The recent discussions on conductivity have talked about different soil types and saltwater. Is there any information available about conductivity for antennas mounted above "fresh" water (ie lakes)
I believe that fresh water has very poor conductivity. Salt water has very good conductivity. Les W2LK The recent discussions on conductivity have talked about different soil types and saltwater. Is
Salt water has very That's correct, but lakes have contaminants that increase conductivity significantly over pure fresh water. For example the Great Lakes' conductivity is in the range of poor to f
Surface Type Conductivity (S/m) Fresh water .001 Salt water 5.0 Pastoral hills (dallas!) .0303 etc Fresh water is about the worst ground system there is, according to this table. In terms of conduct
If fresh water is bad then how come dx'ing is better when water table is high vs low water table? One place I lived I had a water table indicator in the well. Only noticed because indicator was on wa
The 15th edition, ARRL Antenna Handbook, cites ranges for conductivity: Poor soil 1-5 milliseimens per meter Average soil and fresh water 10-15 milliseimens per meter Very good soil 100 milliseimens
No. In college, a group of us put a 600+ foot beverage (mostly) over the corner of a large lake for a 160 contest. It was a huge PITA, and it didn't hear as good as one next to it on the dirt. Roost
water table is table on wall For the very same reason cleaning and waxing causes my car to run better, my wipers play along with the beat of a song, and turn signals flash in order. DX HF communicat
I was under the impression that soil conductivity mattered a great deal when using vertical polarization. With respect to horizontal polarization, however, I would agree that it doesn't matter all th
The 15th edition, ARRL Antenna Handbook, cites ranges for conductivity: Poor soil 1-5 milliseimens per meter Average soil and fresh water 10-15 milliseimens per meter Very good soil 100 milliseimens
Part of the reason that antennas perform well over water is not so much the conductivity, but the spectacularly high dielectric constant (80) which means that any body of water is a really good refle
A Canadian gov't website claims that the conductivity of the Great Lakes water feeding into the St. Lawrence is about 300 uS/cm (=30 mS/m). I grant that this is at the downstream end of all the citie
I think this number is spuriously low. As far as water table moving up and down, you're really seeing the soil conductivity and dielectric constant changing as a function of its water content. Jim, W
a great horizontal matter all that If you are working groundwave, it matters a great deal. That because the very long path accumulates attenuation as the signal follows the lossy media over a very l
The high water table helps ionize salts in the soil. Keith --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Jones Sent: Monday, F
the Great Lakes (=30 mS/m). I grant all the lakes. water (from Lake I only know what we measured and extrapolated to FCC conductivity Jim using stations at the high end of the AM BCB. We did that by
That's exactly what I would do, based on what I learned as a young EE student working for Pete Johnson in his BC consulting business around 1962. Pete and Carl Smith wrote the FCC's technical regs on
OK, OK. This is an interesting thread but PLEASE remove my email address from each reply. I am getting everything a couple of times. Thanks, Les the Great Lakes (=30 mS/m). I grant all the lakes. wat
Is there any way I can take meaningful soil conductivity readings with simple equipment? 73, Jerry K3BZ _______________________________________________ See: http://www.mscomputer.com for "Self Suppor
Author: "Roger K8RI on Tower" <k8ri-tower@charter.net>
Date: Mon, 28 Feb 2005 17:36:14 -0500
Fresh water is a long way from pure. It generally contains a lot of salts where as distilled or deionized water is highly corrosive as it *wants* metals to create those salts. <snip> Years ago I did