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Old Feb 23, 2013, 10:03 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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Quote:
Originally Posted by MikeRobey42 View Post
I was hoping that someone from HK would confirm the fact that, once a connection is made, the model cannot connect to another radio. To me that means its safe to use them.
If two transmitters have the same ID, the receiver will listen to both of them.

Andy
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Old Feb 23, 2013, 10:14 AM
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Rich in ILM's Avatar
USA, NC, Wilmington
Joined Sep 2010
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Quote:
Originally Posted by AndyKunz View Post
If two transmitters have the same ID, the receiver will listen to both of them.

Andy

And the ods are?
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Old Feb 23, 2013, 10:20 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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Impossible to determine due to HK's silence, but based on the ID's that have published online, extremely high and therefore not worth the risk IMHO.

Andy
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Old Feb 23, 2013, 11:12 AM
Retired in NC
Rich in ILM's Avatar
USA, NC, Wilmington
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Quote:
Originally Posted by AndyKunz View Post
Impossible to determine due to HK's silence, but based on the ID's that have published online, extremely high and therefore not worth the risk IMHO.

Andy
"Impossible to determine" or "extremely high"?
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Old Feb 23, 2013, 11:43 AM
AndyKunz's Avatar
Illinois
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Impossible to provide a number (I'm an engineer, remember) due to their lack of forthrightness. The range of IDs published on the web (not facts from their engineers, just user-published data which may not be as reliable) indicate a very small set of IDs and therefore an extremely high probability of collision and therefore high risk.

Andy
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Old Feb 23, 2013, 01:57 PM
wjs
William
United States, MI, Brighton
Joined Oct 2012
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Quote:
Originally Posted by AndyKunz View Post
Impossible to provide a number (I'm an engineer, remember) due to their lack of forthrightness. The range of IDs published on the web (not facts from their engineers, just user-published data which may not be as reliable) indicate a very small set of IDs and therefore an extremely high probability of collision and therefore high risk.

Andy
It would seem easy enouph to run a ticket system incremented by 1 during manufacture and avoid all collisions. At least inside their domain. Is this somehow more difficult to do during mfg then using a small generated list? Confused as to why they seem to have created their own problem.
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Old Feb 23, 2013, 02:06 PM
AndyKunz's Avatar
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So are we, but that's OK with me - it's THEIR problem!

Andy
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Old Feb 23, 2013, 04:35 PM
No bounce, No play.
davidmc36's Avatar
Canada, ON, Ottawa
Joined Oct 2010
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Quote:
Originally Posted by AndyKunz View Post
So are we, but that's OK with me - it's THEIR problem!

Andy
The worrisome thing is that it could be "our" (users) problem if people are running around in public with these.

Still waiting to hear from somebody doing exhaustive tests in DSMX.
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Old Feb 23, 2013, 04:55 PM
AndyKunz's Avatar
Illinois
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DSMX would imply genuine receivers being used with imitation transmitter module. How much sense does that make?!?!

Andy
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Old Feb 23, 2013, 04:56 PM
Who let the dogs out?
phil_g's Avatar
Pontefract, Yorkshire, UK
Joined Jul 2007
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Quote:
Originally Posted by phil_g View Post
I've just been on the OrangeRx website and posted a query on their support page ... Not sure if they'll respond, we'll see.
Nope (as expected) they deleted it without comment.
Cheers
Phil
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Old Feb 24, 2013, 04:50 AM
Mark Harrison
USA, CA, Piedmont
Joined Jun 2010
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Quote:
Originally Posted by AndyKunz View Post
Impossible to provide a number (I'm an engineer, remember) due to their lack of forthrightness. The range of IDs published on the web (not facts from their engineers, just user-published data which may not be as reliable) indicate a very small set of IDs and therefore an extremely high probability of collision and therefore high risk.

Andy
Andy, do you have a web page reference for the ID range?

I'm similarly confused as wsj, as to why they would repeat IDs inside their domain.

Is there a "manufacturer domain", or is there just a single range of IDs?
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Old Feb 24, 2013, 05:33 AM
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United States, CA, Sacramento
Joined Aug 2011
601 Posts
It sounds like Orange has a weakness in their DSMX implementation. I expect they're working on addressing it but frankly, I would be just as happy with the Orange Tx module if it didn't try to do DSMX at all. I suspect most of the purchasers aren't even using DSMX.

For a small number of users that care about DSMX, this might be an issue to consider. However for people like me who do not fly simultaneously with many dozens or hundreds of other flyers, there may not be a justification for DSMX. I'm not flying $500 models and I'm not flying extreme distances (though DSMX doesn't claim to increase max distance anyway). So far, the Orange Tx module has worked flawlessly in my 9x which lets me easily remap channels to match BnF planes. In non-BnF planes I'm using DSM2-compatible receivers ($9 delivered) and have no lost packets even when flying to the edge of visual range in any orientation including intentionally blocking the Tx with my body, pointing the antenna directly at the plane etc. During excessively harsh range testing I have yet to be able to force the loss of even one packet (much less even momentary loss of control).

Spektrum/Horizon makes great gear, however for my particular applications DSMX exceeds my requirements. Not to worry though, that just frees up a bit more cash for Horizon to snag with some planes and other gear. In fact, that was the primary reason for getting the Orange module, so I could buy Horizon BnF planes. Otherwise I would have just stuck with my FlySky module and kept buying more FlySky Rxs.
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Old Feb 24, 2013, 06:03 AM
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Deutschland, Hessen, LA
Joined Jan 2009
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The orange weakness in there DSMX implementation is that the not know how DSMX is implemented. The Orange can copy chips but the don't know the logic behind. The got cloned only orginal Spektrum DSMX modules.
Therefore only a limited ID space for the orange DSMX avaible.
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Old Feb 24, 2013, 11:10 AM
Taranis Tyro...
MattyB's Avatar
United Kingdom, England, Hitchin
Joined Jan 2004
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Quote:
Originally Posted by Kambalunga View Post
The orange weakness in there DSMX implementation is that the not know how DSMX is implemented. The Chinamen can copy chips but he don't know the logic behind. The got cloned only orginal Spektrum DSMX modules.
Therefore only a limited ID space for the orange DSMX avaible.
Probably true when the module was originally released, but there is nothing to stop them addressing the issue retrospectively with a v2; DSMX was cracked and the code placed in the public domain some months ago. From earlier in the thread...
Quote:
Originally Posted by Geoff_S View Post
The DSMX hopping sequence looks like it has cracked, based on some posts from a Russian fellow in the RCGroups DIY Electronics forum. The same fellow also made a comment suggesting the Orange tx only has ten hard-coded GUID's

=======
Edit: added link to post: http://www.rcgroups.com/forums/showp...&postcount=120
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Last edited by MattyB; Feb 24, 2013 at 11:23 AM.
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Old Feb 24, 2013, 11:33 AM
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Deutschland, Hessen, LA
Joined Jan 2009
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But the problem with this russian code it work only within a range of 5m at full power.
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Last edited by Kambalunga; Feb 24, 2013 at 11:44 AM.
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