Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 28-11-2009, 17:34   #1
Registered User

Join Date: Nov 2008
Location: Seattle
Boat: Wauquiez Centurion 49
Posts: 664
Images: 13
Reducing RF Interference

I am installing a new SSB with a designated battery. The wire from the battery to the transceiver is 4ga. Other than ferrite chokes, are there any other things I can do to reduce RFI? What about a helical twist on the wires for their 17 ft run?


CAELESTIS is offline   Reply With Quote
Old 28-11-2009, 22:51   #2
Certifiable Refitter/Senior Wannbe
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 6,324
Well you could screen them if you really wanted to - run them inside the braid of say RG8 and ground the braid but unless you have a real serious RFI problem, I won't bother.

Just keep them away from other cable runs (even if only a inch or so).

All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 29-11-2009, 01:03   #3
CF Adviser
Moderator Emeritus
Hud3's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: Virginia
Boat: Island Packet 380, now sold
Posts: 8,847
Images: 47
Jim Corenman (of Airmail fame) has published a pretty good write-up on taming RFI. He advises paying attention to your grounds. Here's a link...

RF Interference
Hud3 is offline   Reply With Quote
Old 29-11-2009, 06:15   #4
Registered User

Join Date: Nov 2004
Location: Currently based near Jacksonville FL; WHOOSH's homeport is St. Pete, FL USA
Boat: WHOOSH, Pearson 424 Ketch
Posts: 591
+1 for using Jim Corenman's Pactor Primer and RF Interference guidelines. He is a (if not 'the') guru on this stuff.

Note the rec for the large T-4 choke (line isolator) that is recommended. Inexpensive and effective.


WHOOSH, Pearson 424 Ketch
Euro Cruiser is offline   Reply With Quote
Old 03-12-2009, 09:25   #5
Registered User

Join Date: Sep 2008
Location: Camden, ME
Boat: A Thistle, a Catalina 22, and a Valiant 40
Posts: 614
If you are running a dual conductor cable with ground and +12v right next to each other, you won't have trouble with "differential" mode RFI or ground loops. You could get "common mode" RFI on the power cables in that situation, but I doubt it would be a problem. Best thing to do would be to try it and see if more aggressive steps are necessary. If "common mode" RFI turned out to be a problem, you could buy some ferrites of the right size to go over the cables to attenuate it.
SoonerSailor is offline   Reply With Quote


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
Inverter Interference Salacia Electrical: Batteries, Generators & Solar 17 05-05-2011 11:23
Interference on My FM Radio cdulaney146 Powered Boats 6 15-07-2009 18:40
Reducing Engine/Generator Time for Charging Frank4 Electrical: Batteries, Generators & Solar 0 21-07-2008 18:41
Reducing sail with roller furling main? jackdale Monohull Sailboats 3 30-04-2008 11:34
Reducing the number of forums Gisle Forum News & Announcements 5 24-05-2003 22:50

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 00:30.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.