LA3ZA Radio and Electronics

Elecraft K3: Upper trace is start of sidetone and lower trace is start of RF ~15 ms later. An amateur radio transceiver is not a precision m...

My friend Alf, LA2NTA, has sent me these screenshots from when he has been operating FT8. The first image is when operating 10 meters and to...

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...

“The starship hypothesis is a very interesting one, and the one which seems to be the most popular one on the internet,” said Sverre Holm,...

Thierry, F4EOB from Paris is still hearing strange echoes on the VOA Chinese service broadcasts. There isn't really any good explanati...

Laurent, F6GOX, who is one of the primary forces behind the ARP, Radio-Club de Paris, has written a nice little French-language presentatio...

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

4.5 metre high UK acoustic mirror used as early warning system during WW1. Not so relevant for Long Delayed Echos, but something which d...

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...

Recently, a facility with big enough antenna (300 by 365 m) and high enough power (3.6 MW) was used to set a new record for how low in fr...