Formap
04-23-2008, 11:14 AM
I have an Align RCE-BL25G/35G ESC for my Trex 450.
it did not come with a ferrite ring attached.
I'm using a DX7 TX, but Align doesn't know that.
What is the ferrite ring for and why would one ESC requitre a ferrite rnig while another doesn't?
Thank you.
BarracudaHockey
04-23-2008, 11:43 AM
It keeps electrical noise from the ESC from getting into your reciever via the throttle channel. I'd get one and run them as a habit on all my electrical setups.
Skarn
04-24-2008, 11:01 AM
+1
What he ^^^ said.
Skarn
jeffk
04-28-2008, 10:05 AM
The powdered iron that makes up a ferrite ring can absorb radio frequency (RF) energy. Some ESCs emit this RF energy, which can interfere with the sensitive electronics in the receiver. The leads from the ESC to the servo offer an ideal path to transmit RF energy directly into the receiver, so some manufacturers install a ferrite ring with 2 or three wraps of the servo wire around it , on all of their ESCs. The ring absorbs any stray RF that appears on the servo leads and thus keeps it from getting into the receiver.
Some ESCs are "cleaner" than others, meaning that they emit less RF energy, and as a cost-cutting measure, the manufacturers do not include a ring. Also, some receivers (like the Spectrum AR series 2.4Ghz models) are not as sensitive to RF interference, although if enough is present, even they will be affected by it.
To that end, it's well worth the effort to install a ferrite ring when one isn't provided by the ESC manufacturer. The cost and effort are both minimal, and the benefit is great. It's one of those "better safe than sorry" things.