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Thread: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

          
   
   
  1. #1

    Default Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    I've just purchased a Radiolink RC4G to replace my old Spektrum DX3 since I was having problems with the Spektrum, probably the Rx.
    Anyway, both are acting up in similar, or rather random ways, in that when two separate servos or two paired servos (e.g. LST2 twin steering servos) are plugged in they jitter, function LED flashes, do random movements, sometimes I can control them and other times a mixture of all.
    Since I was using an old Nimh 5 cell pack from my Losi LST2 to power the Rx and servos I figured it was tired and even though it was freshly charged it was giving out 2. something Volts under load. So I ditched that and knocked five Eneloops together giving out a nice 6.3Volts but even with that both radio sets are acting up.

    My best guess is that this is an issue of Amps and I need more. Are these classic signs of a lack of Amperage? Can I expect my problems to be resolved once I receive my Hobbywing 150A ESC which puts out 6V/3A.

    Incidentally, I just conducted two tests with the Radiolink RC4G which is crucial to the electrification of my Losi LST2. With two steering servos plugged into the one steering socket they go mad, jittering, swinging left and right. However, if I plug in two other Losi standard size servos (which used to be for throttle and gear change) into the steering and throttle sockets they work absolutely fine. Why is that?

    Any ideas?
    Tom.

  2. #2
    Silver Level BYT Member cbaker65's Avatar
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    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    Quote Originally Posted by Tommygunn View Post
    I've just purchased a Radiolink RC4G to replace my old Spektrum DX3 since I was having problems with the Spektrum, probably the Rx.
    Anyway, both are acting up in similar, or rather random ways, in that when two separate servos or two paired servos (e.g. LST2 twin steering servos) are plugged in they jitter, function LED flashes, do random movements, sometimes I can control them and other times a mixture of all.
    Since I was using an old Nimh 5 cell pack from my Losi LST2 to power the Rx and servos I figured it was tired and even though it was freshly charged it was giving out 2. something Volts under load. So I ditched that and knocked five Eneloops together giving out a nice 6.3Volts but even with that both radio sets are acting up.

    My best guess is that this is an issue of Amps and I need more. Are these classic signs of a lack of Amperage? Can I expect my problems to be resolved once I receive my Hobbywing 150A ESC which puts out 6V/3A.

    Incidentally, I just conducted two tests with the Radiolink RC4G which is crucial to the electrification of my Losi LST2. With two steering servos plugged into the one steering socket they go mad, jittering, swinging left and right. However, if I plug in two other Losi standard size servos (which used to be for throttle and gear change) into the steering and throttle sockets they work absolutely fine. Why is that?

    Any ideas?
    Tom.
    My sisters muggy had two steering servos ,an was acting like that ,truck would run fine ,then go haywire ,come to find out on it, it had a chewed servo wire that got
    hung up into the center diff.,an draining the batteries,
    So check for bad wires ,or bad servo ,a servo can also be shorting out inside draining the battery!,,,
    Just bash it!..

  3. #3
    Throttle, Brake, Dammit!!!! Revolauncher's Avatar
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    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    Sounds like you need an auxiliary BEC to power those servos. 3a is kind of low for MT dual servo application. I use the Castle 10 amp BEC and it really wakes them up, especially under load.
    -some say I am the Stig, but I'm just a New York cousin.

  4. #4

    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    The receiver probably has a amp draw limit which is causing the problem. Try bypassing the receiver using a Y harness to control both steering servos with another Y harness with power direct to one side and servos on the other and the last end plugged into the receiver. No aux BEC is going fix the problem. The servos have to be run direct.

    If one steering servo works fine then you have over loaded the receiver voltage and amperage limits with two servos in one channel. Bypassing the receiver is the only option.
    Last edited by Monstertrucker14; 03-12-2017 at 07:41 AM.
    IF you can't handle the TRUTH jusk keep on TRASH talking. The one who can't prove Im a FAKe is the real phoney!

  5. #5

    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    Problem sorted! I had to specifically hunt down some alkalines to make up a 4S 6V pack and, low and behold, everything works just fine! Not surprising really.

    Tom.

  6. #6

    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    You only figured out part of the problem. Voltage and amps are your problem.
    Last edited by Monstertrucker14; 03-14-2017 at 09:37 AM.
    IF you can't handle the TRUTH jusk keep on TRASH talking. The one who can't prove Im a FAKe is the real phoney!

  7. #7
    Throttle, Brake, Dammit!!!! Revolauncher's Avatar
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    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    Quote Originally Posted by Tommygunn View Post
    Problem sorted! I had to specifically hunt down some alkalines to make up a 4S 6V pack and, low and behold, everything works just fine! Not surprising really.

    Tom.
    Glad you found a cheap, working solution.
    -some say I am the Stig, but I'm just a New York cousin.

  8. #8

    Default Re: Old Spektrum DX3 and brand new Radiolink RC4G going nuts.

    Alkaline batteries are not a cheap solution. A good rechargeable battery pack is.
    IF you can't handle the TRUTH jusk keep on TRASH talking. The one who can't prove Im a FAKe is the real phoney!

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