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[kmmbcwebmaster]

hi all see if you can work this one out ? a number of our members have switched to 2.4 with no problems and at present five of our members are using the turnigy 9x without problems however i recently changed my battery pack from nimh to lipo now my transmitter is over powering one of our members transmitter also 2.4ghz if i switch of my transmitter his works perfectly but once turn mine on his starts twitching surely just by changing to a lipo shouldn't cause this problem but have exausted all other options to solve this any ideas 

[Martin (Admin)]

Are your NiMh and :ipo  both exactly the same voltage?

[hover tim]

I would of said it was your battery if thats the only thing you have changed, Why do you want to use lipo in your TX?

[Timo2]

Hi

  Lipo in TX,    charge last over 10 day use ( 3 hours at a time ) cost = £11 .00 per Lipo x 100 recharges = 11p per 30 Hour

  Timo2

  P.S. Scottish    =     short arms & deep pockets 

[Martin (Admin)]

I'm wondering about the voltage because if the Lipo is higher, the regulator circuit (chopper) could be transmitting interference...  Malc, where are you?!?

[Timo2]

  
    LIPO

             3S gives a good steady output of 12.5v but drops-off quickly to 10v

   Timo2

        

[Timo2]

Hi All

    Ref   TX / RX  matching on switch on,

    We at ( KMBC Glasgow ) in the passed, if up to 4/5 Turborix / Hobbyking systems in the area sets No 4/5 could take a longer

    time to find there RX but no problem working the units   

Timo2

[malcolmfrary]

I'm wondering about the voltage because if the Lipo is higher, the regulator circuit (chopper) could be transmitting interference...  Malc, where are you?!?

Does using a LiPo pack in another TX cause the problem to happen there?  More specifically, the same pack.  Since its known that the problem came with the use of the pack in a particular TX, the culprit has to be one or the other, just a question of figuring out why to either end or avoid the problem in future.  Manufacturers have been shy about explaining how these things work, so theres some guesswork involved. 
They use cellphone technology, so its a fair bet that the signals are encoded values transmitted with an address code.  If a particular TX in a group is chucking out a stronger signal, it might swamp out bits of its neighbours signals in short bursts for long enough to be seen as a glitch.  Simplest test for this would be to wander off a way and see if the glitching reduces.
It could be that this one particular TX has a regulator that behaves differently when presented with a battery that can deliver more current.
Just groping, guessing and thinking aloud.

[kmmbcwebmaster]

hi all ok the facts of the fault and what we tried to solve problem.we use these sets for our multi channel boats for obvious reason that the turnigy has 8 channels with 3 proportional controls so switched my battery to a lipo as nihf battery's needed charging after every use.yes voltage of lipo was the same as the nih i was using.tried binding my transmitter to his boat and his to mine and got same affect my transmitter over powered his and the closer i got the worse it would get ,how ever a fellow member with exactly the same set up as the one i was over powering was sat at the side of me but he had no problems with his set and this is why we can not work out why this is happening.   

[kmmbcwebmaster]

this may but spanner in the works have just found out that one of our other members is running his transmitter on lipo and have not had the same problem of swamping when sailing with the member that my tansmitter is swamping 

[CF-FZG]

 
    LIPO
             3S gives a good steady output of 12.5v but drops-off quickly to 10v         

3S should give a maximum of 12.6v off the charger.  If it's dropping quickly to 10v, then it's knackered because it's nearly flat.  It should drop slowly to around 11.1v and hold around that figure until it's nearly empty when it will drop steadily to LVC on the BEC/ESC, (usually set at 3.3v per cell)

A 8 cell NiMH pack will be around 12v off charge, but settle fairly quickly to around 11-11.3v and slowly drop to around 10v when you need to look at charging fairly quickly as it'll drop quite rapidly below 10v.

To answer the OP, most Tx that use an 8 cell NiMH pack will run quite happily on a 3S LiPo, but keep a close eye on the voltage as once it get's to around 11v you ain't got long left before the pack's boogered. 

Also, with the further info you've given, I'd be looking at you're mates Rx/installation as probable cause.


Mark

[Timo2]

Hi

  Sorry not clear   LIPO will 12.5 for a long time ( about 30 work hours )  but the drop off is very Quick

  Timo2

[justboatonic]

this may but spanner in the works have just found out that one of our other members is running his transmitter on lipo and have not had the same problem of swamping when sailing with the member that my tansmitter is swamping 

Its unlikely the lipoon its own is the issue here. The problem will likely be your transmitter and the extra voltage of the lipo. Hobbyking gear is good, I've just bought the 6channel 2.4Ghz set. But they did have issues with some of the Turnigy sets.

Do you have the same problem when using nimh cells in your transmitter? If not, then the extra voltage of the lipo is making your tx more powerful and possibly leaking signals.

Is the other guy's rx a single wire aerial or two aerials? If two the aerials should be set at a 90 degree angle to each other. Make sure they are and get him to try re positioning the rx.

HTH

[kmmbcwebmaster]

we have discovered another member also using lipo in his turnigy with no problems .we are all using the new 9x v2 sets with only the one aerial.i had a set that got damaged but most of internal bits are ok so we have tryed switching the moduals in his set with the one from my old set and touch wood seem to be ok now so thinking his transmitter modual was on a band close to mine and with me using lipo was clouding his over.?????? 

[kmmbcwebmaster]

hi all just to give you give you an update on the issue the member of the set i was swamping has just received a new turnigy 9x set that he ordered as a standby set complete with same lipo battery as my set .his new set works fine with no problems with swamping from my set so he is now using his new set.we still have not been able to come to a satisfactory out come to this problem and can only assume that there will be some problems with swamping and interference even on 2.4 unlike what the manufacturers tell us  .

[justboatonic]

hi all just to give you give you an update on the issue the member of the set i was swamping has just received a new turnigy 9x set that he ordered as a standby set complete with same lipo battery as my set .his new set works fine with no problems with swamping from my set so he is now using his new set.we still have not been able to come to a satisfactory out come to this problem and can only assume that there will be some problems with swamping and interference even on 2.4 unlike what the manufacturers tell us  .

I'd very much doubt it tbh. I know turnigy had some problems with this set and its likely yours \ the other person's had a fault.