|Subject:||[Propagation] Critical vs. Maximum Usable Frequency map|
|From:||"NW7US, Tomas" <email@example.com>|
|Date:||Sun, 26 Sep 2004 12:23:02 -0700|
On Sun, 26 Sep 2004 06:09:16 -0000, David Ackrill
If you want the local F2 Critical frequency (the one where signals go almost straight up and down, try looking at this map.
Excellent map for this.
Also of interest are the "live" (using real measurements) HAP maps from IPS:
North America HAP maps: http://www.ips.gov.au/Main.php?CatID=6&SecID=4&SecName=North%20America&SubSecID=1&SubSecName=HAP%20Charts
North America Ionospheric map: http://www.ips.gov.au/Main.php?CatID=6&SecID=4&SecName=North%20America&SubSecID=3&SubSecName=Ionospheric%20Map
The best jump off point for IPS HF-related data is: http://www.ips.gov.au/Main.php?CatID=6
These HAP maps are "Hourly Area Predictions" of communication frequencies based on current observed conditions in the North America ionosphere. Because of the variability of the ionosphere this type of prediction can only be made for the current hour.
For paths that are more typical of "DX" (3000 km paths), there is also this map:
73 de Tomas, NW7US (AARØJA/AAAØWA)
: Propagation Editor for CQ, CQ VHF, and Popular Communications : : Quarterly Propagation Columnist for Monitoring Times Magazine : : Creator of live propagation center - http://prop.hfradio.org/ : : Member, US Army Miltary Affiliate Radio Service (MARS) AARØJA : : 122.93W 47.67N / Brinnon, Washington USA - CN87 - CW/SSB/DIGI : : Website, software, database design - http://newwebmakers.com/ : : Washington State Army MARS, State Army MARS Director - AAAØWA : : 1Øx56526, FISTS 7Ø55, FISTS NW 57, AR Lighthouse Society 144 : _______________________________________________ Propagation mailing list Propagation@contesting.com http://lists.contesting.com/mailman/listinfo/propagation
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