HF Radio Conditions

red bars indicate a major solar flare







VOACAP Custom Predictions
Click on the image below to go to voacap.com:

For the kind of map shown above, go here




foF2: F2-Layer Critical Frequency Map
The following image is a recent high-resolution global map of F2-layer critical frequencies. This shows the maximum radio frequency that can be reflected by the F2-region of the ionosphere at vertical incidence (that is, when the signal is transmitted straight up into the ionosphere). This definitely shows why, some days, short-skip on e.g. 40 and 75 meters is just not working.
From www.sws.bom.gov.au




More on the F and E layers, and Ionograms:
This site shows quite a bit of information on ionospheric conditions. Quite a learning curve trying to interpret it. The image here is not current. You have to navigate to the correct date and time from here: Click on Locations, get the list of locations, and e.g. Pt Arguello (Santa Barbara Calif) is one U.S. location. Other U.S. locations include Austin, Boulder, College AK, Guam, Idaho, and Wallops Island. Kudos to K6HTN Kate for pointing out this site.
from ulcar.uml.edu/DIDBase/


Interpretation of ionograms:







Worldwide WSPR Activity, can filter by callsign and band
WSPR Basics
WSPR Frequencies
Author K1JT WSPR page





My QSO Log (partial) - all modes

and only shows 'last 15 QSOs'







Solar info courtesy N0NBH (not including the NOAA bar chart, and the foF2 maps)





Magnetic Loop and Small Loop Antennas




NAVTEX Stations at 518 kHz (517 USB dial, 1000Hz offset)

Station Identifier WX Broadcast Schedule (UTC)
Effective August 14, 2012 at 0000 UTC
Adak X (Broadcast terminated Dec ‘96)
Kodiak1 J
0130, 0530, 09302, 1330, 1730, 21302
0350, 0750, 11502, 1550, 1950, 23502
Astoria W 03402, 0740, 1140, 15402, 1940, 2340
San Francisco C 0020, 04202, 0820, 1220, 16202, 2020
Cambria Q 02402, 0640, 1040, 14402, 1840, 2240
Marianas V 0330, 0730, 1130, 1530, 1930, 2330
Honolulu O 0220, 0620, 10202, 1420, 1820, 22202
Boston F 0050, 0450, 08502, 1250, 1650, 20502
Portsmouth N 02102, 0610, 1010, 14102, 1810, 2210
CharlestonE0040, 0440, 08402, 1240, 1640, 20402
Miami A 0000, 0400, 08002, 1200, 1600, 20002
San Juan R 02502, 0650, 1050, 14502, 1850, 2250
New Orleans G 0100, 0500, 09002, 1300, 1700, 21002
1. Kodiak also broadcasts weather forecasts during time slots initially allocated to Adak.

2. Routine weather forecasts are broadcast four times per day with these being the normal times when repeats of Notices to Mariners are broadcast in lieu of weather. Weather warnings may be broadcast at any time.

The U.S. Coast Guard may on occasion have to defer or shorten the broadcast of a scheduled weather forecast via NAVTEX to ensure delivery of more urgent navigational and safety warnings.

NAVTEX receivers must be programmed with proper NAVTEX station and subject identifiers in order to receive weather broadcasts.

It is intended that all NAVTEX weather be broadcast with subject indicator "B", for Meteorological Warnings, which cannot be rejected by the NAVTEX receiver, or "E" for routine forecasts. However, this cannot be fully implemented at the present time within the U.S. Therefore, all mariners in U.S. waters should program their NAVTEX receivers to include subject indicator "E" in order to receive both warnings and routine weather forecasts via NAVTEX.

Effective April 22, 2008 U.S. NAVTEX broadcasts of weather forecasts containing a warning or a Dense Fog Advisory will be broadcast with a Subject Indicator of "B" vs. "E", such that receipt cannot be suppressed on the user's equipment. Mariners are encouraged to include subject indicator "E" in programming their NAVTEX in order to receive routine weather forecasts as well as weather warnings via NAVTEX.

Above table is from: NOAA


More Navtex links:





Play chess here (Java required)





The graphic of the spark-gap radio station is taken from http://home.windstream.net/adye/webpages/Spark%20Gap.htm