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View Full Version : Discussion 8th channel in T7CHP/ FF7 transmitter


tungym
Feb 27, 2008, 07:28 AM
I start using the winscope(those software using soundcard line in) to see PPM signal . I am surprised that T7CHP is sending 8 channel spikes.
http://drtungym.blogspot.com/2008/02/futaba-jrdx7.html

I wonder if someone has ever hack into the circuit and feed the 8th channel signal?

I am asking this because I also found that E-sky lama 4 channel transmitter is also sending 6 PPM channel information. The LM chip inside the transmitter has the 5th and 6th channel grounded. However, despite I re-route the 5th and 6th input, I failed to make the receiver 5th and 6th channel works. I guess the LM chip actually ignore those extra channels.

Anyway can help?

I am thinking to feed those 8 channels into the ASSAN module so that I can use their cheap 2.4G 8ch receiver.

AndyKunz
Feb 27, 2008, 10:43 AM
The 8th pulse simply marks the end of channel 7 and starts the idle (sync) time needed before the next edge (which marks the start of channel 1).

Andy