Can servo signal boosters be used on speed controllers to help prevent voltage drop on the signal line. I'm currently building a very large scale go kart with rc motors and speed controllers, the receiver wires will be very long 45+ inches. My receiver has dual throttle channels and I'll be putting 4 esc into each channel all throttle no servos. (8)TP Power 5870s and (8) Hobbywing max4s.

I'd be surprised if you need anything special at all. In the scheme of things, the PWM signal is very low frequency and I'd think the impedance of the signal input on each ESC relatively high. I've run higher frequency digital signals (800kHz vs ~300Hz) over 3-wire ribbon cable over similar distances with no issues. Decent cabling/termination and *maybe* shielding should be enough, but the empiricist in me says test it ;-)

From what I understand they do not prevent voltage drops but gives the signal a low impedance so it will be less sensitive for distortion from outside.

Thanks guys that's kinda what I figured, but a little reassurance is always welcome, I do have pics of this machine I'm building, but I'm new to the forum so I can't post them yet. Thanks

If they are strong servo's I would make an own cable with thick powerlines and maybe a shielded signal wire. And then on the servo side a capacitor of about 470uF to prevent some power dips.