Topband: Inquiring minds want to know....

[Carl Luetzelschwab]

> What the heck happened that I could hear a
> long wave signal over 2000 miles away at mid day?

For a given electron density profile, the amount of refraction incurred by
an electromagnetic wave is inversely proportional to the square of the
frequency.

The result of that is the lower the frequency, the less high the wave gets
into the ionosphere. LF hardly reaches the absorbing region (the D region
during the day), and thus LF suffers minimal ionospheric absorption. The
wave refracts between the lower ionosphere and Earth - also known as the
Earth-ionosphere wave guide.

NO3M has heard VK4YB on 2200m (137 KHz) many times. I'm sure there are
other examples like that out there.

Carl K9LA