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Zenneck Waves: How to make.




 
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Author Topic: Zenneck Waves: How to make.  (Read 522 times)
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WA4WAX
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« on: October 31, 2017, 02:16:33 PM »

This might be a starting point.  Doublet probes for generating Zenneck Surface waves. 

Someone ought to try this out in the 160 to 190 KHz band.......or even on 160!

These waves are the basis of Tesla's longitudinal electricity. They are guided waves.  They are not Herzian waves.

https://patents.google.com/patent/US20140252865A1/en?inventor=corum

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WA4WAX
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« Reply #1 on: October 31, 2017, 04:28:20 PM »

This should provide strong incentive to you 160 meter people.

One of these doublets would be very small compared to the usual antennas.  Best of all, you do not get a square law fall off.......50 or 100 watts would go a long way.

Use an air core made from #12 or #10.  About 30 uH would be a good start. Space about 3 wire diameters.  Do not close wind.  Go out along the axis of the coil from either end with some 1/2 copper pipe.  I would try about 4 feet in either direction initially.  Then, do a 90 degree turn with an elbow connector, and go out about 4 feet horizontally.  Add cylindrical electrodes, maybe 4 inches in diameter, and telescoping so surface area may be adjusted.  I would start with the bottom electrode about 5 feet above the ground.

Find the resonant frequency by dipping the big coil.  Once found, put a sensitive FSM off in the distance and look for a deflection.  The GDO should provide enough juice initially.  Adjust the height of the bottom electrode from ground, and the space between the top and bottom electrodes.  This may take some fiddling. 

If you nail it, go in with a link coupling loop and match to 50 ohms.  Then turn it loose......
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WA4WAX
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« Reply #2 on: November 01, 2017, 01:05:36 PM »

Yes, they are real.  We want to generate them on 160 meters, 473 KHz, 160-190 KHz, etc.

The wearable fabric is nifty stuff!

Folks, we live in a waveguide.  Always remember this interesting fact.

http://www.southgatearc.org/news/september2013/gekko_surface_wave_wireless_technology.htm#.Wfn-A01e4dU
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WBear2GCR
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Brrrr- it's cold in the shack! Fire up the BIG RIG


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« Reply #3 on: November 04, 2017, 07:45:42 PM »

WHOA!

This huge!

http://www.popularmechanics.com/technology/infrastructure/a8778/skimming-the-surface-the-return-of-teslas-surface-waves-15322250/



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_-_- bear WB2GCR                   http://www.bearlabs.com
WA4WAX
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« Reply #4 on: November 04, 2017, 08:36:59 PM »

To say the very least!

This technology might drive a sort of renaissance on 160 and the VLF bands.  If the FCC allowed licensed amateurs to run about 25 watts on the VLF bands with Zenneck probes, that would be great!

For county and regional work, it would be like having a private phone line.
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WA4WAX
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« Reply #5 on: November 04, 2017, 08:46:46 PM »

Here is an interesting pdf for interested parties.

http://emlab.utep.edu/ee5390em21/Lecture%2021%20--%20Surface%20waves.pdf

In optics, they call them evanescent waves.

http://emlab.utep.edu/ee5390em21/Lecture%2021%20--%20Surface%20waves.pdf
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W7TFO
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IN A TRIODE NO ONE CAN HEAR YOU SCREEN


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« Reply #6 on: November 04, 2017, 10:25:29 PM »

In a similar vein, I know of a privately-held early copy of J.C. Maxwell's description & use of scalar waves.

73DG
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Just pacing the Farady cage...
WBear2GCR
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Brrrr- it's cold in the shack! Fire up the BIG RIG


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« Reply #7 on: November 05, 2017, 04:32:09 PM »



https://www.raytheon.com/capabilities/products/hfswr/
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_-_- bear WB2GCR                   http://www.bearlabs.com
WA4WAX
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« Reply #8 on: November 06, 2017, 01:04:55 PM »

Here is something to pour over.

Look at how small that 6 meter (nominal) doublet probe is.

http://www.texzontechnologies.com/wp-content/uploads/2016/09/TEXZON_Baylor_Corum16.pdf
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