Thanks for the replies,
My main concern was any problems with the transmitter output driving two RF boards and would any isolation be needed to separate them.
I would like to experiment with transmitting on both 2.4mhx and 35mhz at same time using some form of dual receiver redundancy system or even one receiver running one aileron/elevator servo etc - Just for fun
In our club we all have our own frequency so I don't have any issues with shooting someone down if I forgot.
I have one snag with pulling the crystal, I dont have one
as I am using a sync module in my JR 9XII, and the other reason I asked the question is I dont really want to be pulling in and out the module, as I still have a lot of models on 35mhz, and dont want to risk a damaged pin/dry joint.
That is why for now I have been flying the frsky DJT module on a JR347, but big problem is it has only 4 model memories, and I am slowly changing models over so need more.