Servo "waving"
03-27-2014, 06:05 PM
#26
Senior Member
My Feedback: (26)
For those who have not noticed servo extension leads are all not the same. The gauge of the wire and the substitution of copper wire for other material all comes into play. I ran into a similar problem with a made in China lead. The gauge was correct but they did not use copper wire. What we are left with is low current. I went back to a premium JR lead and problem solved. JR also sells sub par leads so don't be fooled.
03-27-2014, 08:18 PM
#27
My Feedback: (10)
It is caused by high resistance at a connector going to the servo. Unplugging and plugging the extensions back in a couple of times will cure it as the connectors we use self clean when we plug them in. The high resistance at the connector sends a reflected pulse back up the signal wire and it effects the incoming pulse causing the oscillation.
03-27-2014, 08:34 PM
#28
My Feedback: (19)
It is caused by high resistance at a connector going to the servo. Unplugging and plugging the extensions back in a couple of times will cure it as the connectors we use self clean when we plug them in. The high resistance at the connector sends a reflected pulse back up the signal wire and it effects the incoming pulse causing the oscillation.
03-27-2014, 08:51 PM
#29
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oxidation can contribute also and cleaning it is difficult. I have pitched old extensions in these cases. If the wire is still good/good quality I may save the wire and re-crimp a new plug with those MPI crimpers and plugs. I'd only do that on longer extensions.
03-28-2014, 11:02 AM
#31
Senior Member
Lone Star, when using a "Y" harness with some of the newer receivers that have low voltage decoders, the two servos connected in parallel can load the signal pulse voltage down enough that one or both servos will not work at all or at best, very intermittent. This was very noticeable with some of the early and expensive Futaba 14 Ch. receivers when used with certain Hitec servos. Hitec came out with a modification for their servos that resolved the problem. Still, when more than one servo is connected through the "Y" harness with these receivers, the signal level is still loaded to a level where there is little headroom. Its just not good practice to use a "Y" harness with these receivers.
On your 517 receiver with a "Y" harness, you probably wouldn't have this problem as the pulse voltage is higher. My guess you just had one servo that had a slightly dirty pot and with use it cleaned itself up enough to operate normal.
On your 517 receiver with a "Y" harness, you probably wouldn't have this problem as the pulse voltage is higher. My guess you just had one servo that had a slightly dirty pot and with use it cleaned itself up enough to operate normal.
04-01-2014, 03:04 PM
#32
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Check this out:
http://www.rcuniverse.com/forum/rc-r...ines-alot.html
13 years ago!
Back then they didnt wave, they whined.
http://www.rcuniverse.com/forum/rc-r...ines-alot.html
13 years ago!
Back then they didnt wave, they whined.
04-01-2014, 04:13 PM
#33
My Feedback: (19)
Check this out:
http://www.rcuniverse.com/forum/rc-r...ines-alot.html
13 years ago!
Back then they didnt wave, they whined.
http://www.rcuniverse.com/forum/rc-r...ines-alot.html
13 years ago!
Back then they didnt wave, they whined.
