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vhf radio interference

 
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Hellsranger



Joined: 30 Oct 2017
Posts: 22
City/Region: Bellingham
State or Province: WA
C-Dory Year: 1991
C-Dory Model: 22 Cruiser
Vessel Name: Golden Heart
Photos: Golden Heart
PostPosted: Sat Aug 18, 2018 1:05 pm    Post subject: vhf radio interference Reply with quote

When my VHF is on and the engine (91 Johnson 70)I get a buzzy ticking interference. The speed of the ticking seems correspond to the RPM of the engine. Could it be bad plug wires? I'm hoping to get some input here as I'm basically not able to use the radio while under way, its just too annoying.
Thanks - Mac

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DW



Joined: 07 Sep 2017
Posts: 43
City/Region: Mount Vernon
State or Province: WA
C-Dory Year: 2004
C-Dory Model: 22 Cruiser
Vessel Name: Wicked Pissah
PostPosted: Sat Aug 18, 2018 1:38 pm    Post subject: Reply with quote

Considering the age of the wires, sounds like a good start to replace the wires first. If the issue continues, using Ferrites could help. You'll have to find someone smarter than I, but the basic concept is to add ferrites until the interference disappear.
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ssobol



Joined: 27 Oct 2012
Posts: 3358
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
PostPosted: Sat Aug 18, 2018 4:16 pm    Post subject: Reply with quote

It depends on whether the ticking is noise in the electrical system or is RF noise picked up by the antenna.

For electrical noise you can get an isolation transformer that goes on the radio power input.
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srbaum



Joined: 30 Aug 2010
Posts: 875
City/Region: Portsmouth
State or Province: VA
C-Dory Year: 2007
C-Dory Model: 26 Venture
Vessel Name: Osprey
Photos: Osprey
PostPosted: Sat Aug 18, 2018 5:51 pm    Post subject: Reply with quote

A lot of my older 2 strokes made radio noise until I changed spark plugs to fix the issue. Here is one example at boats.net that may help solve the problem https://www.boats.net/product/johnson/0432424?ref=d856d1c6c2f9a3c1b55bc3c7e90d8acfd29de9a6
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Barry Rietz



Joined: 21 Jun 2006
Posts: 409
City/Region: Sierra Vista
State or Province: AZ
PostPosted: Sat Aug 18, 2018 10:08 pm    Post subject: Radio Noise Reply with quote

You might try to find a set of "iridium" spark plugs and a new set of "resistor" type plug wires. (the hot rod shops have these items)
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