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ORIGINAL: CPS

JR new style modulation DMSS.Dose anyone have experienced this new Radio?Thanks for your sharing!

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ORIGINAL: scooterinvegas

Its a "hopper"

DMSS started as an Japan only deal. DMS2 can not be used in Japan, so JR came up with DMSS to replace their DMSJ. Yes I said DMSJ

I think JR is going sell it else where (not in US yet), but I think DMSS will replace DMS2 in the US someday.

I know this doesn't help you at all, sorry.

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ORIGINAL: slarty

>
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But this is a very quick noddy guide and I won't go into any technical detail.

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ORIGINAL: BarracudaHockey

Why is it obsolete? Is it not doing something you expect of it? Its firmware is updateable and its fully supported by JR, I don't understand your statement.

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ORIGINAL: rmh

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ORIGINAL: BarracudaHockey

Why is it obsolete? Is it not doing something you expect of it? Its firmware is updateable and its fully supported by JR, I don't understand your statement.

JR will swap a DSMX to DMSS?


Even If so, why do it ?

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ORIGINAL: Zor

We cannot get better resolution than the servos are capable of resolving no matter what the feeding rate to them is. Advertising higher resolution like 2048 does not change the ability of the servos to deliver. That is just a marketing gimmick as far as I understand.

Any comments posted would be nice to read.

quote:

ORIGINAL: Zor

We cannot get better resolution than the servos are capable of resolving no matter what the feeding rate to them is. Advertising higher resolution like 2048 does not change the ability of the servos to deliver. That is just a marketing gimmick as far as I understand.

Any comments posted would be nice to read.

quote:

A few notes:

1) You're right, you cannot get better resolution than the servos can deliver. However, there are detectable differences between resolutions even with poor servos. For instance, compare the same servo with PCM-512, PCM-1024, and a 2048 system like Spektrum (use a high-end rx and tx to see it). You will see a difference.

2) It's not just a marketing gimmick. High quality servos will show that even more. If you choose to fly crappy servos, then you won't get resolution and your aircraft will fly accordingly.

It's not just the signal to the servo, it's the math leading up to it too.

Andy

2) The math leading up to it is what the advertising is using as a selling argument but the end results have to prove it such that the buyer can realize his money was well spent.

If you can name a servo capable of 2048 or even only 1024 individual rotation I would like to repeat measurment as I did in the past and post pictures AGAIN of the results.

If I have a linkage connected to a servo at 0.500" radius the cicumference is 3.141593 inches.
A full servo rotation of plus and minus 60 degrees (120 deg total) is 1.047198" on the circumference.
That would be divided in 2048 small arcs. Each small arc having a length of 0.000511".
That is cutting a length of  one inch in one thousand parts and again cutting each of these parts in half.
I mention it this way for anyone not familiar with the normal decimal nomenclature.

Now a 1024 resolution system would double this for each servo increment. It would now be 0.001023"
The best I could have with two DS821 (I used two servos to make the measurements) was 0.0030".
That is a resolution of just about 1024 / 3 = 341.33 _ _ _ quite far from 2048.

Please let me know of a servo (brand or manufacturer and type or model) that can move a no slop linkage in small steps of 0.000511".

I am also curious what this represents in terms of time variation of the pulses on the signal wire of the servo.
If I use as limits 1.1 milisecond to 1.9 miliseconds I have 0.80 milisecond. Dividing that timing in 2048 parts I get 0.8 / 2048 = 0.000391 miliseconds or 0.391 microsecond of variation in the pulse timing.

I want to see a potentiometer in the transmitter that will faithfully change the DC voltage so that the ADC converters will digitize the change that in turn will be converted back by DAC to produce this kind of pulse width variation to the servo wires.

Feel free to show where my knowledge or reasoning is wrong.
I am posting it so that you can show where I am not understanding properly.

I think it is too easy for a pilot to be convinced that he sees what he anticipates.
A well known characteristic of the human mind.

Thanks for your feedback.
NOTE: I am not trying to prove anyone wrong; I am only trying to understand the reality of the facts.

Zor

 

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NOTE: I am not trying to prove anyone wrong; I am only trying to understand the reality of the facts.

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ORIGINAL: AndyKunz

quote:

NOTE: I am not trying to prove anyone wrong; I am only trying to understand the reality of the facts.

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AndyKunz
I think you're just being yourself and posting to match your reputation

Of course I am being myself just like you are being yourself as seen in your reply.
I do not accept statements, much less in advetisements, if they do not make sense to me or if I cannot intelligently figure them out.

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AndyKunz
This thread is about "Experience of JR DMSS" - please stop trying to hijack it.

You are saying "please stop trying to hijack it" because you you have not found any faults in my reasoning.
You have not and likely cannot show a servo that can resolve 2048 individual rotary motions.
So what is the point of having 2048 mathematical resolution (easy to do in digital manipulations) if it ends up with barely a few hundreds.

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AndyKunz
Remember this thread: http://www.rcuniverse.com/forum/m_11025890/anchors_11025890/mpage_1/key_/anchor/tm.htm# - there are others like it.

Yes I remember this thread in which a fellow had an antenna that had broken some distance away from the PC board and some fellows suggesting to him to solder a new wire on the PC board when all he had to do is avoid the risk of damaging that board. All he had to do from my suggestion was to solder a wire at the end of the remaining wire and make it the recommmended length.

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AndyKunz
Adios!

Andy

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ORIGINAL: Zor

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ORIGINAL: AndyKunz

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NOTE: I am not trying to prove anyone wrong; I am only trying to understand the reality of the facts.

quote:

AndyKunz
I think you're just being yourself and posting to match your reputation

Of course I am being myself just like you are being yourself as seen in your reply.
I do not accept statements, much less in advetisements, if they do not make sense to me or if I cannot intelligently figure them out.

quote:

AndyKunz
This thread is about ''Experience of JR DMSS'' - please stop trying to hijack it.

You are saying ''please stop trying to hijack it'' because you you have not found any faults in my reasoning.
You have not and likely cannot show a servo that can resolve 2048 individual rotary motions.
So what is the point of having 2048 mathematical resolution (easy to do in digital manipulations) if it ends up with barely a few hundreds.

quote:

AndyKunz
Remember this thread: http://www.rcuniverse.com/forum/m_11025890/anchors_11025890/mpage_1/key_/anchor/tm.htm# - there are others like it.

Yes I remember this thread in which a fellow had an antenna that had broken some distance away from the PC board and some fellows suggesting to him to solder a new wire on the PC board when all he had to do is avoid the risk of damaging that board. All he had to do from my suggestion was to solder a wire at the end of the remaining wire and make it the recommmended length.

quote:

AndyKunz
Adios!

Andy

Adios! _ _ _ _    _ _ _ trying an easy way out ?

Let us leave the readers make their own judgments.
I am only trying to understand the facts and have no reasons to make claims that I cannot explain.

Zor

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ORIGINAL: fizzwater2

speaking as a reader of this thread - which was asking if anyone had experience with DMSS -

It seems as if it has wandered into a technical diatribe on the pros and cons of high resolution - which has NOTHING to do with DMSS per se.