LA3ZA Radio and Electronics

On 7. November 2015, several radio amateurs in northern California heard echoes in the 80 meter band. I was made aware of it by Jack, W6FB i...

Medium Delayed Echoes or Magnetospherically Ducted Echoes (both MDE) are radio echoes delayed from 0.14-0.3 seconds. They represent a su...

Earthrise from Apollo 8 ( NASA ) My blog has just been updated by migrating posts from my old web site containing a collection of audi...

Magnetic field lines in the magnetosphere (Ill. NASA) Signals in the 1.8 - 4 MHz range may pass the ionosphere and be ducted in the mag...