Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-02-2015, 06:18   #16
Registered User

Join Date: Oct 2010
Location: The boat - New Bern, NC, USA; Us - Kingsport, TN, USA
Boat: 1988 Pacific Seacraft 34
Posts: 421
Re: 12v RF interference with FM radio

I have two 12vDC - 19vDC converters; one is an Itekiro, the other a PWR+. Both are noisy, interfering with broadcast FM and HF SSB when in use. I have been able to silence both by putting a clamp-on ferrite choke on the 12v and another on the 19v wire and also wrapping the brick in aluminum foil. The foil made a noticable difference. I intended to replace the aluminum foil with copper foil so that I could solder on a ground wire, but with the problem gone, I've never done it.

My clamp-on chokes are Fair-Rite 31 material from Mouser.com. The newer (and of course more expensive) 75 material may be a better option.
__________________

__________________
wsmurdoch is offline   Reply With Quote
Old 18-02-2015, 07:46   #17
Registered User
 
travellerw's Avatar

Join Date: Jan 2014
Location: Martinique
Boat: Fortuna Island Spirit 40
Posts: 1,726
Re: 12v RF interference with FM radio

If looking for a converter to run a computer, then the safest options is the manufacturer of that computer.

The big manufacturers (Dell, HP, Lenovo) should conform to all the rules and regulations. If so, the amount of noise emitted will be limited.

If buying from eBay or generic brands, I almost guarantee a noisy device.

Sent from my Nexus 4 using Cruisers Sailing Forum mobile app
__________________

__________________
travellerw is online now   Reply With Quote
Old 23-02-2015, 12:19   #18
Registered User

Join Date: May 2007
Posts: 11
Re: 12v RF interference with FM radio

Indeed it is the cheap off-brand dc converter causing my problem. No amount of ferrites or aluminum foil seems to make a difference, but it does seem to go away if I can get the converter more than a few feet away from the stereo. Looks like I'll either need to buy direct from HP, or extend the wiring and place the converter far away from the nav station.
__________________
Uliad is offline   Reply With Quote
Old 23-02-2015, 13:20   #19
cruiser

Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 4,669
Re: 12v RF interference with FM radio

Quote:
Originally Posted by Uliad View Post
Indeed it is the cheap off-brand dc converter causing my problem. No amount of ferrites or aluminum foil seems to make a difference, but it does seem to go away if I can get the converter more than a few feet away from the stereo. Looks like I'll either need to buy direct from HP, or extend the wiring and place the converter far away from the nav station.
What if you just move the stereo's antenna away from the converter?

Of course, the antenna would have to have a shielded cable between it and the stereo. If your antenna is just a piece of wire with a plug attached that will not work.
__________________
rwidman is offline   Reply With Quote
Old 23-02-2015, 13:39   #20
Registered User

Join Date: Jul 2013
Location: San Diego, CA
Posts: 3,157
Re: 12v RF interference with FM radio

Quote:
Originally Posted by Uliad View Post
Indeed it is the cheap off-brand dc converter causing my problem. No amount of ferrites or aluminum foil seems to make a difference, but it does seem to go away if I can get the converter more than a few feet away from the stereo. Looks like I'll either need to buy direct from HP, or extend the wiring and place the converter far away from the nav station.
Another option is to buy an aluminum enclosure that's a few inches larger than the converter. Drill a hole in it at each end for the power wires to pass through. Attach a ground wire to one of the screws and attach it to the ground wire on the 12v side.

When you pass the power cable through the ferrite clamp, play around with the number of turns. Try 1, 2 and 3 turns and see which one is most effective.
__________________

__________________
socaldmax is offline   Reply With Quote
Reply

Tags
enc, interference, radio

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I still get 12V from two 12V batteries in series Mikado Electrical: Batteries, Generators & Solar 26 29-10-2014 19:48
Radio Interference Akapeterc Monohull Sailboats 2 17-02-2014 09:53
12v questions...simple 12v socket. rhr1956 Construction, Maintenance & Refit 13 29-08-2012 08:42
MPPT Controller Radio Interference witzgall Marine Electronics 7 08-09-2009 14:26
Interference on My FM Radio cdulaney146 Powered Boats 6 15-07-2009 19:40



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:28.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.