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HelicopterRadio - Spektrum DSM › Spektrum and Futaba voltage info from John Adams
09-01-2009 02:26 PM  8 years agoPost 41
TMoore

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Cookeville, TN

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Cycling power is exactly the same as a brown out. Once the voltage falls below a specific level,
the IC's/ CPU's/ Voltage regulator circuits won't work at all below a given voltage, it might as well have no voltage at all.
These devices will not turn "on" until a very specific minimum voltage has been reached.]
Merriam Webster doesn't appear to agree with you concerning the definition of a "brownout". That is: 'a period of reduced voltage caused especially by high demand'. There is nothing in that definition where it says anything about power shutting off. Not every receiver and servo set in the world is limited to the 3.0 voltage lower limit that Spektrum and Futaba appear to use.

TM

Delayed Response Operator Not Engaged

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09-01-2009 02:42 PM  8 years agoPost 42
alfred

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Australia, New South Wales, Mid North Coast

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Not every receiver and servo set in the world is limited to the 3.0 voltage lower limit that Spektrum and Futaba appear to use.
Sorry
Aren't we talking about Futaba and Spectrum receivers using Spread Spectrum technology?
I don't think that a broad definition about a word is appropriate here.

Have a look at "Schmidt Trigger" you will find that it's explanation is roughly that it requires to cross a certain minimum threshold before it changes state.
As an example it could be used as an oscillator for the clock signal of the CPU/digital chips within those receivers.
Without a clock signal, these just won't work.

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09-01-2009 04:49 PM  8 years agoPost 43
cbflys

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Nesconset, NY - USA

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I think you're looking at the letter instead of the intent here ...

Electronics specifications are there to let you (the user) know the "recommended" and "minimum" voltages the devices will work with. It is up to the user to ensure the installation (and application) of the device keeps that voltage within range. The periphial devices (servos, gyros, etc.) have their own specifications which must be taken into account in the overall application.

Spektrum developed QuickConnect to allow their receivers to recover faster (than they origianally did) should the voltage fall below the minimum, AND provide a visual indication that the event occured - hopefully saving the model AND alerting the user that there's a situation that needs attention. Whether it's technically called a "brown-out" or not is inconsequential. There are also physical conditions that will cause devices to fail (high/low temps, humidity, vibration, etc). Again, it's up to the user to make sure they are operating the device within its designed limitations. If the devices fail WITHIN their specified operational margins - than there really is a problem that the manufacturer needs to address.

People make mistakes; installations aren't always robust, connectors fail, etc. Having equipment that provides a "safety net" to recover from and "feedback" indicating that something went wrong is never a bad thing. You can argue all you want about how it's the user's fault that the condition happened in the first place. But, that's not going to change the fact that what Spektrum did was a good thing.

The same holds true with a manufacturer's implementation of Spread Spectrum itself. Whether it holds on to n channels, hops, or is a hybrid of both is a design decision. The specification states the system must tolerate interference - so interference is expected, and the system must deal with it. In the R/C world, that hopefully means that we continue to have or regain control in a very short period of time. They would not get certification if they didn't work. I haven't uncovered any disturbing behaviors with any of the major players implementation of Spread Spectrum that would cause me to advise against using it.

As an independent reviewer - I hold no loyalty to any given system. I evaluate based on the manufacturer's claims, and verify they are indeed true. For an R/C system - performance (resolution & latency), reliability, and programming are key attributes. How much of those you get at a given cost point is what usually drives one to purchase one system over another. Commonality (what everyone else is using) may also be a factor for someone just getting into the hobby. And there's always brand loyality and those who need to have the best available. But I think a product should stand on its own merit - not whether it is better than the competition.

Consumers are getting smarter, so manufacturers who make false claims aren't usually around very long. Fortuately, if a system has an overt flaw - then that will usually surface in forums such as this. We just need to be able to sift through the disgruntled people who are just pissed that their equipment isn't perfect - or - get their rocks off by putting the 'other' brands down.

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09-02-2009 03:45 PM  8 years agoPost 44
radimani

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Japan

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My post is off from the main stream of this thread but ..
How was the situation at IRCHA Jamboree of this year? How many pilots experienced the brown out? How many experienced the radio issue?

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09-03-2009 02:50 AM  8 years agoPost 45
jadams

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East coast USA

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GOOD QUESTION ^^^

Just to be clear I an NOT from Horizon hobby, although sometimes I wish I was. I posted this BC I thought it was interesting. I have had several team pilots tell me about issues with Spektrum "locking out" I personally have not had an issue with my 9303. What I find interesting is that if you search Futaba Fasst, I did not find any reports of "lockout" or "brown out". I really like JR but grew up on Futaba, I bought the 9303 over the 12Z because it was half the price with similar features.
My friend did have a issue with his 500 not connecting at power up. He had to rebind the receiver, it was fine 8 hours prior.

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09-03-2009 10:50 AM  8 years agoPost 46
DS 8717

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You didnt do enough research on Futaba,there was an issue with some of their recievers that were cutting out when they reached a certian temperature.Futaba has not exactly been perfect either,but look at the ratio of units out compared to spectrum,i dont think we have one single Futaba system at our field, well maby one.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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09-03-2009 11:11 AM  8 years agoPost 47
alfred

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Australia, New South Wales, Mid North Coast

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They both are excellent systems and both had their birthing pains.
I don't think that any of the two are better then the other.
just different philosophies and different options.
It depends on the User's taste which option he/she prefers.

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09-03-2009 12:32 PM  8 years agoPost 48
jadams

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East coast USA

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I did and knew about the temp issue. I could not find any reported brown out or lock out issues as posted repeatedly in the spektrum forum.

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09-03-2009 12:37 PM  8 years agoPost 49
alfred

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Australia, New South Wales, Mid North Coast

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I did and knew about the temp issue. I could not find any reported brown out or lock out issues as posted repeatedly in the spektrum forum.
True
They just locked out completely and crashed

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09-03-2009 02:47 PM  8 years agoPost 50
DS 8717

rrProfessor

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I did and knew about the temp issue. I could not find any reported brown out or lock out issues as posted repeatedly in the spektrum forum.

The other jadams
You can pretty much take half of what is said on these forums as BS.99% of the "REPORTED" browm outs are user induced.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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09-04-2009 03:33 AM  8 years agoPost 51
jadams

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East coast USA

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very true, I have not had an issue and take the time to mount and wire my electronics in my heli's correctly. Then I use a large, 2s2p 5000mah lipo to power it.

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HelicopterRadio - Spektrum DSM › Spektrum and Futaba voltage info from John Adams
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