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Total 35 documents matching your query.

1. Topband: Ground conductivity (score: 1)
Author: "K1FZ-Bruce" <k1fz@myfairpoint.net>
Date: Tue, 29 Mar 2016 22:16:48 -0400
    Done my yearly spring maintenance of my SE single wire Beverage antenna.   With poor soil, It typically is best  with a 350 ohm matching  transformer and a 330 to 350 ohm termination resistor. Bu
/archives//html/Topband/2016-03/msg00279.html (7,939 bytes)

2. Re: Topband: Ground conductivity (score: 1)
Author: "R. David Eagle via Topband" <topband@contesting.com>
Date: Wed, 30 Mar 2016 02:40:39 +0000 (UTC)
Bruce, I believe that is extremely possible.  I have witnessed the same exact thing here in northern lower MI where we live in giant sandbox.  I have especially noticed changes in feed point impedanc
/archives//html/Topband/2016-03/msg00280.html (8,866 bytes)

3. Topband: Ground Conductivity (score: 1)
Author: "Chortek, Robert L." <Robert.Chortek@berliner.com>
Date: Mon, 23 Mar 2020 22:01:54 +0000
A quick question for the collective wisdom on this esteemed reflector: How would one categorize the quality of ground consisting of grass. For example, if you live next to a large (many acres) open s
/archives//html/Topband/2020-03/msg00288.html (7,286 bytes)

4. Re: Topband: Ground Conductivity (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Mon, 23 Mar 2020 18:45:23 -0400
On 160M the " skin depth" of ground goes beyond the grass ...so it depends on more than just your yard but also the type of soil underneath, how often it is watered , fertilized etc etc. What are you
/archives//html/Topband/2020-03/msg00290.html (8,358 bytes)

5. Re: Topband: Ground Conductivity (score: 1)
Author: Mike Waters <mikewate@gmail.com>
Date: Mon, 23 Mar 2020 17:53:00 -0500
You may find this interesting. https://ham.stackexchange.com/a/14799/8717 How useful it is, is another matter! ;-) 73, Mike W0BTU _________________ Searchable Archives: http://www.contesting.com/_top
/archives//html/Topband/2020-03/msg00292.html (7,099 bytes)

6. Re: Topband: Ground Conductivity (score: 1)
Author: "Chortek, Robert L." <Robert.Chortek@berliner.com>
Date: Mon, 23 Mar 2020 22:57:34 +0000
Hi Dave, Im (just) starting to play with EZNEC and want to know what type of ground Im dealing with when Im running various models. I live on the second fairway of a.golf course and the way its confi
/archives//html/Topband/2020-03/msg00293.html (10,081 bytes)

7. Re: Topband: Ground Conductivity (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Mon, 23 Mar 2020 13:21:07 -1000
AA6VB, QTH San Jose, California looks like *8 mS/m* FCC ground conductivity map https://www.fcc.gov/media/radio/m3-ground-conductivity-map A more detailed map https://www.americanradiohistory.com/FCC
/archives//html/Topband/2020-03/msg00294.html (8,769 bytes)

8. Re: Topband: Ground Conductivity (score: 1)
Author: Dave Cuthbert <telegrapher9@gmail.com>
Date: Mon, 23 Mar 2020 13:35:33 -1000
Robert, an EZNEC model of your vertical as described in your QRZ bio shows your measured 29.7 ohm input resistance when ground conductivity is set to *0.008 S/m*. EZNEC calls this (0.0075S/12) ground
/archives//html/Topband/2020-03/msg00295.html (9,087 bytes)

9. Re: Topband: Ground Conductivity (score: 1)
Author: Grant Saviers <grants2@pacbell.net>
Date: Mon, 23 Mar 2020 17:48:29 -0700
FYI some data which I found interesting My dry earth at end of summer to very wet winter (WWA) causes my lightning ground system DC (actually about 300Hz AC) resistance to vary about 40% lower, ie 7+
/archives//html/Topband/2020-03/msg00296.html (11,768 bytes)

10. Re: Topband: Ground Conductivity (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Mon, 23 Mar 2020 18:23:52 -0700
How would one categorize the quality of ground consisting of grass. For example, if you live next to a large (many acres) open space made entirely of well watered grass, would that qualify as average
/archives//html/Topband/2020-03/msg00297.html (8,777 bytes)

11. Topband: Ground Conductivity (score: 1)
Author: "Chortek, Robert L." <Robert.Chortek@berliner.com>
Date: Tue, 24 Mar 2020 02:36:15 +0000
Thank you all for your very helpful and informative responses. Thanks to everyone for taking the time to respond. Much appreciated! 73, Bob/AA6VB Robert L. Chortek _________________ Searchable Archiv
/archives//html/Topband/2020-03/msg00301.html (7,321 bytes)

12. Re: Topband: Ground Conductivity (score: 1)
Author: Wes <wes_n7ws@triconet.org>
Date: Mon, 23 Mar 2020 20:37:09 -0700
I have saved all (I think) of Rudy's papers on antennas and ground.  What a resource. He seems to have boundless energy, patience and perseverance. Wes  N7WS On 3/23/2020 6:23 PM, Richard (Rick) Karl
/archives//html/Topband/2020-03/msg00302.html (8,273 bytes)

13. Re: Topband: Ground Conductivity (score: 1)
Author: donovanf@starpower.net
Date: Tue, 24 Mar 2020 00:05:58 -0400 (EDT)
Excellent skin depth reference here: www.antennasbyn6lf.com/files/ground_skin_depth_and_wavelength.pdf Ground characteristics are much more significant for vertical polarization than for horizontal p
/archives//html/Topband/2020-03/msg00303.html (9,753 bytes)

14. Re: Topband: Ground Conductivity (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 23 Mar 2020 22:04:57 -0700
www.antennasbyn6lf.com/files/ground_skin_depth_and_wavelength.pdf Rudy is a great reference for anything he's chosen to study. An excellent engineer and scientist. Ground characteristics are much mor
/archives//html/Topband/2020-03/msg00307.html (9,405 bytes)

15. Re: Topband: Ground Conductivity (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 23 Mar 2020 22:14:47 -0700
A casual observer sightseeing would have no idea of this change in soil. Here's a link to the ground conductivity contour map from FCC Regs for the AM broadcast band. http://k9yc.com/FCC-GroundMap.zi
/archives//html/Topband/2020-03/msg00308.html (9,229 bytes)

16. Re: Topband: Ground Conductivity (score: 1)
Author: Dan Maguire via Topband <topband@contesting.com>
Date: Tue, 24 Mar 2020 05:18:15 +0000 (UTC)
Turns out that very subject was being kicked around on a recent qrz.com thread: https://forums.qrz.com/index.php?threads/indirect-measurement-of-ground-constants-with-a-dipole.696955/ Dan, AC6LA ____
/archives//html/Topband/2020-03/msg00309.html (8,164 bytes)

17. Re: Topband: Ground Conductivity (score: 1)
Author: "Richard (Rick) Karlquist" <richard@karlquist.com>
Date: Mon, 23 Mar 2020 23:02:55 -0700
A heuristic way to judge ground conductivity: If 160 meter Beverages work well, especially over 1 wavelength long, you don't have high ground conductivity. If Beverages are not particularly sensitive
/archives//html/Topband/2020-03/msg00310.html (8,160 bytes)

18. Re: Topband: Ground Conductivity (score: 1)
Author: Artek Manuals <Manuals@ArtekManuals.com>
Date: Tue, 24 Mar 2020 07:21:05 -0400
Ahhh .......but what about vertical antennas with elevated radials ????? www.antennasbyn6lf.com/files/ground_skin_depth_and_wavelength.pdf Rudy is a great reference for anything he's chosen to study.
/archives//html/Topband/2020-03/msg00315.html (10,018 bytes)

19. Re: Topband: Ground Conductivity (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Tue, 24 Mar 2020 09:21:31 -0400
To some extent the term "ground conductivity" is misleading. It gives us false hope. If we thought of it as ground "resistance" we would gain a better appreciation of what it does to RF currents. In
/archives//html/Topband/2020-03/msg00316.html (9,296 bytes)

20. Re: Topband: Ground Conductivity (score: 1)
Author: Roy Morgan <k1lky68@gmail.com>
Date: Tue, 24 Mar 2020 11:42:05 -0400
George, Your comment about over simplifying reminds me of a very early explanation of radio communication - or was it telegraph? I can remember only a little: "It's like wiggling the tail of a cat. I
/archives//html/Topband/2020-03/msg00318.html (8,768 bytes)

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