1. i am using 7C, when using HK receivers (Orange or Frsky) for some reason all of my Hobby King (rather Chinese clones to put it simply) Receivers gets locked onto Sandy's (Sundaram's) Radio, doesn't matter whether he switched on first or i did, cant figure out why.

2. Flying Doc tells me that it happened at HFAA with two original Futaba Rx too,

Share if you expereinced something like that

in a lighter vein This happened during the airshow too, one of the aeroplane was powered on to show the spectators how controls moved in the RC Exhibition stall area. it started flying, suddenly sandy was flying two aeroplanes, one in air and one in the stall

Scary! I have had lost  binding... but getting the  binding 'Transferred' to neighboring Tx is pretty damn scary. Have you searched other forums like RCG/Wattflyer ? It should be pretty rare.... but a bad soft 'Binding' switch design may accidentally take the Rx into Binding mode, without your knowledge, and get the Rx Binded with the FASST Tx in vicinity with highest signal strength.

Rare, but quite possible. A routine ground check (I am kind strict on this) can always avoid such incidence.

All of them Chinese Clones , Checked with some 7-8 of em. i was on 7c and Sandy on 10 CAG.

JFF
i could be seniority issue here, let me try with me binding my Oranges ( ) to 14 MZ and hope Sandy's Rx binds to mine (14 MZ being Senior to 10 CAG )

Our field has about 3 7Cs, 2 10Cs and one 12FG on typical days... and all of us use the HK clone receivers.  Never had any such issues so far.  Wonder what the trigger is.

Gusty if I am not mistaken it happens with only our two 7Cs. When ever you are binded with orange/ other chinese receivers with your 7C when I switch on my 7C the receiver transfer to my control. This is not happening with 10CH or 6 EX.

is that so ? whatever it is, your radio is taking control of my Oranges, remember the Shikra event, how suddenly, my flying Shikra was behaving like possessed, when you were checking your radio in your car

I agree this has happened once too many times. Earlier we used to think it was some other fault like dislodged wing, loose linkage...and so on.

This happens only when I switch off and again switch on my 7C When your radio is on and linked. Its as if I have the remote control to sabotage your flying  >  . The power of god (devil  > ) in my hands. .

Futaba 7C had the problem of resetting the spreading code to 0. The code is supposed to be unique. It is possible both your radios have code resetted to same 0 value. Search for Futaba recall notice a few years ago, your transmitters may be affected ones.

not exactly, the other day, you were flying your bandit, i take off my Yak , she took off  well, i did some after take off aeros and suddenly you had control of my yak.

I had thought about that... but it should affect genuine receivers also.

Absolutely in that case it should be happening other way around too. It happens mostly when I switch off and Switch on in between. It happens with only gusty's receiver but not with any of my futaba 7 Channel receivers or Futaba micro 4 channel receivers.

Further it never happens when we both are flying my receivers in my two different plane with the two 7C.

And like gusty has pointed out if it happens at random any time also then it is scary. 

Yes it should affect genuine rx as well. The first post lists both cases and did not explicitly rule out not affecting genuine receivers. It did seem implied to me too when I first read the post, but reading again, it doesn't say genuine rx are not affected. Also it is not mentioned that the binding with first Tx is lost, ie it is responding to both radios. That suggests it is highly likely to have the same code.

What could be happening is that the stronger signal wins initially. Once the receiver is synced (do not confuse with binding) it could continue to be locked on until severe interference makes it lose sync. If both are flying together, you cannot really predict when the sync will be lost, it would be just random. When Rx tries to resync, it just locks on to the stronger signal at that time. Since this is a random occurrence the scenarios described till now are not conclusive.

However a simple test can check for common code:
Switch on TX1 and switch off Tx2.
Bind Rx to Tx1 and verify binding.
Switch off Tx1 and switch on Tx2.
If Rx responds to Tx2, then both have same code. Else ignore what ever I wrote and we need to look at something else.

And repeat the same for a genuine receiver.

It has never happened with my two genuine receivers flown with both the 7C.

either way I think we should reconfirm this in our next flying session.

This can also be possible if Sandy ever bind the orange rx with his 7c which now Gusty uses, I would recommend changing the model memory on Gusty's Tx and rebinding the rx on a diffent model number and see if this issue occures again. (on ground)

I have binded two of Gusty's Oranges with my 7C once but not all. But it seems to be happening with almost all.

I had also experienced loss of control(model went in a spin wldnt recover) on my model flying with my 7 C in shillong which i never experienced before. Gusty sir and Sandy sir were both flying tat day there. Gusty sir told me tat it cld be due interference. I cld nt make out why it hapnd. May be tis cld be the reason. But mine was original receiver.

Updates ?  Test results ?

Sandy Sushil and I, the test, final result, my orange rx seems to be liking sandy's tx more than mine

What about the exact test sequence suggested by Rotorzone ?  Using both clone and original receivers....

Even today we tried the same my original receivers are not hopping to gusty's 7C no matter what but gusty's oranges just hops on to my 7C the moment he switches of his 7C and at random in between too. But it is not happening other way around. Only thing which is left is to check  is, original receivers if binded to Gusty's 7C is it hopping to mine 7C?

Right... we certainly want to see if an original Futaba RX jumps from Gusty's TX to yours.

yesterday I had the opportunity to open gusty's 7C Tx for minor repair of broken toggle switch replacement. Thought might as well test out the binding problem too.

Updates.

Original receivers unaffected in all permutation combinations. It stays with both Tx rock solid same way after it is binded to it. The other Tx is not at all able to take control at all.

Clone receivers Orange as well as Frsky may be corona too, Jumps to my tx as soon as my Tx is switched on, no matter which tx it is binded too, even when Gusty's Tx is kept right next and my tx at some distance.

A Cloned Receiver exclusively binded to my Tx is also being controlled by Gusty's Tx as long as my tx is switched off.

On detailed examination of both Tx the most hilarious part was My Tx Card Eight digit Code sticker on the chip reads 08541250  and Gusty's Tx card Eight digit Code sticker on the chip reads 08541251.      

Wonder how we managed such coincidences. Managed to get born a day earlier and further managed to buy a Tx with code one number less.        

reminds me of a book i read long time ago written by Count Leigh de Hamong, such co-incidences existed with two people all the time, or may be there are too many numbers out there in our lives for some/most to match. all i say , there is something seriously wrong with these clones, 08541250 & 08541251 for co-incidence, radios bought from different parts of the world ending up in Hills together, that's.. spooky !!

Willing to sell my Oranges for Nuts

Put on the offer !!!

Are the nuts, pea or cashew..... In both cases, I would be more than willing to take some off ur hands..   


Regards
Doc

Very interesting find. May be orange and frsky are mathcing GUID partially.

Specify the nuts you want Seriously I'd take up the offer too.

Are you sure thats the way to find the GUID ? (I would call it UID, as GUID is 128Bit/16 Hex Characters long) ! It could be just the Serial/Factory numbers of that Chip.

Ujjwana  it was not refered as GUID. It was referred as the unique eight digit identification code hard wired in factory.

you should go through this service advisory on the erroneous  unique eight digit identification code programed in the factory and further which getting reset to zero  due to incorrect switching very informative.

http://www.rcgroups.com/forums/showthread.php?t=803207

I may even be wrong about the numbers being the unique eight digit identification code. But the symptoms and the coincidence of the numbers makes me believe so.

There is chipping/spreading code and GUID - serving two different functions. Futaba has clearly mentioned GUID is 8 digits. Chip code might be 128 bits long, I don't know. If you find any authentic description of FASST, let me know.

Somebody did publish the RE of the FASST protocol using Logic Analyzer. Let me dig my bookmarks once I reach back home.