HF Propagation Can we work Winter FD? Ionospheric Layers Making - PowerPoint PPT Presentation

Nov 27, 2023 •228 likes •596 views

HF Propagation Can we work Winter FD? Ionospheric Layers Making Ionosphere Sun creates ions Form layers above the earth Fairly predictable Day Night Seasons Sunspots Making Ions Making Ionosphere Layers Ionospheric

HF Propagation Can we work Winter FD?
Ionospheric Layers
Making Ionosphere • Sun creates ions • Form layers above the earth • Fairly predictable – Day – Night – Seasons – Sunspots
Making Ions
Making Ionosphere Layers
Ionospheric Layers
Ionospheric Refraction
What’s your Fc? • The highest frequency that bounces is critical – Straight up and back down – Fc is the nomenclature • Realtime Fc map • http://www.spacew.com/www/fof2.html – Updated every 5 minutes for free – Buy software for >$200 • Where does it come from?
Critical Frequency
Ionograph • Profile of Critical Frequency, and MORE • Digisonde – automatically plot a vertical profile • Project of Umass, Lowell • Stations all over the world
UMass Lowell • University of Massachusetts – Lowell • Space Science Lab – http://ulcar.uml.edu/digisonde.html • GIRO – Global Ionosphere Research Organization • IRTAM – IRI Real-Time Assimilative Mapping
UML-SSL
GIRO worldwide sites
GIRO site Reports • http://umlcar.uml.edu/WatchIt/latestIonogram .html • All sites – http://umlcar.uml.edu/WatchIt/latestIonograms.ht ml • Any one site – https://lgdc.uml.edu/common/DIDBFastStationList
http://giro.uml.edu/IRTAM/
LoS and Skip • Line of Site – Distance based on antenna tower height for VHF
Critical Frequency
Ionospheric Refraction
See MUF vs Distance chart
Montgomery vs Dallas Montgomery Dallas Pelham
Wire Antenna Pattern
Vertical Antenna
Two Wavelength Horizontal
V Beam Antenna
MUF vs LUF • I didn’t discuss LUF – Lowest Usable Frequency – Skywave problem – Daytime problem • MF problem – 160M – Ignore it for night time HF
URLs • https://ns6t.net/azimuth/azimuth.html • http://www.cvarc.org/resources/Tech_Articles /14-MUF-04-R.pdf • http://www.spacew.com/www/fof2.html • http://ulcar.uml.edu/digisonde.html – http://umlcar.uml.edu/WatchIt/latestIonograms.html – http://umlcar.uml.edu/WatchIt/latestIonogram.html – https://lgdc.uml.edu/common/DIDBFastStationList – http://giro.uml.edu/IRTAM

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