Radio Recordings

Steve Yates - AA5TB

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Last Update: January 27, 2010

On this page I have links to some of my other pages where I have various recordings that I have made over the years. I've tried to organize them by category the best that I can. The recordings are of amateur signals, intruders within the amateur bands, broadcast, or natural phenomenon.


Clandestine Broadcast:

These are recordings of illegal broadcast transmissions from either clandestine government stations or pirate radio stations.


Cluster Beacons:

Single Letter Beacons are mysterious CW beacons that "cluster" around a certain fixed frequency. Sometimes they are called Cluster Beacons. Their true purpose is not well advertised although there is much speculation. However, they do come in handy for use as propagations beacons for paths into various parts of Russia. Here I have recordings of various single letter beacon transmissions.


DX Stations:


Radio Echoes - Short and Long Path:

On HF there exist at least two possible "great circle" paths around the world between any two points on its surface. One path takes the shortest distance and the other path is the long way around, or "long path". I say at least two because at certain times there can exist skewed or backscatter paths that would create an endless number of possible paths although the great circle short and long paths are the most common.

At times of exceptional propagation both the short and long paths can exists between two points and often times the long path will be the stronger of the two. This is a common phenomenon on the upper half of the HF spectrum (14 to 30 MHz) during periods of increased solar activity.

Since both short and long paths exist at the same time there is a very pronounced "echo" effect. It is not a true echo since it is not caused by a distant reflection but the result is the same. In fact, sometimes the first signal from the short path is actually weaker then the long path delayed signal. Sometimes the interference from the two paths can make even slow speed CW stations unreadable!

Just for reference, it takes roughly 137 milliseconds for a HF radio signal to travel around the world once. This is of course a significant delay even though it is going the speed of light. These long path signals kind of put things in perspective!


Amateur Band Intruders:


Misc. Recordings:


Mysterious Signals:

Transmissions related to sneaky foreign government and/or spy activities are often referred to as "spook" transmissions. On this page I have recordings or links to my pages that contain recordings that I have made of various odd transmissions within the amateur bands that can be probably be qualified as spook transmissions.


Natural EM Phenomenon:


Space Based Signals:


Spooks ("Number Stations", etc.):

Transmissions related to sneaky foreign government and/or spy activities are often referred to as "spook" transmissions. Here I have recordings or links to my pages that contain recordings that I have made of various odd transmissions within the amateur bands that can probably be qualified as spook transmissions.


VLF Signals:

Here are some photos of the setup used to record the last couple of sound files:

VLF Setup 1

VLF Setup 1

VLF Setup 1

VLF Setup 1