For One and All,
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[ Another "On Topic" Post 'originated' by RHF ]
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Radio Propagation Information from Your "Remote S-Meter" WebSite
REMOTE S-METER = http://www.smeter.net/
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Radio Propagation
http://www.smeter.net/propagation/propagation.php
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* View the exact current gray-line position on Earth.
http://www.smeter.net/propagation/vi...-gray-line.php
Current Gray-Line on Earth Current Gray-Line on a World
Topographical Map Special ionospheric propagation conditions
often exist between two or more stations simultaneously . . .
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* Current Sun View of Earth
Current Solar High-Noon & Gray-Line
http://www.smeter.net/propagation/vi...h-from-sun.php
The current position of the Sun over the Earth is a primary
factor determining current radio propagation conditions . . .
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* Current Moon View of Earth Current View of Earth
from the Moon
http://www.smeter.net/propagation/vi...-from-moon.php
The current position of the Moon over the Earth
is important to Earth-Moon-Earth (EME) moon-bounce
communications, because . . .
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* Northern Hemisphere Aurora Northern Hemisphere
Auroral Activity
http://www.smeter.net/propagation/vi...vity-north.php
Displays a statistical plot that provides an estimate of the
location, intensity and extent of current northern hemisphere
Aurora . . .
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* Southern Hemisphere Aurora Southern Hemisphere
Auroral Activity
http://www.smeter.net/propagation/vi...vity-south.php
Displays a statistical plot that provides an estimate of the
location, intensity and extent of current southern hemisphere
Aurora . . .
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FREE "DOWNLOADS" - Radio Propagation Analysis Programs
Run these free radio propagation programs from the web or
download and run them from your hard drive.
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* Diffraction 1 Radio Propagation by Diffraction Over an
Obstruction When there are two radio antennas located on
or near the Earth's surface propagation can ordinarily occur
between them by groundwave. If an obstruction, a hill,
a mountain, a building intervenes, propagation can still
occur via slant paths over the top edge of the obstruction.
This depends on diffraction over the edge. So, in addition to
the basic or spreading loss along the sum of the slant paths,
D1+D2, there is an additional loss due to diffraction . . .
DF#1 = http://www.smeter.net/propagation/diffrac1.php
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* Diffraction 2 Radio Propagation by Diffraction Over Two
Successive Obstructions This program calculates the
overall transmitter-to-receiver loss when the radio path
includes diffraction over two successive obstructions.
Results include field strength at the receiving site.
Antenna efficiency can be allowed for . . .
DF#1 = http://www.smeter.net/propagation/diffrac2.php
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* Groundwave Groundwave Propagation vs. Path-length
& Frequency for Various Terrains Both transmitting and
receiving antennas are verticals, height = 1/4-wavelength
or less, above a system of buried radial wires.
A 1/2-wave vertical has 1 dB more gain than a short vertical.
A 5/8-wave vertical has 1.6 dB more gain . . .
GWP = http://www.smeter.net/propagation/grndwav3.php
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Line-of-Sight Propagation Over Line-of-Sight Radio Paths
This program covers just the essentials. Refraction in the
Earth's atmosphere, ground reflections and antenna
radiating efficiency are not taken into account . . .
LOS = http://www.smeter.net/propagation/lineosite.php
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* Two-Hops Sky-Wave Trigonometry For given one-hop
ground path distance and height of reflecting layer this
program calculates radio path distances and the
radio-path elevation angle . . .
SWT = http://www.smeter.net/propagation/twohops.php
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iane ~ RHF
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All are WELCOME and "Invited to Join" the
Shortwave Listener (SWL) eGroup on YAHOO!
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
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Some Say: On A Clear Day You Can See Forever.
http://groups.yahoo.com/group/Shortw...na/message/502
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I BELIEVE: On A Clear Night . . .
You Can Hear Forever and Beyond, The BEYOND !
With a Shortwave Listener SWL Antenna of your own making.
"If You Build It {SWL Antenna} You Will Hear Them !"