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post #1 of 5 Old 11-21-2008 Thread Starter
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VHF Coax AWG

What is the average gauge coax cable used for VHF radio.
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Guage is really n/a when it comes to coax. What you use depends on the Ohms (typically either 50 or 75) and the distance you need to run it. Refer to the recommendations of the radio and antenna.
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Tqxin,

Not sure exactly what you're asking.

Coax used for VHF comes in several flavors. For shorter runs (say, under 30' or so total), RG8X is often used. It's about the same diameter as RG58, but has better loss characteristics at VHF frequencies.

For longer runs, it's better to use a coax with lower loss at VHF frequencies. RG8 is the old standard, but there are better ones available, including RG213 and, my favorite, RG214. Even lower loss coax types are available, but are costly and probably overkill for most installations.

Does this help?

Bill
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The two types of Coax cable used in Marine applications are RG-8x or RG-213 IIRC. The RG-213 is much heavier, more expensive, but has a lower loss per foot.

edit: damn, Bill beat me to it.

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post #5 of 5 Old 11-21-2008
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VHf Coaxial cable choices

Quote:
Originally Posted by 14432 View Post
Guage is really n/a when it comes to coax. What you use depends on the Ohms (typically either 50 or 75) and the distance you need to run it. Refer to the recommendations of the radio and antenna.
14432 is correct that guage is not applicable when talking about coax and it comes in 50 and 75 Ohms Impendance. 50 Ohm Impedence is for VHF service, while 75 Ohm impedance is for television antennas and cable service.
In general the thicker the cable insulation the less loss there is to the signal.

There are five types of coaxial cable found on boats:
RG-58/U is thin (3/16" OD) and used for short runs to connect electronics etc
RG-59/U (75 Ohms Impedance, 1/4"OD) Used for Cable and TV antenna work.
RG-8X (50 Ohm Impedance, 1/4" OD) is common for VHF and HF work up to a point where signal loss (attenuation) is too great because of cable length
RG-8/U ( 52 Ohm Impedence) and RG-213 (50 Ohm Impedence) are used to get max power to the antenna for both VHF and HF service. Both are about 13/32" in OD

This does not cover all of the cables but should give you a good start and check to see what your radio and antenna require and also what the cable manufacturer says as well. You will also have to pay attention to how much bend radius you can put in the cable.

You will also want to use marine grade connectors matched to the type of cable you are using.
Pay attention to your materials and equipement and you will have an install which will give you the best performance.

John

"It's not just about the vessel... more importantly it is about the people, their safety and their vessels in that order. "(PFJ 1952-1986)

Last edited by JHJensen; 11-21-2008 at 05:18 PM.
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