Technical Topics > Equipment
Using the Earth as an Antenna
Sealord:
Dave Valko used a 315' BOG for most of his europirate catches with good results.
On the underground antenna thang, I always was intrigued by Robert Felix webpage:
http://www.borderlands.com/newstuff/research/FelixRadio/FelixRadio.htm
I don't have a tube rig to try his approach, but it sounds interesting.
Zoidberg:
--- Quote from: Sealord on November 07, 2011, 2230 UTC ---http://www.borderlands.com/newstuff/research/FelixRadio/FelixRadio.htm
--- End quote ---
Hey, that's one of the sites I used to have bookmarked but lost track of. Thanks for the reminder!
Pigmeat:
The copper rod antenna pictured there,is very similar to the ones I read about being used in the trenches in WWI.
In both Florida and the Yucatan cave divers are using modified CB radios to communicate with the surface and aid in tracking them. I've seen footage of it in action in the Yucatan. It looks like a Field Day Foxhunt on the surface. They're now experimenting with coil antennas on the receivers up top to increase ground penetration beyond the current 30-40 feet range in depth.
In the Yucatan many of the dive teams are funded by Universities as part of Archeological and Geological research. With even a small amount of grant money,it will be interesting to see how far they can push the communications technology.
paranoid dxer:
l
l
l
l------------------>
l radiator
l
l
counterpoise
intersection is feed point cut for freq of choice lay it on ground transmit in direction of arrow
very easy to setup and take up works well for transmit ;)
Swede P:
--- Quote from: Pigmeat on November 07, 2011, 1338 UTC --- From what I understand,talking to hams from that era,the range was very limited,a half-mile to a mile at best,depending on the soil and water table.
--- End quote ---
You are quite correct that the idea of passing radio signals through the earth can be done. I have experimented with electronics kits and have done that very thing in the garden, where both TX and RX were connected to separate copper pipes driven a few inches into the soil. However, whether that substantiates the claim that one can connect his receiver to the earth as a way of picking up signals off the air (literally) from shortwave stations around the world and that it works better than an aerial is very much in question.
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