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What is this thing on my VHF Power Cord?

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What is this thing on my VHF Power Cord?

Old 09-01-2011, 07:56 AM
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Default What is this thing on my VHF Power Cord?

Can you guys tell me what this thing is my VHF power cord?

What purpose does it serve?

It looks like a magnet inside.
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Old 09-01-2011, 08:04 AM
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It's a filter. It filters.
Old 09-01-2011, 08:06 AM
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Filters what?
Old 09-01-2011, 08:22 AM
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Electrical noise.
http://en.wikipedia.org/wiki/Ferrite_bead
Old 09-01-2011, 08:24 AM
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No random static or other electrical interference from other electronics. They are nice to have, I would keep it on there.

Keith
Old 09-01-2011, 08:29 AM
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It is a Ferrite RF Choke, used to eliminate stray RF. On a boat it is best to be put on every piece of electronics.
Old 09-01-2011, 08:32 AM
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It is a ferrite core for EMI (electromagnetic interference) rejection.

Eric
Old 09-01-2011, 09:03 AM
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Originally Posted by Jerryh3 View Post
Yep.
Old 09-01-2011, 09:03 AM
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Originally Posted by dowop View Post
It is a Ferrite RF Choke, used to eliminate stray RF. On a boat it is best to be put on every piece of electronics.
Yes, and the look on the girl's face at Radio Shack is precious when you go in and ask her for one.
Old 09-01-2011, 10:36 AM
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Thanks guys!! I'll leave it on.
Old 09-01-2011, 10:59 AM
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Originally Posted by rwidman View Post
Yes, and the look on the girl's face at Radio Shack is precious when you go in and ask her for one.
not if you ask for it by number.
Old 09-01-2011, 11:12 AM
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Originally Posted by t3rockhall View Post
not if you ask for it by number.
But they don't have paper catalogs anymore and the website can be a little less than optimal.

I asked one time for a "rechargable "C" cell" and the girl asked me if it was for a cell phone.

I said, "Never mind, where are the batteries?"
Old 09-01-2011, 11:28 AM
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How many of my fellow electronics geeks new what it was going to be before opening the thread
Old 09-01-2011, 11:49 AM
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I knew it, so I didn't even open the thread.
Old 09-01-2011, 01:23 PM
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radio Amature for 25 years....worth there wt. in gold ( well maybe silver today) around the radio room...
Old 09-01-2011, 08:17 PM
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Originally Posted by ak_j View Post
How many of my fellow electronics geeks new what it was going to be before opening the thread
Old 09-02-2011, 04:30 AM
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Is there any place they should not be used? Flux compass cabling? Put one on all electronics cables?
Old 09-02-2011, 05:33 AM
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The ARE made of ferrite (iron), so they should be kept away from a magnetic compass.
Old 09-02-2011, 05:51 AM
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Originally Posted by millennium View Post
Is there any place they should not be used? Flux compass cabling? Put one on all electronics cables?
As mentioned, they are made of iron so stay away from the compass or anything else that might be affected.

"Put one on all electronics cables?" - No. There's no need for a choke unless you're having problems with interference. Even then, there's no guarantee that a choke will solve the problem. If the interference is traveling in the cable, the choke may help. If it's being broadcast through the air, it will not help at all.
Old 09-02-2011, 11:14 AM
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These teroid chokes have their purpose of cleaning up that unwanted ac/rf signal caused by a faulty alternator pumping out ac with the dc or that coax radiating as a antenna instead of a feedline. I'm old school back from the tube type era and think priority should be focused on finding the source and attempting to stop it there first. If the source is causing problems on one device it has to cause problems to others as well. Good thing to have a dual trace oscilloscope to see that ac superimposed alone with the dc.

I'm also a amateur radio and monitor my signal for a pure clean sine wave, and try my best to clean up all the stray rf as well.

Charlie

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