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Old 02-02-2017, 07:32 PM   #81 (permalink)
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Can anyone explain in simple terms the difference between PPM Negative & PPM Positive? I was happily flying in PPM Neg, and then read that someone was saying Pos was correct, so, I just switched from Neg to Pos. I didn't even rebind and it works fine. What up?
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Old 02-02-2017, 08:03 PM   #82 (permalink)
 

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Ppm negative is inverted ppm positive. Your module will generally only work with one and it depends on the module.
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Old 02-02-2017, 08:07 PM   #83 (permalink)
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Hmmm... I should check with my other stuff, but it worked with my Nano both Pos & Neg.
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Old 02-03-2017, 06:55 AM   #84 (permalink)
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I get it - it is my Phoenix Simulator that requires PPM Negative. It wouldn't work in PPM Pos. I guess the BNF's are not so picky.
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Old 02-04-2017, 10:18 PM   #85 (permalink)
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With the module:

The ppm out wire goes to both the module and the sim jack.

Sim jack --> Phoenix might need one. It's possible that another sim might need another.

Module --> The module will likely require one or other also, but go figure... some may be just as happy with positive or negative.

Worst case you could use a DSMX module that needs ppm negative, an EZUhf module using ppm positive and a FrSky 16ch module using ppm 16. You'd just need to change that setting when you swap modules.
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Old 02-02-2021, 07:21 AM   #86 (permalink)
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Hi everyone.
I made one with DM9 from spektrum with jeti R4light and its working good with any spektrum reciver. Also setup from jeti is :

PPM negative
computed

So my question is
Way i can't see any control on my realflight usb (SPMWS2000).

I Plug the usb to my computer and driver is installed correctly. And bind it with my DM9 .
I can see it in my connected device's but nothing move .

When i bind my usb to dx6 its work . But not my jeti to spektrum bridge????????

Any idea
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