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Most Unique Antenna Installation Ever...

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DeoVindice

P25 Underground
Joined
Sep 27, 2019
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461
Location
Gadsden Purchase
Ugx78pi.jpg

That's a seven-element yagi antenna aimed down a seventy-degree inclined shaft at a gold mine in New Mexico. Their radio installation uses a base station and repeater at the hoist house, a yagi covering the shaft, and leaky feeder coax to provide coverage underground. They've got probably a thousand feet of serviceable workings with more older, abandoned areas, and good signal throughout. Given how harsh the environment is, Retevis handhelds are being used since they're essentially disposable. I did spy an HT1000 in the hoist house, though.

rRkiH5e.jpg

This is the headframe. The shaft runs just over three hundred feet vertically. I was there consulting on safety and planning issues.
 

vagrant

ker-muhj-uhn
Premium Subscriber
Joined
Nov 19, 2005
Messages
3,186
Location
California
Thanks for this. It had me research leaky coax types, cost, etc. My guess over the years was reasonably close, but facts are better. I still need to review installation examples in buildings and ships. I’m also curious about installation standards. Time for more reading.
 

a417

Active Member
Joined
Mar 14, 2004
Messages
4,669
Side lobes? Nah, we're not gonna worry about side lobes.
 

prcguy

Member
Joined
Jun 30, 2006
Messages
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Location
So Cal - Richardson, TX - Tewksbury, MA
When we learn to control Neutrinos we will be able to talk through the earth and everything else.

A friend of mine designed a communications and direction finding system I think in the 80KHz range with high power audio amplifiers as the transmitters and a bicycle wheel with hundreds of turns of wire as the antenna. It worked hundreds of ft underground and the loop on the surface could be tilted for best signal to pinpoint the antenna underground. The antenna underground was balanced on a stand so it always sat perfectly horizontal.


I wonder if there will ever be a 'through the earth' (to the other side of the world) QSO.. It would take a lot of power I bet. :)
 
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