home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!noc.near.net!hri.com!spool.mu.edu!uwm.edu!ogicse!sequent!muncher.sequent.com!patch
- From: patch@sequent.com (Pat Chewning)
- Newsgroups: rec.models.rc
- Subject: Re: What is a ferite bead?
- Message-ID: <1993Jan7.010850.4044@sequent.com>
- Date: 7 Jan 93 01:08:50 GMT
- References: <1993Jan6.205946.10039@aio.jsc.nasa.gov>
- Sender: usenet@sequent.com (usenet )
- Organization: Sequent Computer Systems, Inc.
- Lines: 22
- Nntp-Posting-Host: crg1.sequent.com
-
- In article <1993Jan6.205946.10039@aio.jsc.nasa.gov> careyb@dallas.jsc.nasa.gov (Brian Carey 283-4181) writes:
- >
- >What is a ferite bead? The one talked about below.
- >
- >The "Y" harness might be acting like an antenna and causing interference
- >with the receiver. I have had this problem and fixed it by running the base
- >of the "Y" cable through a ferite bead (one turn) to choke off the RF. This
- >worked with an airtronics receiver. When I install servos in the wings of
- >my gliders I go ahead and put the ferrite bead in every installation and
- >have not had any problems since.
-
- A ferite bead is a donut shaped bead made from ferite. Ferite is a compound
- of iron and carbon (FeC3 I think). When wires are wound around the ferite
- bead (through the center, around outside, and back through center), the bead
- increases the inductance of the wire and is used to supress higher
- frequencies on the wire. In this example the ferite bead is being used as
- an RF choke to reduce the RF noise generated and received on the servo
- leads.
-
- I obtained my ferite beads at Norvak Electronics, a local electronic parts
- store. They might be available from Radio Shack and other electronic part
- stores.
-