[NSRCA-discussion] curious

Mon Mar 22 14:10:05 AKDT 2010

Futaba calls it 'Grouping'--but I'm not sure how the 1-4 signal works into that.  Possibly if you've 'grouped' say channel 1 and 6, one is the master and the second(6) syncs up with that and the signal that would normally drive the second is ignored.  It all seems to work pretty well.  Obviously, I could stand to do a little more research on the subject...

RS

From: DaveL322 at comcast.net
To: nsrca-discussion at lists.nsrca.org
Date: Mon, 22 Mar 2010 15:26:34 -0400
Subject: Re: [NSRCA-discussion] curious

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

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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