Transmitter Dual Rates, Exponential Theory

[rcdude07]

Here's 2 of 3 parts on Dual Rates and Expo on TXs.

http://www.youtube.com/watch?v=V9vWmRncdws



http://www.youtube.com/watch?v=PoNtTVs9i5M

[jrb]

Is it better to set travel adjustment -- say to 80 w/ DR @ 100 & 125; or use DR @ 80 & 100. w/TA @ 100?

[jrb]

Anybody know?




Is it better to set travel adjustment -- say to 80 w/ DR @ 100 & 125; or use DR @ 80 & 100. w/TA @ 100?

[WJCJR1]

I'll have to chew on this one for a bit, I did not see this question up a couple days back. My first guess is though personal preferences may dictate but I also need to look at the physics a bit as this may easily show the answer. I am new to a lot of the computer radio stuff.

Bryan you have an opinion or answer here.

Wayne

[erkrystof]

I'll have to chew on this one for a bit, I did not see this question up a couple days back. My first guess is though personal preferences may dictate but I also need to look at the physics a bit as this may easily show the answer. I am new to a lot of the computer radio stuff.

Bryan you have an opinion or answer here.

Wayne

Thanks for referencing my videos, very much appreciate it!

If I could lend my opinion as a beginner myself, I would think it does come down to personal preference and with the right settings, you could probably make a 100% TA with 80%/100% DR look just like a 80% TA and 100%/125% DR, but that assumes the TX's DR allows over 100% (mine does) and that it translates the exact same once over the set TA threshold.

I personally mess with Travel Adjust to set my complete and total maximum throw on any channel, that no matter what I don't want it going any higher, and just keep DR to 100% or less, just my personal preference.

Normally I just leave TA at 100% unless I'm having troubles. I too would love to know if there is an advantage beyond personal preference.

Take care, all!

[tkrahlin]

Great job, Eric. Spektrum should send you a check. You have an enviable talent for breaking things down so others can understand them.

Tim

[erkrystof]

Great job, Eric. Spektrum should send you a check. You have an enviable talent for breaking things down so others can understand them.

Tim

Haha, thanks! Appreciate the comments. Hoping to have the d/r expo videos specifically targeting the spektrum tx's soon, 80 hour work weeks wipe me out!

[tkrahlin]

...80 hour work weeks wipe me out!

Teacher?

[erkrystof]

Teacher?

Software Engineer, and these days it seems every project or task is 'top priority'. Just had a few projects deploy this week, so as the deadlines got closer the weeks got longer. Hopefully this week it dies down...

You know it's still denial when every week I say that 'Hopefully this week it dies down'. ::tonguee:

[tkrahlin]

Software Engineer, and these days it seems every project or task is 'top priority'... You know it's still denial when every week I say that 'Hopefully this week it dies down'. ::tonguee:

Yeah, know whatcha mean, but why should you have it any better - LOL!
-- AV guy (7000+ endpoints using SEP11), and WAN/LAN security. "Oh noes!! SHUT DOWN EVERYTHING!"

You do nice work - I hope someday you get the money you deserve ::tonguee: ::tonguee:

Tim

[erkrystof]

Yeah, know whatcha mean, but why should you have it any better - LOL!
-- AV guy (7000+ endpoints using SEP11), and WAN/LAN security. "Oh noes!! SHUT DOWN EVERYTHING!"

You do nice work - I hope someday you get the money you deserve ::tonguee: ::tonguee:

Tim

Haha, yup, you definitely get the idea! :)

Thanks again! I'll post the others in the series on this thread as I get them done.

[erkrystof]

Here's the next installment, DX6i specific. DX7 Coming soon. Take care!

http://www.youtube.com/watch?v=aP8vGp2TOJQ

[jrb]

Any luck on the following "math" problem Eric?




Is it better to set travel adjustment -- say to 80 w/ DR @ 100 & 125; or use DR @ 80 & 100. w/TA @ 100?



TIA,

Jim

[erkrystof]

Any luck on the following "math" problem Eric?

Is it better to set travel adjustment -- say to 80 w/ DR @ 100 & 125; or use DR @ 80 & 100. w/TA @ 100?

TIA,

Jim

Well, I haven't had time to take a servo and try it myself and see if the servo throw truly differs or not. My gut reaction is that it really doesn't matter as long as your numbers match up, like yours do.

100% TA makes a servo move with one inch total throw (1 inch is an example, your mileage may vary). DR % 80 would be .8 inches and 100 % would be 1 inch.

If the TA is set at 80, then our total maximum throw possible would be .8 inches at 100% rate. With DR at 125, total throw would be 1 inch. From a purely mathematical standpoint there should be no difference here at all between option A or B.

So these both match, but as for which one is better....

As long as the transmitter supports going 'over 100' for TA and DR, off the top of my head I can't see a real difference there.

That being said, if the measurements are the same in the real world, and unless someone can tell me that there is something behind the scenes with TA that isn't obvious to me, the choice is one of how anal retentive you like to be, and that you wouldn't have any difference in flight one way or the other. :)

I could easily see some of the peeps I know go one way on the TA/DR mix and others choosing the alternative option.

Really comes down to what limits you want to impose upon yourself. (is DR my limiting factor on total throw, or TA?)

What do you think?

[WJCJR1]

For the record I set my TA @ the full motion range I want then the Dual Rates at where I wanted them.

Wayne