RG-8X or RG-213 for a 50 foot run? - SailNet Community

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Old 05-23-2012
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RG-8X or RG-213 for a 50 foot run?

I need to rewire the coax in my mast, and the run from the radio to the top of the mast is about 48 feet. RG-8X or RG-213? I've looked at the charts, but I don't know "loss" from my ear. I just want the radio to work.

Is 213 overkill? I had what looks like RG-8, and it fits through my deck fitting well. For 213 with an OD of 10mm I'd need to figure out something different.

Thanks!
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Old 05-23-2012
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Re: RG-8X or RG-213 for a 50 foot run?

RG-8X will be fine.
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Re: RG-8X or RG-213 for a 50 foot run?

RG-8X has much more loss than RG-213. At marine VHF frequencies, it's loss is 4.8db for 100' (a 3db loss would cut the power in half).

I'd use RG213 or RG214. Or, even better, LMR400 which has a 1.5db loss per 100 feet.

BTW, RG213 and RG8 are the same diameter.

Bill
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Re: RG-8X or RG-213 for a 50 foot run?

A run of RG-8x should not exceed 80'.
I just replaced my antenna wire in my mast with 60' of RG-8x and I have not noticed any difference from my old wire.
On a good day I can still hit Seattle Wa. from Canoe Cove B.C., clearly.
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Old 05-23-2012
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Thumbs up Re: RG-8X or RG-213 for a 50 foot run?

Quote:
Originally Posted by btrayfors View Post
RG-8X has much more loss than RG-213. At marine VHF frequencies, it's loss is 4.8db for 100' (a 3db loss would cut the power in half).

I'd use RG213 or RG214. Or, even better, LMR400 which has a 1.5db loss per 100 feet.

BTW, RG213 and RG8 are the same diameter.

Bill
We used LMR400.
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Hmm. I thought I had rg-8 now. It is about a quarter inch od. Back to the boat to look.
I called Icom this afternoon and they recommended LMR400.
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Old 05-24-2012
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Re: RG-8X or RG-213 for a 50 foot run?

Quote:
Originally Posted by btrayfors View Post

BTW, RG213 and RG8 are the same diameter.

Bill
I'm no expert at all here, but I'm fairly sure RG213 has a larger diameter than RG8x. May want to double check that.
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Old 05-24-2012
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Re: RG-8X or RG-213 for a 50 foot run?

RG-8 (sometimes listed as RG-8/U, or RG-8U) and RG-8x are two very different types of coax. RG-8/U is the same diameter as RG-213 (.405"), while 8x is much smaller (.242"). RG-8/U is also much closer to 213 in terms of loss, while 8x suffers almost twice the loss per 100 feet.

So, you have to be really careful to be clear about which variety of "8" you are talking about.
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Old 05-24-2012
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Re: RG-8X or RG-213 for a 50 foot run?

Quote:
Originally Posted by GMFL View Post
I'm no expert at all here, but I'm fairly sure RG213 has a larger diameter than RG8x. May want to double check that.
RG8 and RG8X are NOT one in the same. 8X is considerably smaller than RG8... 8X is only marginally larger than RG58U....

This is RG-213 vs. RG58U.


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Re: RG-8X or RG-213 for a 50 foot run?

There you go, learnt something new.
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