[Boatanchors] Burying Coax

[rbethman]

Keith,

I would first of all use a double shielded coaxial cable.

The "VLF" frequencies, especially the 60 cycle ones, will get to you 
even IF you bury the coax.

This is the entire basis of VLF communications used in the Navy to 
communicate with submarines.

You can attempt various schemes to shunt these signals,, but risk 
killing the very range that you are trying to pick up.

It becomes a conundrum.  It danged if you do and danged if you don't.

Your best bet is a system designed to remove unwanted 60 cycle by a 
network that is tuned specifically to that range, inside the shack.

My $0.02.

Bob - N0DGN

On 12/8/2011 9:51 AM, Keith Densmore wrote:
> Thanks to all you great guys with the information on the ditch witch. Sounds
> like that will do it. Glad there is a machine for that, hi.
>
> But a couple of you mentioned that burying coax will not lower noise pickup.
> Which has caused me to put this plan on hold. I need to know more.
>
> I 'thought' coax to be a good insulator of noise but not perfect. My belief
> is or was that the outer shield forms a capacitor with the inner conductor
> and therefore a noise signal on the outer braid will to some extent
> capacitivily couple itself into the center conductor. In my case the antenna
> is in a low noise location but the coax runs through a noisier area. I
> listen to 40 meters down to VLF, VLF being very prone to AC line noises.
>
> Anyone know for sure?
>
> Thanks, 73,
> Keith
>