SR3300T with HV Servos
 

According to the specs on Spektrum:

http://spektrumrc.com/Products/Techn...dID=SPMSR3300T

If I use a HV servo, will the RX automatically provide a higher voltage to power the servo to achieve its full potential? Will the RX provide 6v or 7.4v to a servo like this?

http://www.hobbycity.com/hobbycity/s...idProduct=9983

No one knows?

If you run electric the ESC usually provides 6V. You need to get a BEC (like Castle BEC) and adjust the output voltage with that. In your case to 7.4V. The receiver will get 7.4V and so will the servo. You need to remove the red wire from the ESC's RX wires so you can "disable" its BEC. There are some pics on Castle's site.

On nitro you could get a LiFe receiver pack or a lipo one and again use the BEC to adjust output voltage.

You could also solder acouple of diodes on the + from the ESC to the RXer.

That would drop your voltage by approx 1.4v, and the receiver will be fine.

Shawn.

I'm running 1/8 electric so I want to bump the voltage up to 7.4v in order to run the HV servo to its full capability. Seems like a hassle having to install the B.E.C....

Finially had time to come back to this one again, and if you are running spektrum then you should be fine. Their own specs say 9.6V input, so a BEC is not needed at all.


If you are running an AMBrc transponder, you may still have to run lower voltage for it thogh. The MTX (the clones) are rated for 20V!

Cheers,
Shawn.

That would be true for nitro using a 2s lipo receiver pack, but he is running electric so a BEC is needed to get 7.4V to the receiver. I guess technically you could use a 2s lipo Rx pack in an electric setup also but it wouldn't make any sense as a BEC is smaller, lighter, and you already have a voltage source powering the car that can be used. But either way yes the Spektrum receivers have no issues running on 7.4V, mine has been working fine.

Adrictan, installing an external BEC isn't a hassle at all. Just need to add a set of small leads in parallel with your main battery input. I take those small wires into the BEC at 14.8V and plug the other side of the BEC into the receiver which outputs 7.4V. It's mostly a matter of finding where to mount the BEC and how to run the wires cleanly. As you can tell my wiring isn't that aesthetically pleasing!

http://i47.photobucket.com/albums/f1...3/P1020577.jpg

understood. Thanks for all the replies.