08 PM | 11 Jun

Using a Spektrum DX3S and SR300 reciever with a Traxxas E-Revo

Spektrum DX3S transmitter

Spektrum DX3S transmitter

After unpacking, charging up the batteries and checking everything worked, the first thing I wanted to do with my new E-Revo was replace the radio gear. Don’t get me wrong – the transmitter and receiver that come with the model are fine, and I’ve not read any complaints about them, but since I bought a Spektrum DX3S for my touring car, I’d much rather use that.

The main benefit of using the DX3S is that it’s a 2.4GHz system – so it should have a greater range, and no risk of interference from other transmitters. There are other benefits too – it only needs 4 batteries, not 8, and since has a 10-model memory, I can set it up to work with the E-Revo and the T2R Pro straight away using the two receivers it came with, and by picking up another receiver I can  control the AX10 with it as well. I might even use it for the boat – one transmitter for all my non-flying models…

Anyway, the point of this post is to describe how I got everything set up to use the DX3S with the Traxxas E-Revo, so let’s crack on.

I’m choosing to use the SPM SR300 receiver in the E-Revo. You could use the SR3300T receiver which also comes with the DX3S, but as that is the one with the telemetry options I’ve put it in the Xray. The Spektrum receivers are nice and small, so should fit quite nicely.

2 - Note which wires are throttle and steering

1 - Open up the receiver box and note which wires are throttle and steering

The first thing we need to do is check everything works happily with the new receiver, so open up the receiver box and make a note of which wires go into which socket – two are for the steering servos (labelled CH1) and one is for the ESC (CH2). Fortunatly, the DX3S is a three-channel transmitter with matching receivers, so the presence of two steering servos isn’t a problem.

Next, you’ll need to trim off the tabs on the plugs so that they’ll fit into the Spektrum receiver. Use a sharp knife of a pair of snips, and be careful not to break the plugs. Once you’ve trimmed the plugs, fit one of the steering servo wires into the Aux port on the servo. On the DX3S transmitter, enable the Aux channel. Plug the batteries into the ESC and turn it on – now test that the steering works. If it does, you’ve successfully set up the second servo on the Aux channel.

2 - Check everything works

2 - Check it all works

Next, unplug the batteries, plug the throttle plug and the other steering servo into the throttle and steering ports on the receiver, and unplug the Aux servo. Turn on the transmitter, plug the batteries in to the ESC and turn on the ESC – blip the throttle trigger on the DX3S and the wheels should spin, turn the wheel and the steering should work (this proves that both steering channels are working, and you’re not just using the one). Next, disconnect the batteries, plug the Aux servo back in and you’ve got everything working. If anything hasn’t worked, check it’s all plugged in the right way around and in the right ports. If at any point you can’t turn on the ESC, chances are you’ve got a steering servo plugged in to the throttle port.

3 - Remove Traxxas receiver and replace with Spektrum receiver

3 - Remove Traxxas receiver and replace with Spektrum receiver

Next, you’ll need to remove the old receiver – first, loosen the screw you can get to on the cable-holding box alongside the receiver box. This is a neat little device that keeps the receiver box waterproof – the cable are fed through some foam inside it, which keeps moisture out. You’ll only need to undo the one screw, and then you can pull the aerial lead out from the receiver box. The 2.4GHz aerials are very short, so don’t bother trying to feed the new one through – it should be fine just tucked inside the receiver box. With the old aerial lead free, you can gently (but firmly) lever up the Traxxas receiver. Use a bit of servo tape on the new one to stick it in place, carefully replace the blue waterproofing ring around the edge of the box, and screw the top back into place.

That’s it – job done!


  • Bis

    Wondered if you’ve had any issues with your radio on your E-Revo. My DX3S started glitching lightly as the truck passed around metal objects a while back and has progressively gotten worse and worse up to the point that I cannot drive the vehicle anymore because it makes the throttle/brake glitch very badly in any conditions.

    The only things that have recently changed are the fact that I upgraded to an MMM brushless system, other than that everything has been fine.

    Thank you for your feed.

    June 13, 2009 11:14 am
  • Andy

    So far, no problems, but it’s not had much use yet – it got one run outside and the ESC died! I’m sending it back to Modelsport this week, so as soon as it’s been sorted I can try it out some more. Anyway, the first obvious things to try are new batteries in the DX3S, and rebinding the receiver to the transmitter. Assuming you’ve already tried those steps, try the other receiver you got with the DX3S and see if you get the same problem. Finally, if you can, try the receiver with another ESC/motor combo – to see if it’s just the Castle kit that’s the problem… The whole point of 2.4GHz is that there shouldn’t be any interference, so perhaps it’s a problem with the ESC?

    June 13, 2009 3:00 pm
  • Jared

    i have a problem with my slash i put the sr300 reciever in there and evrytime i land hard off a jump or something or rollover my whole car turns off im using the stock xl-5 esc and motor and the light on the esc goes out and i have no throttle or steering. I dont know wether its a problem with the esc or motor. if someone can please respond back to me i ould greatly greatly appreciate it. My e-mail is Jbrez@comcast.net

    July 24, 2009 3:41 am
  • Andy

    Sounds like a dodgy connection somewhere – perhaps a dry or cracked solder joint between the battery and the ESC. My first thought would be the battery connectors, so if it happens with just one battery then it’s pretty obvious that it’s the connector on that battery. If it happens with all batteries, then check the battery connector attached to the ESC. Turn the model on, and then try wiggling the various joints in the power leads to see if it turns off – if it does, there’s your problem. If that’s all ok, it’s probably something inside the ESC casing, in which case contact Traxxas and see if they’ll swap the ESC.

    July 24, 2009 9:03 am
  • Robert S.


    Does the SR300 also fit in my 1/16 Slash VXL?


    February 12, 2010 2:45 pm
  • Andy

    Yes, I have the E-Revo VXL as well as the 1/8 E-Revo, and it will fit fine in both.

    February 12, 2010 2:50 pm
  • RS


    In your post you say: “The 2.4GHz aerials are very short, so don’t bother trying to feed the new one through – it should be fine just tucked inside the receiver box”

    What is the usable range if you just tucked antenna inside the receiver box? Very many people complain about DX3s range and recommend drilling hole in receiver box to pull antenna straight up and still some get poor range.
    Have you tried range test it with straight antenna?

    May 4, 2010 6:23 am
  • Andy

    I don’t know the exact range as I haven’t taken it anywhere big enough – I took it on a sports field and it went to the far corner so I had to stop; on the beach there are too many obstacles (or people); and anyway, once the car is a small blob you can’t see any obstacles (large pools of water / dog muck / people sunbathing on the other side of a drop) so there’s no point being able to drive that far away if you can’t see where you’re going…

    I certainly haven’t had any problems with range; the DX3S seems fine to me.

    May 4, 2010 8:27 am
  • Bis

    Hey, here I am a year later, the second DXS3 has once again began with range and glitching problems. This time it did it at the beach of all places. Just thought I’d refer back to this post.

    July 22, 2010 8:23 am
  • Alex Hall

    Why is it only working when I set Throttle to reverse? It’s very strange.



    April 10, 2014 7:20 pm
  • Andy

    Have you tried recalibrating the ESC and controller? Assuming you’re using the stock Traxxas ESC, the instructions are in the Revo’s manual (Set-up Programming), but it may be as simple as that.

    April 11, 2014 10:41 am