I don't believe there's anyway to modify the latency between the 3pk (or other transmitter) and the TX module without actually modifying the transmitter itself. Thus the only area for change is the Spektrum module itself. It's like if you were talking to someone on the phone. If the guy on other end is slow, say it takes 1 second for him to respond, there's nothing you (Spektrum) can do about it. You can only be as fast as possible on your end, but the guy on the other end will always be slow - so effectively the guy on the other end is a constant. I understand that Futaba has a regular and a HRS mode, which I believe would basically make "the guy on the other end of the phone" respond faster. Regardless, the differences quoted by Spektrum even for the HRS are in the range of 2-5 ms, not in the tens or hundreds of milliseconds. Who knows, maybe I'm missing something else?

I just remember on the Nimble site :blush: that there is a 16ms decode between the 3PK and module... Maybe this has been reduced.

Also, on the old receiver modules you were allowed (by Spektrum) to shorten the aerial wire down to 3.6” without any noticeable loss in reception. Can you shorten the receiver aerials in the PRO and Micro receivers as well?

Yes you can cut latancy down by 2-5ms. Radio wave travel at the speed of light, in a vaccum is 299,792,458 meters per sec! The raw transmission part between radio and your car (lets say 100m) is .04nano sec! The rest of the time is spend on encoding on radio and decoding on receiver.

Here is a quote from the Spektrum site about the Pro series

http://www.spektrumrc.com/Products/D...ProdID=SPM1011

"While the original system adds just 5.6 milliseconds (that’s 5.6 thousandths of a second), to your radio’s own processing time, the new Pro System’s module and receiver combine to lower this already miniscule figure to a scant 3.0 milliseconds. It all adds up to lightning fast response and it’s sure to have racers feeling more connected than ever."

So the latency would be 16ms for the radio decode + 3ms for the Pro Series... is it worth it???

Exactly, that is the latancy added by spektrum. I would think involves encoding and decoding plus other stuff. If you are switching to it now, for sure Pro will be better. Is it worth tossing the old spektrum and switch... it is a question we all have to ask ourself.

Bare in mind that everything to do with RC cars, the more money you spend the less incremental performance increase you will get.

IMO A caffine boost would do more :) lol

Very good point. I really do not believe we are able to tell a difference in the speed at all. I think it may have more to do with the spectrum receiver output to the servo. Has anyone thought about how many amps the spectrum reciever can allow to the servo? That right there would make a difference if the new receiver has a higher output.

Out of interest what is the total latency of their DX2 and DX3 systems?

It doesn't work like that. The + and - that feed the servos isn't supplied by the reciever, it comes from the battery (nitro) or ESC (electric). The reciever is essentially a voltage "distribution box" or splitter, but it doesn't regulate the supply in any way.

Then why does some receivers have a 2amp or 3amp bec? (able to handle)

receivers do not have BEC, speed controlers do.

You can say that again - it just feeds the servos connected to it. But it does take some supply for itself.

That is why some people had problems with their Spektrum shutting down - they run a power capacitor on the receiver to ensure a consistant voltage to it (a 10v 4700uF Cap I believe - is an option to purchase)

The shutdown issue that you're referring to was actually an ESD (Electrostatic discharge) issue. The new software for the original SR3000 receivers and the software on the Pro Series/Micro SR3500 has corrected that issue. The cap is used in low-voltage situations, such as in Mini's and Micro's or 1/12th scale. Some ESC's did not have a high enough output on the BEC; the Voltage Protector (SPM1600) rectified that issue. I also believe that the SR3500 Micro Receiver also has a lower minimum required operating voltage, making it a better fit too for 1/12th and Mini/Micro cars.

As others have stated, the receiver does NOT put out any power.

The plug from the ESC delivers the power to the receiver. The positive and negative connectors inside the receiver are common to eachother. They are connected all right there. The power to the servo comes directly from the ESC. It only goes .1" from the esc plug in the receiver to the servo plug.

The only energy converted by the receiver is the signal sent to the servo to tell it where to move. This energy too comes from the BEC circuit from the ESC. And with spektrum, it has a bit higher energy consumption because of two way communication.

Thus in some lower voltage applications, or for those people who use the Quantum series of speed controlls, the BEC output of those speedos was in many cases not enough to power the receiver, or keep it turned on anyway.

I used a cap for awhile with good results, but made up a 6v regulated output device to power only the servo. I know its getting 6 volts now, and it was noticable faster than with the 5 volts being supplied by the BEC. AND, I don't have to run the capacitor because the only BEC current being used by the receiver only goes to keeping it turned on, and to power my personal transponder.