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Search took 0.00 seconds. Search: Posts Made By: Dockhead
Forum: Monohull Sailboats 05-10-2020, 22:43
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

:thumb:


Best post of the thread -- all words to live by.
Forum: Monohull Sailboats 05-10-2020, 08:42
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

The article is interesting, but it's not written by a radio engineer. There are a few things which can be disputed. I've seen enough LMR400 cable ripped out of masts to say that you really don't...
Forum: Monohull Sailboats 03-10-2020, 12:04
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

Low power on most fixed mount marine VHF sets is 1 watt, not 5 watts. From 25 watts to 1 watt is 25x less. From 25 watts to 5 watts is 5x. Those are big enough differences to make a difference. ...
Forum: Monohull Sailboats 01-10-2020, 20:32
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

Well, if you don't want to discuss it, that's fine. But 20% loss of power out of 25 watts is really meaningless and NOT detectable, for the same reason the same loss of sound power is meaningless...
Forum: Monohull Sailboats 01-10-2020, 01:49
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

Sorry, but both sound and electromagnetic waves follow the inverse square law.

Now marine VHF is frequency modulated so there is the Capture Effect to consider, but this effect is determined by...
Forum: Monohull Sailboats 30-09-2020, 14:48
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

The power function directly translates. He's right. And that's why we use dB for both.



20% is very unlikely to make the difference you say. 300% or 400% -- maybe.
Forum: Monohull Sailboats 30-09-2020, 14:02
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

:thumb: I am also a radio amateur (extra class), and this post contains the truth of the matter. :thumb:
Forum: Monohull Sailboats 29-09-2020, 13:32
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

OK, then -- so how much will it radiate at the antenna? And how much is actually needed? How much is "enough"?


Don't get me wrong -- I do have RG214 in my own installation. I took the trouble...
Forum: Monohull Sailboats 29-09-2020, 12:50
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

You should get more range and more years that than. Good luck!


Range depending very much on the height of the other antenna -- keep that in mind.
Forum: Monohull Sailboats 29-09-2020, 12:46
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

When 1 or 2 or even 5 watts is fundamentally enough, losing 20% out of 25 watts is -- no big whoop. Really.
Forum: Monohull Sailboats 29-09-2020, 11:06
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

I would hire a pro for this.


Otherwise learn how to solder them on. It's something of an art, and be prepared to redo it multiple times until you get it right.


Use top quality connectors...
Forum: Monohull Sailboats 29-09-2020, 10:53
Replies: 52
Views: 9,640
Posted By Dockhead
Re: Coax cable for long run up mast

LMR is total overkill (and has a foam, not solid insulator, vulnerable to crushing and water intruction -- do not use on a boat). RG-213 is overkill too (I admit that I have RG-214, but my mast is...
Showing results 1 to 12 of 12

 
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