When our RC plane gets air borne(in flight or even lay on table), the stock
wire antenna will become 50% of the antenna of a dipole antenna model. The
remaining part of antenna is the remainding wires such as servo cables and
their extension if applicable. Once this is accepted as "the antenna", we
can easily see that part of Rx antenna (system) is connected to a noisy
servo at the far ends. Any noise in the servo will become part of the Rx
input signal. Therefore, the Rx signal will be attenuated nearly equal in
scale as to the servo noise, if indeed ferite proven to be effective. In
other words, placing ferrite beads at the stock wire antenna side produce
no significant difference as to the servo side. The difference lives within
ones conception or perception.
Servo glitching does not always a result of interference to Rx by its own
servos. Excessive surge voltege drop as a result of stall motor current in
servo is another cause. Stall current in motor at zero RPM at t=0, counting
up. Stall current can be 10 to 20 times of no load current. Some servo
glitch problem were actually solved by voltage drop compensation with a 5th
cell in a 4 cell system. My servo glitching problems were solved by
rearrange the linkage to ease loading of servo or upgrade 4 cell to 5, or
both. (note: some but all Rx will produce adverse effect into 5 cell
operation, I am sure you can rule in/out with an experiment, to your
advantage).
Hope that help.
YK
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