mhz/5114DPS to the 2.4/TM14/6008HS combo and the best one
word description I can give is "silky"--but it could be additional
latency--Futaba says there should be no difference.  I think I like it--but
I have to--it's what I've got! 
 
Richard
 
PS Anyone need any DPS5114s on 50mhz.?..yeah, that's what I thought...

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