quarry44 wrote:I've done some investigation,and found the trainer port less than useful.I could only find one pin that had a voltage on it.Perhaps the fact that the switch is spring loaded to the "off"position has some bearing on this.
So I looked at the module connections instead.It appears they don't conform to the pinout shown online in various places.Looking at the back of the tx with the module removed,I got the following:
Left to right,pin1=no volts.pin2=neg ground.pin3(centre)=4.8volts.pin 4=12.6 volts.pin5=neg ground.This transmitter uses a 9 cell battery pack,hence the voltage.
Am I correct in assuming the 4.8 volts is the PPM connection?
I've asked the fellow supplying the module,and he's doing some investigating of his own,but I thought I'd ask too.
There's a photo of the back of a Futaba module on the rcmf forum,and that shows the ppm on pin5,batt+ on pin4,pin3 blank.batt- on pin2,and pin1 blank.
Hence my doubts.Was this series of transmitters such an oddball?There's very little online about them.72 mhz was not a recognized frequency in NZ when this tx was made,so I'm assuming it was imported from elsewhere at some stage.
does the transmitter contain a CD8081 or NE5044 encoder chip? you can pull PPM from pin 11 iirc
blog.quantifly.com: (since removed)
Compared to 2PL Attack 4 use single board for both signal and modulation therefore
to trace its ppm signal source it has to focus on its signaling ic - CD8081N or
NEE5044 Programmable seven-channel RC encoder, according to the datasheet the
ppm signal is located on pin 11, where voltage and ground is 16 and 8 respectivity.
hrrrm, no PDF attachments, plus it was huge, so I took a snapshot of the datasheet