What is the width of the negative shift pulse on my 9CAP transmitter? I assume it is in the 200 to 400 uS range, but can you be specific?

I tried to measure the pulse with a scope on one of the five pins after removing the RF module but could not find a pulse. I used the first pin on the left (viewed from back) as common for the scope. What am I doing wrong?

Hi Flightwatch,

Our frame rates range from 1000uS to 2000uS, with 1500uS typically being center.

I hope you find this information helpful. You can also reach our Futaba support technical team at 217-398-8970, or via fax at 217-398-7721.

Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician

Hi Krysta,

I'm looking for the width of the marker pulse, usually 0.2 to 0.4mS, that separates the 1.5mS frames. Some receivers require a value different from Futaba's value.

Hi Flightwatch,

I hope this information is what you are looking for:

The first pin from the left (when looking at the back of the transmitter) is actually the signal pin and not the common pin. The common pin is the second pin from the right when looking at the back of the transmitter. This pulse is best viewed when the transmitter is ion PPM mode. The frame rate of this negitive pulse train is 22ms.


I hope you find this information helpful. You can also reach our Futaba support technical team at 217-398-8970, or via fax at 217-398-7721.

Sincerely,
Krysta
Lead Futaba Customer Service and Programming Technician

Thanks Krysta - Made the measurment: 400uS.