LA3ZA Radio and Electronics

Propagation of wave energy to distance d, 2d, 3d  showing how the size of the surface that the energy spreads over increases in proportion t...

This is the first time I have observed Doppler shift in the 6 meter band. It is not so hard to see on the waterfall display of FT8. The ...

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,...

 Great circle path between Anchorage and Oslo Here's what a transpolar signal sounds like ( click here to listen ) and looks like (b...

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

Sometimes looking up remote stations on QRZ.com or other sites gives a glimpse of the person behind the callsign. I did this for the Chine...

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...

Final 'F' in UA3MIF. Notice echoes of final dot marked by arrows. Press image to enlarge. There were excellent conditions durin...

Tonight had nice aurora conditions on 6 meters due to a geomagnetic storm . The Elecraft K3/P3 combo did an excellent job in showing how ...

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...

The Japanese station JA3YBK was received in Oslo ( press here for audio ), 30. November 2003, 08:20 UTC on 21.004 MHz during the CQ Worl...

Northern Lights in Tromsø, Norway  Here is a recording of the Swedish station SM6CNN in contact with me on 29. October 2003, 22:42 UTC ...

Arctic areas Here is a recording of JW/DJ3KR on Spitzbergen from 24. August 2007, at about 21:45 UTC. This was only a few minutes after...

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...