hi Emadawad,
sorry for the late reply. i did not get a notification
need to check that setting.
i am not sure about the line but i would try by opening up the rc's (both) and check connection while opened. i did not have that issue (yet) whatsoever but i do still have slave video problems although i separated the 5.8ghz from the internal antenna with a 5.8ghz that is now on the side of the inside. i will do the same for master soon and report back how i got along and if i ran into issues.
in your case i would check internal cables and connections and if you have the opportunity then check with another RC (maybe your local shop can lend you one in store for check and the you can see if it is your RC or AC with transmitting issues.
hope i could be of help - late but still better than nothing
sorry again for the late reply.
if you have anything else on you mind let me know.
i check my emails more often.
my address is:
[email protected]
cheers
Martin