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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsSkookum › 720 and DSMX Info?????
05-12-2011 10:57 PM  8 years ago
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doorman

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Sherwood, Arkansas

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720 and DSMX Info?????
Wondering if anyone has used the 720 with the new DSMX satelites yet??? There was a question as to if they would be compatable..

Thanks for any info.... Stan
AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft
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05-12-2011 11:01 PM  8 years ago
Ben-T-Spindle

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Central Illinois

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I have read that will be in the next firmware update.... BTS
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05-12-2011 11:17 PM  8 years ago
Ben-T-Spindle

rrProfessor

Central Illinois

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More information at HF. Apparently it will sort of work with current firmware.
http://www.helifreak.com/showthread.php?t=303861

... BTS
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05-13-2011 01:19 AM  8 years ago
GetToDaChopper

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Las Vegas , NV

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Posts from Skookum....
Just to throw it out there, we have done automated testing of our DSM2 bug detection (tens of thousands of power cycles with a test rig), and it seems spektrum's 2048-resolution DSM2 problem occurs randomly in around 1 in 300 power cycles. So if you want to save a bit of money, you could wait for the next SK720 update instead of buying DSMX gear.

linksmechanic>"If it happens 1 in every 300 power cycles Why haven't I crashed my my Hangar 9 beast or my P.A. extra mx or my trex 250? I have powered on the units at least 500 times in 2 years."

It occurs *randomly* between 1 in 200 and 1 in 400 boot ups, depending on the severity. Try flipping a coin a few times; notice it doesn't alternate head/tail/head/tail. Basic stats says some people will get to 1000 boots without a problem, and some to just 50.

Also, it does vary in severity. I'm giving away some hard work here, but to clarify: For 11ms and >7 channel radios, the full channel set is spread across two frames, call them A and B. Normally, they go ABABABABAB. Most of the time the bug shows as something like AAAABBBBAAAABBBB, and less often it shows as AAAAAAAAAAAAB. If you're a tame flyer you might not even notice more than a bit of stuttering with the first version of the problem. A hot flyer might mis-time maneuvers and crash.

>So why does this error only happen with the sk720 and not jr/spektrum/horizon receivers?

(1) It doesn't, and (2) it does. The problem was originally found by [a] Vbar [flyer]. In fact I first isolated it myself by looking at the raw data from a sat rx with a logic analyzer - no SK720 required, just several hours of looking for weirdness. Once initially bound, the SK720 just receives the data, and nothing is sent to the sat rx. You can be sure it also happens with native spektrum rx's, because you can bind it with one and then find the issue (eventually) with a single sat rx and a 3.3v supply.

How many people make it to 300 flights without something else failing, or dumb thumbs? This issue probably got lost in the background hail of falling RC aircraft. It may also be that *direct* servo motion "looks weird" with a bad bind, and people often notice, and just shrug and reset their radio.

>I spoke with an engineer(an independant contractor for horizon) that designs the circuit boards for horizon(family member) and he is a little stunned by what He is hearing here.

It isn't a problem with their hardware. It's pretty obviously a firmware bug. All software has bugs in it, no matter who writes it, no matter how big the company behind it, no matter how much they test it. It's actually impossible even in principle to be sure a non-trivial piece of software is completely bug-free (the Halting Problem).
hope that helps
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05-13-2011 11:07 AM  8 years ago
Ben-T-Spindle

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Central Illinois

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The problem with Skookum is that they are very-very slow and it takes a year or more to get an update out so it may be late this year or next year before we see an update.

... BTS
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05-14-2011 03:27 AM  8 years ago
craigd

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Sydney Australia

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I would have to disagree with that statement.

I had an issue with channel assignment on my MX22 and the SK720,
I emailed Art at Skookum and he wrote an update for my units.

It took him about 10 days, I got and email from him advising me where to get the updates, I down loaded them up dated my firmware and have not looked back since.

Superb customer service from them and all done in a timely manner.

I now fly 3 SK720's all without issue and I know Art and his team will back their product 100%....Credit where credit is due.

Kind Regards, Craig Dyer.
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05-14-2011 04:28 AM  8 years ago
GetToDaChopper

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Las Vegas , NV

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i'd say the update is prob about a week or two away but don't quote me, when you see all they have done with this next update i think you will believe it was worth the wait, the data viewer is a awsome tool !

i have to agree with craigd on this as skookums sevice thas been top notch in my book !

and as of the next update the 720 will be DSMX hirez ready.
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