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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> y choke
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y choke - 4/29/2002 4:16:09 AM   
TeePee


 

Posts: 61
Joined: 12/9/2001
From: Palmetto, GA, USA
Status: offline 		What is a choke for in a servo Y harness. TeePee












Remember: throttle controls altitude- elevator controls airspeed!
       Post #: 1

y choke - 5/1/2002 1:52:38 AM   
Ladyflyer



Posts: 1035
Joined: 1/13/2002
From: North Am, PA, USA
Status: offline 		A Y choke is usually a harness with one input and a pair of output connectors to allow driving 2 servos from one channel.

The "choke " part refers to an RF absorptive device to block stray RF currents that may be traveling along the conductors.Especially long cable runs.
The chokes may be in the form of small ferrite "beads" that have the wires pass thru them or they may be small coils tuned to exclude a range of frequencys.
The chokes are "passive in that they require no power to speak of for operation and are therefore not prone to failure'

A couple other methods to reduce the ill effects of stray RF currents are "buffers" and "isolators".
The Buffers are small amplifiers that boost the signal to the servo and by improving the ratio of signal to noise they lessen the effects of noise on the signal line, They are active and become another link in the chain. And while extremely reliable they are a potential point of failure that could cause loss of control on the affected channel.
The Isolators are usually a photo sensitive receptor driven by a light source that is modulated by the receiver servo output. The output from the Isolator is electrically divorced from the controls and thus stray currents are diminished.
Again these are active devices and CAN fail.

They all work in slightly different ways and sometimes a combination of two may be needed.

The bottom line is still parts that aren't there dont break, so if you don't really need the active type devices you have increased your system reliability. The chokes are very reliable and not at all a bad move .

Of course it is still best to locate and eliminate noise sources whenever possible.

Hope this helps

_____________________________

LF
When they have to say "NO FEAR" it really means NO SENSE.

(in reply to TeePee)
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