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Old 06-06-2020, 06:19   #16
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Re: VHF ground to sea cock

You can connect it to the ground plate of the boat, where the mast is connected to as lightning protection.
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Old 06-06-2020, 06:21   #17
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Re: VHF ground to sea cock

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Originally Posted by SVHarmonie View Post
Some seacocks will have a screw terminal on them that can be used with a ring terminal on the bonding wire. Absent this, a hose clamp works well.
Hose clamps are stunningly bad electrical connectors.

What the posts here are missing is that almost all VHF radios have floating power inside the case. The 0V power input (black, "ground," "earth") is not connected to the case. For a metal case radio or one that has metal covers over parts of the electronics a ground stud will reduce interference from the radio on other systems and from other systems on the radio.
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Old 06-06-2020, 06:31   #18
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Re: VHF ground to sea cock

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Here are the instructions. It’s for a ICOM 330G

You will note that connection #3 is for positive and negative DC. Then connection #5 calls for a ground wire.

The question is where to run that ground wire.

I probably should have posted this with the original post.
You connect that ground to the battery negative, it’s an audio shield ground I’m pretty sure

I would not connect it any metal part submerged in salt water, especially if the part was not bonded to a protective anode.
Many, or most electronics even car stereos have chassis grounds. It’s sort of like the third prong on an AC electric plug.

Audio Grounding Schemes
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Old 06-06-2020, 07:03   #19
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Re: VHF ground to sea cock

In all likelyhood the ground wire is for lightning discharge/ protection (and to keep the Icom legal depth happy). The coax shield is electrically connected to the radio chassis, so connect the chassis to seawater. Ground plate first choice, engine second, thru hull third. As to the wire being a RF ground, at 150 Mhz not likely.


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Old 06-06-2020, 16:45   #20
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Re: VHF ground to sea cock

Quote:
Originally Posted by Tmacmi View Post
Here are the instructions. Itís for a ICOM 330G

You will note that connection #3 is for positive and negative DC. Then connection #5 calls for a ground wire.

The question is where to run that ground wire.

I probably should have posted this with the original post.
Leave it unconnected - it is simply not needed on a fibreglass recreational boat.

It's purpose to keep the metal case of the radio at the same potential as other metal cases of other equipment and the metal mounting racks and cabinets which you will find on a ship etc.

If you have rack mounted equipment, the rack will already have it's own bonding grounds and this #5 wire should be connected to the rack bonding common point.

However it serves no function otherwise.
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Old 06-06-2020, 20:54   #21
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Re: VHF ground to sea cock

I agree with Wotname above.

If connecting it I would connect it to the DC negative bus. I would never connect to a bronze through hull.

I'm not a fan of bonding through hulls to anything.
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Old 07-06-2020, 15:33   #22
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Re: VHF ground to sea cock

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Originally Posted by Tmacmi View Post
Here are the instructions. Itís for a ICOM 330G

You will note that connection #3 is for positive and negative DC. Then connection #5 calls for a ground wire.

The question is where to run that ground wire.

I probably should have posted this with the original post.
If you want uninterrupted reliable service from your VHF, you should connect it directly to the Positive and Negative directly at the battery terminals. If the wiring does not reach the battery... add more wiring... #10 gauge recommended.
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