"Thanks for the link John,
Don has given me some suggestions, but still no joy in complete fix. I have managed to get the telemetry data working between ground modem and air modem, however, as soon as I turn on my Taranis radio, I get a…"

"Yes it is strange that I have the modems working with Mission Planner, so that tells me that there is nothing wrong with the RFD modems but when I try to use it with QGC I get nothing so it must be a setting or parameter or something like that."

"Great thanks John, hopefully we can work out what's happening.
Here's my current setup I'm working on.
Pixfalcon FC, Hexa X frame. ESC Blheli Oneshot. M8M GPS, Frsky D4R-II Rx, Taranis, RFD900u, 600mw VTX for FPV.
Here's what I find with PX4  and…"

"I am wondering why I am not getting any help on this thread? Is it only for the advanced users?"

"I've just read on Ardupilot they recommend to run a separate 5v power line to the onboard radio. At the moment power is being fed from the Pixfalcon FC. Would this make any difference? It doesn't seem to matter if I connect to Mission Planner,…"

"I need some help with my connection.
Here is my setup. Hexicopter, Pixracer, D4R-II, 5.8Ghz - 600mw VTX
My first choice was to go with Mission Planner, so connected everything. Had telemetry from RFD but I could not get a good stable flight no…"

"Thanks for that Paul. Hopefully will get it sorted shortly and be in the air soon.
Glen"

"This is off the RFD900 datasheet/manual.
Pin 1 of the FTDI cable (black wire) should connect
to pin 1 of the RFD900 header. In order to
power the modem from the +5V USB power, a jumper is
needed to connect pins 4 and 6.
To power the modem from an…"

"Am I reading this right?
The modem that is on the quad should have a jumper across pins 2 and 4.
And the modem connected to computer via USB has jumper across pins 4 and 6?
Thanks.
Glen"

"Can anyone tell me if the power board (ACSP4) that is an optional with the Pixracer is any different to any other pdb? Is there anything special that is on it that it's a must have?
Thanks
Glen"

"Kent,
Thanks for the info. Loads of it there for me to digest at this stage but will work slowly through it get to where I want to.
Firstly. I am not familiar with AT commands and where/how I view/change and program them. Can you point me the right…"

"Hi Guys,
Just got my new 900x in the mail last week. I am hoping to connect a D4R-ii for rc control. Seppo assures me this is possible on the model which is why I get him to send me the new improved model. Not exactly sure how this is done yet or…"

"Something like this maybe?FL300.jpg"

"I wouldn't say "don't" fly with gimbal and tall legs due to "IRIS is to heavy". Mine flies well with that set up. No problems with under power. IRIS holds loiter at half throttle and I have not found any difference in power towards the low battery…"