Exponential setting on TX?
07-25-2010 | 08:32 AM
#1
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From: Yeovil, UNITED KINGDOM
Exponential setting on TX?
I have just purchased a Spectrum DX6i radio and am just installing it in a model. The manual is extremely detailed and explains settings very simply. However when setting up the exponential function I find that the instructions state that a positive setting gives a less sensitive movement around neutral. This is opposite to the instructions for setting up exponential on my Futaba Tx's, i.e. negative values provide less sensitivity around neutral. Anybody got an explanation? Seems a contradiction in protocols!
Tony
Tony
07-25-2010 | 09:14 AM
#2
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RE: Exponential setting on TX?
ORIGINAL: topwinguk
I have just purchased a Spectrum DX6i radio and am just installing it in a model. The manual is extremely detailed and explains settings very simply. However when setting up the exponential function I find that the instructions state that a positive setting gives a less sensitive movement around neutral. This is opposite to the instructions for setting up exponential on my Futaba Tx's, i.e. negative values provide less sensitivity around neutral. Anybody got an explanation? Seems a contradiction in protocols!
Tony
I have just purchased a Spectrum DX6i radio and am just installing it in a model. The manual is extremely detailed and explains settings very simply. However when setting up the exponential function I find that the instructions state that a positive setting gives a less sensitive movement around neutral. This is opposite to the instructions for setting up exponential on my Futaba Tx's, i.e. negative values provide less sensitivity around neutral. Anybody got an explanation? Seems a contradiction in protocols!
Tony
You set exponential with positive values on JR/Spectrums and you set it to negative numbers on Futaba. Makes no sense, but that's how Futaba wants it and how JR wants it.
07-25-2010 | 12:01 PM
#3
RE: Exponential setting on TX?
I started in the hobby with Futaba then switched to Spektrum. When I switched back to Futaba, I programmed positive expo into a couple planes without thinking. Boy were those fun first flights; talk about sensitive controls. Then I remembered that the two manufacturers do it differently.
07-25-2010 | 02:16 PM
#4
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RE: Exponential setting on TX?
I didn't forget they did things differently, I just couldn't remember who did what and set up a students plane Bass Akwards, the kid landed and said it was a mite touchy!!!!!!!!
I can never keep it straight so I always open my Futaba book to make sure I do it right.
Guess that's why they give us instructions with the radios.
I can never keep it straight so I always open my Futaba book to make sure I do it right. Guess that's why they give us instructions with the radios.
07-25-2010 | 04:02 PM
#5
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RE: Exponential setting on TX?
The bottom line is with the four majors (JR & Spectrum are the same for this purpose) is:
Airtronics and JR use positive expo for soft center.
Hitec and Futaba use use minus expo for soft center.
This is important to remember if you happen to use a mix of the two which I do with one JR, to avoid an occassional wild ride on a maiden.
John
Airtronics and JR use positive expo for soft center.
Hitec and Futaba use use minus expo for soft center.
This is important to remember if you happen to use a mix of the two which I do with one JR, to avoid an occassional wild ride on a maiden.
John
07-25-2010 | 11:20 PM
#7
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RE: Exponential setting on TX?
I can think of an awful lot of Futaba models going back a lot of years with expo and no little graph. This is not a ford and chevy argument about features but a simple caution to those who fly with any mix of brands that it is vital to be fully aware of this opposing feature in each brand and that can get them into trouble very quickly.
John
John
07-26-2010 | 01:15 AM
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From: Yeovil, UNITED KINGDOM
RE: Exponential setting on TX?
Thanks for the comments guys. Just wish manufacturers were more consistent. At my age I don't need any more things to confuse me!!. Now what was I about to do next!!
Tony
Tony
