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Questions tagged [earth]

Questions about the surface of the Earth as it affects radio propagation and antenna system design and installation. For questions about RF grounds and shields, counterpoises, virtual grounds, etc. use [grounding] instead unless the question is particularly about soil properties or similar details.

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Can I use electrical ground / earth as my RF ground?

I live on a high floor in an apartment block and have a radial-free multi-band vertical antenna attached to my terrace railing. This is the antenna :
Engineer999's user avatar
5 votes
2 answers

How do I interpret the FCC ground conductivity map files?

The FCC has .seq files that show ground conductivity which it makes available for download. Unfortunately, there doesn't appear to be any documentation that comes with the files, or even headers. I ...
user3486184's user avatar
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7 votes
3 answers

Passively reducing ground loss?

Would a disconnected wire or conductive mat below a low height antenna reduce ground losses? A tuned length of wire under a wire antenna might be suitable for NVIS gain. But would a bunch of space ...
hotpaw2's user avatar
  • 13.5k
4 votes
1 answer

High-resolution GIS datasets of groundwave conductivity of the United States, besides the FCC?

The FCC publishes a map of estimated groundwave conductivity of the United States, but the resolution is quite low: Are there any GIS datasets that include groundwave conductivity at a higher ...
Michael A's user avatar
  • 185
1 vote
2 answers

Counterpoise/ground/radial options for an Inverted L

I have two 10-meter masts to support a 40-meter inverted L. I have a decent enough sized yard that I have a few options for counterpoise/ground/radial. I could run 1/4 wave radials in several ...
K8KV's user avatar
  • 377
3 votes
3 answers

How thick should counterpoise wires be?

I would like to use a shortened whip antenna with a coil in it's base, e.g. OPEK HVT-400B. My transceiver maximum power is 100 W (and antenna's - 120 W). To make the antenna work I need counterpoise ...
Aleksander Alekseev - R2AUK's user avatar
2 votes
2 answers

Ground radials: Electrical difference between 14 gauge and 18 gauge? Lifespan difference?

I am starting the process of installing a vertical ant (6BTV) and radial ground system. I am ready to buy the wire. I would like to know if there is an electrical difference between 14 gauge and 18 ...
MarqTwine's user avatar
  • 191
3 votes
2 answers

Not-too-distant saltwater ground

Problem I'm planning on mounting a vertical HF multiband antenna on the edge of my roof. Due to the presence of a paved walkway and some other similar property constraints, I have no room for ...
Eric's user avatar
  • 133
4 votes
1 answer

How Does the Performance of Elevated Radials Differ from That of Buried Radials?

NEC4.2 provides some information about this topic that may be of interest to some readers.
Richard Fry's user avatar
  • 2,922
5 votes
2 answers

How can Ground Penetrating Radar work?

I was reading about GPR devices recently. Considering the operation frequency of these devices, how they can go that deep (up to 50 feet)? Normally you would only expect a Hz to KHz range signal to ...
Samk80's user avatar
  • 65
5 votes
1 answer

Does geology affect radio signals?

following on from an earlier question about Iron Ore affecting radio waves... are there any other geological properties that can affect radio waves? Are certain frequencies more susceptible to ...
Diatu's user avatar
  • 51
7 votes
5 answers

Using Earth as an RF ground

I have built a simple ground plane antenna for 70cm with a connector, 4 radials, and one vertical element. The RF ground is connected to the radials, and the RF is connected to the vertical. It got ...
Skyler 440's user avatar
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11 votes
6 answers

Does iron ore in the ground affect my signal?

Mineral content in the ground varies from one place to another. I've visited places where the ground & waters were an orange-red shade from the high iron content; not good for trees either. This ...
VU2NHW's user avatar
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