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Old 28-07-2013, 15:27   #16
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Re: Looking for DC-Block for PL259

the bounding wire on the keel / mast should be tied to DC neg at the main neg bus down below anyways. so this path should be there anyways.

though you can buy antennas that are isolated from their mount. you could also buy a plastic mount, but it'll be weaker.
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Old 16-07-2016, 16:10   #17
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Re: Looking for DC-Block for PL259

Any progress on this? I also want to ground my masts to a seperate grounding plates, and I'm concerned about this same issue, and can't find these DC blocks online...
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Old 17-07-2016, 05:58   #18
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Re: Looking for DC-Block for PL259

Polyphaser makes UHF DC blocks with gas discharge lightning protection. Not cheap...

https://www.dxengineering.com/parts/ppr-is-50ux-c0
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Old 17-07-2016, 09:05   #19
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Re: Looking for DC-Block for PL259

Thanks, I was actually looking at these yesterday.... It seems like they only block the center pin (inner) while I'm looking to block the outer, ground, to prevent corrosion.

I reached out to their tech support. I'll post back here if I find something useful. Cheer,
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Old 17-07-2016, 16:02   #20
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Re: Looking for DC-Block for PL259

Quote:
Originally Posted by hlev00 View Post
Why do we have this problem? The mast is grounded to our iron keel, the antenna mount and base are not insulated from the mast. This results in our keel being electrically connected to the boat's ground, including our prop.
most boats are like this...
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Old 18-07-2016, 07:42   #21
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Re: Looking for DC-Block for PL259

I'm mainly going off of what I read here. As an EE, this all makes good sense to me, and I like to be prudent. I've also cross checked this against a book on the topic and a couple other resources that seem to align. So really just trying to do all the best practices in hopes of preventing any corrosion issues.

Marine Grounding Systems | West Marine
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Old 18-07-2016, 07:54   #22
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Re: Looking for DC-Block for PL259

I got confirmation from the techs here... This will do it.https://www.dxengineering.com/parts/ppr-is-50ux-c0
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Old 18-07-2016, 21:21   #23
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Re: Looking for DC-Block for PL259

My suggestion is if this is truly a valid concern then get a different antenna that has its own ground plane or matching stub.

As an example, the Shakespeare 5104 is 48" long and has 3db of gain in addition to being electrically isolated from whatever it is attached to, so no sort of isolation blocks are needed. Another benefit is the entire antenna will be cheaper than what a quality grounding block would cost.
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