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6 votes
Accepted

What frequency ranges are most common for Amateur radio astronomy and why are most parabolic antennas tuned to such high frequencies?

In general I was expecting that the lower frequencies would be more useful, since hams usually can receive and transmit longer distance signals with lower frequencies. This is because a certain range ...
natevw - AF7TB's user avatar
3 votes

What is the cause of this unusually long period of terrible HF band conditions?

In an effort to find some hard data, I wrote to Dr Carl Luetzelschwab, K9LA. Carl responds: "The main reason is because we've basically been under solar minimum conditions for two years - and it ...
Brian K1LI's user avatar
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3 votes

What frequency ranges are most common for Amateur radio astronomy and why are most parabolic antennas tuned to such high frequencies?

Wavelengths above 10 meters tend to be blocked by the ionosphere. Wavelengths below 10 centimeters tend to be absorbed by the atmosphere. There are other windows that allow narrow frequency bands to ...
Jim's user avatar
  • 1,778
2 votes

How does one know when band conditions are optimal and what factors to consider?

The Band Activity chart at DX Heat is a good way to evaluate propagation from the standpoint of "who is working whom, right now." Combining the color coded activity depiction with your general ...
Brian K1LI's user avatar
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1 vote

What is the cause of this unusually long period of terrible HF band conditions?

It's pretty clear that we've reached the ~10.7-year solar cycle minimum in the midst of a low part of the ~87-year Gleissberg Cycle. See this explanation from Wikipedia. Occam's Razor points toward ...
Dwight Ernest's user avatar
1 vote

How does one know when band conditions are optimal and what factors to consider?

The DXLab Suite includes PropView, a convenient front-end to VOACAP, which makes current and near-term propagation predictions. PropView works in conjunction with the other components of the DXLab ...
Brian K1LI's user avatar
  • 7,878

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