AR7600: 1024 Vs 2048 ??? 11ms Frame rate???

[CookieMan]

Hi ya'll

Ok as far as my understanding goes the Spektrum DX7se, JR X9303, and JR 12X are all 2048-step resolution transmitters. The Spektrum DX7se however is the only DSM2 TX currently on the market with an 11 mSec frame rate.

Now I have the JR X9303 (DSX9) and how (if ever possible) would I (in any sense of the word) unleash the potential of the AR7600 receiver?

I'm trying my best not to make it sound like I'm asking a thesis related question on quantum physics!

Cheers guys,

[Mark_T]

Not sure if I'm missing your point, but if you use your JR 2048 resolution TX with any Spektrum RX capable of 2048 resolution then you are as 'unleashed' as you can get.

The AR7600 frame-rate capabilities can only be 'unleashed' with a DX7SE at the moment as far as I know?

[Bruinbear]

Yep !
Mark has about summed it up.

[PsiLo]

Easy, buy a DX7se

With the DSX9 you will benefit from the 2048 resolution but obviously not the faster frame rates, the DSX9 is 22ms I seem to recall?!

[CookieMan]

Ok... a little bit diversion here then,

a) What does the 11ms frame rate of the receiver do?
-- How does that give the DX7SE an added advantage over the other radios (which I'm guessing there must be..)

b) How exactly does this RESOLUTION and FRAME RATE thing work... on what basis or concepts?

c) What am I missing if the resolution of the receiver matches to that of my radio but not the Frame Rate?

Thank you mates, for the prompt response...

[Mark_T]

Frame rate is how often data is sent, resolution is how precise the positions of the servos can be commanded.

So you do need good servos as well as the TX/RX combination.

Quite a bit of debate about just how useful the higher resolution actually works out to be once you take all the components into consideration, including the accuracy of your thumbs

[barney]

easy, the 11ms refers to the speed the radio to rx responds

brian

[lex7919]

Jason sorry mate i think i may be cause of some confussion here, i completely forgot you got the JR radio

So yeah your resolution is good to go maxed out... enjoy

Try to keep this simple as possible, resolution ok imagine a stair case 100ft high if i said to you the steps have a 1024 resolution that means there are 1024 steps from bottom to top- 1024 resolution

I asked you to go stand exactly 36.5% of the way up the steps from the bottom. But whenyou got close you turn and say "i can't all i can stand on is this step at 36% of the way up and the next one which is 37% of the way up"

Come back down the stairs (feels like the show come on down lol )

I say heres stair case number 2 still 100FT high but with 2048 steps ie resolution now go stand 36.5% the way up this one you get to 36% and now theres another step between it and 37% Bingo 36.5% of the way up the stairs.

That stair case is your servo and its travel arc, or therefore the amount of controll you have over that travel arc. Precision is what it gives you.


Frame rate is to do with the signal to the servo or how fast it receives that signal to extract the maximum precision and resolution you need as high a frame rate as possible. So if the servo need to move that .5% then its gets the signal as fast as possible to move then it can be considered more accurate.
In the real world though will you feel the difference not very likely! unless you have some great servos-zero slop- Zero interactions in short the perfect set up! how many have this?

So in short take advantage of the resolution if you can but dont worry over the frame rate to much, imho resolution will be felt way before any nano second will.

Hope you kinda understand a bit better now if you dont that was a complete waste of time
Jesting

Ok... a little bit diversion here then,

a) What does the 11ms frame rate of the receiver do?
-- How does that give the DX7SE an added advantage over the other radios (which I'm guessing there must be..)

b) How exactly does this RESOLUTION and FRAME RATE thing work... on what basis or concepts?

c) What am I missing if the resolution of the receiver matches to that of my radio but not the Frame Rate?

Thank you mates, for the prompt response...

[Mark_T]

Just to add to the confusion, latency and frame-rate are not the same thing but are related.

Frame-rate determines how often the TX sends position information to the RX, latency however is the time it takes the TX to change what it is sending based on your inputs and get that out to the RX.

The processor in the radio can't always get the changes converted and ready to send by the time the next frame is ready to go as you may have made the change just before the frame is due to be sent so the very best the DX7SE is going to achieve is a latency of between 11-22ms as long as the processor is up to the task (and it does seem to be based on tests elsewhere).

[CookieMan]

Try to keep this simple as possible, resolution ok imagine a stair case 100ft high if i said to you the steps have a 1024 resolution that means there are 1024 steps from bottom to top- 1024 resolution
....
Hope you kinda understand a bit better now if you dont that was a complete waste of time
Jesting

Crystal clear now Alex... thanks to the 'stairs'.. good one mate..
Thank you Mark and Brian.. I think i understand the concept much better now..

Cheers guys,
(What would I ever do without you all!!!)

[lex7919]

Cheers guys,
(What would I ever do without you all!!!)

Be much more confused

[msssltd]

Frame rate is to do with the signal to the servo or how fast it receives that signal to extract the maximum precision and resolution you need as high a frame rate as possible.

Oddly I was looking at these two radios yesterdays, from a geeky interest rather than an actual need. Manufacturers superlative claims aside, I came to the conclusion that the JR DSX9 was better due to having 7 point curves opposed to the DX7 5 point.

I may be showing my ignorance as my digital transmission knowledge comes from working with telephone and computer networks. I may be missing something (and would appreciate an explanation), but as far as I can see;

• Speed is bound by the mechanics of the servo.
• Precision is bound by the resolution of the stick pot and the number of bits used to encode the position.

I would have thought the transmission bottle neck is the speed the servo moves. From the little I have read, servo movement appears to be measured in 100s of ms, which is an order of magnitude(ish) slower than the frame rate measured in 10s of ms. If that is the case, I would expect doubling the frame rate to increase the reliability (redundancy), rather than speed of response.

[Mark_T]

You may be missing the fact that the quoted servo speed figures are usually for a 60 degree movement, when making small changes they will be a lot faster.

[Swashbuckler]

Oddly I was looking at these two radios yesterdays, from a geeky interest rather than an actual need. Manufacturers superlative claims aside, I came to the conclusion that the JR DSX9 was better due to having 7 point curves opposed to the DX7 5 point

I have both these radios and find that the DSX9 is more precise and has a much better and more comprehensive range of features and mixes, however the throws on the sticks are huge which makes it difficult to do 3d with. I would use the dsx9 for smooth aerobatics, scale, f3c, etc. I only now use the dsx9 for my planks when i'm in PSOG mode.

The dx7se is IMHO the current best 3d heli tx, I would love to try the dsx12 though.

So i would say it depends on what flying you are doing as to which tx is actually better.