https://www.fcc.gov/media/radio/m3-ground-conductivity-map#block-menu-block-
4
The link on the page to the download version has reasonable detail...
Having performed many field strength surveys for broadcasting ( using a
Nems-Clarke and later an Potomac FIM ), I can tell you that the real world
varies a significant amount. The urbanized areas are much poorer, and of
course the transitions between conductivity areas will vary.
Your state Agriculture Department might have more detailed soil maps that
could be used as a starting point for estimated local soil conductivity.
73
Lloyd - N9LB
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Jeff
Kinzli N6GQ
Sent: Sunday, April 01, 2018 9:46 AM
To: top Band <topband@contesting.com>
Subject: Topband: Soil conductivity maps
So I'm looking to purchase a new QTH. I'm not particular about location, but
would like to optimize for soil conductivity and any other parameters that
would increase near and far field propagation and minimize ground losses.
I've seen the US Gov M3 maps, but they are very coarse. They also only
define conductivity, and I'm wondering what other quantities would be useful
to look at.
I know that a salt water takeoff or marsh is awesome, but that's not gonna
happen in this iteration - looking very much central USA (W5, TX), inland.
So, any more fine-grained maps available? Or other quantities that would be
worth looking at? Books that discuss this sort of thing?
Mostly for either pinpointing optimal areas, or making sure that a good
looking property is at least half-way decent...
Thanks for any guidance,
de N6GQ
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