saikat, the original firmware never had an option to control the backlight (in fact the hardware never had a backlight). Yes, when one would switch on the Tx, the backlight would come up. That was because the positive supply gets routed to the backlight.

Controlling the brightness/duration of the backlight via the er9x firmware also required small hardware mod (http://blog.pannuhuone.pro/p/turnigy-9x-backlight-mod.html) conecting the backlight to a free pin on the atmega. I might be incorrect but *I've a feeling* Turnigy has now included that as a standard feature in the new transmitter...so the older scheme of things might not work

Another simple possible way would be to route a wire from the +5v to the backlight +ve via a 220 ohm resistor, so when the tx is switched on, the backlight comes up; there will be no control of the brightness/duration via a software menu though. Route it thru a toggle switch, drill a hole and mount the switch

thanks girish - that will do nicely - in fact I will use one one of the existing switch positions - since
I do not plan to be flying any super complicated models

Hey Guys!!
How do I change the subtrims? I am using kk2 and it dosnt show all the values 0 in normal position in the receiver test. Please help me.

It should be on the limits screen.

can you make a tutorial on how to adjust them? if possible plz.. or a short video showing you changing them.. or plz link me to a video.

Thanks in advance.

@Girish, I figured it out.
Thanks

That's a really nice radio.i'm planning to get one.Any advice,thoughts are welcome.Could anyone point out the merits of using the orange module and of the FrSky module?and what kind of Rx for the orange?also,how badly would range take a hit if i used the internal antenna?thank you all in advance.

how do i assign the pit trim. knob for channel 7 on my radio/receiver?

In the mixer settings, CH7 should be 100% (or whatever weight) and source should be P1/2/3 - whichever pot you wish to assign

okay got it
and what about using the switches as ch6?

What would you want to do. Use it as a flip switch between 0 and 100% of servo signal? I dont have the radio in front but off the top of my head i think the following should work

two mixes to ch 6 as below

ch6 trn 100% full
        !trn 0% full replace

using the trn switch here for illustration
full is source. Might be max on your version of er9x

Are you trying to setup  proportional flaps

no, i am using it on my quad for tuning PID
the switch will save the PID settings and the knob(P1) will change the values..

thankyou for your help sir I dont have er9x. i have default firmware

Rahul the firmware on 9xr is er9x rebranded

haha okay
i dint knew.
thanks for the help sir.
will let you know further more as i proceed

Sir it came without custom hassles and or you had to pay something to them???

no, i bought it from a local store

From Which Store And the case from local store ? Please tell the price too .

got it in march i think from rchobbyaddict
7400 with a battery

Thats Good Do They Keep The Aluminuium Case For that If yes How much?

No they dont even keep the radio now!
i got the last piece )
aluminium case isnt available, you can buy it from hk

ok thanks for the information we can also buy the radio from hk i think it is wpc approved or we will have custom hassles ??

no idea, ask others
i never bought a radio

what if i put 2200mah 20c battery in turnigy 9xr instead of 2200mah 1.5c. does it effect the transmitter???

yes obviously it will a higher discharge rate lipo will burn your radio