Hi, I’m having trouble getting my sabertooth 2x25 to work reliably in rc mode. I’m powering a pair of wheelchair motors. I’m using a RadioLink T6EHP-E transmitter and an R7EH-S receiver. My dip switch configuration is 1 off, 2 on, 3 on, 4 on, 5 off, 6 off. I would prefer to have switch 6 on for a fail safe but the behaviour is less erratic with switch 6 off, although I still get some jerkyness. My primary battery is a 6s lithium pack. I’ve tried powering the receiver directly from the sabertooth and from a separate 5v battery but I get the same erratic, random jitters.
Any suggestions as to what I can do to eliminate the the random jerkyness and motors randomly spinning by themselves? Is my cheap receiver transmitter combo causing the problem, or maybe I’m getting some interference? I notice the problem seems to mostly occur when I move around the room with the transmitter in the neutral position. It seems like the receiver loses the signal briefly and resets itself when I have the dip switch 6 on. When I turn off switch 6 I get more stability but still get a few random jerks.
I want to run an rc lawn mower and really need the controls to be reliable for safety reasons.
Hi James,
The first thing to do would be to use the manufacturer “Sabertooth DIP switch wizard” for proper setting the switches.
When you connected the RC receiver from a battery, how did you wire things together ?
I’ll have a look at that wizard but I think all my switches are set up right. I tried two methods, first I connected directly from sabertooth to rc receiver. I paralleled the negatives and positives from the two channels and plugged them into ground and 5v. Then I used a 5v usb battery pack and wired the positive from the battery to the two positive channels on the receiver. I left the 5v empty on the sabertooth. I paralleled the two negatives from the receiver with the negative on the battery pack and wired them to ground on the sabertooth.
The antenna wire on the receiver is very short and the sabertooth is relatively close to the two wheelchair motors. Wondering if this is causing interference?
Hi James,
If you connected both the positive and negative of the Sabertooth and the Battery you might have broke the internal 5V regulator (BEC).
I wold not really be worry by interference, the length of the antenna goes with the wavelength of 2.4ghz signal.
Are you able to calibrate the RC signal ?
