01 GOOSE
 

Received permanently day and night from 2002 until 2009 in an area of 40 kilometers of diameter. The source seemed to be located in the northern Eifel region in Germany. The signal consists of bursts of 16 Hz sine signals and begins with a kind of header. Then something like an address code is following where one burst of a fixed number of usually eleven or twelve bursts is missing.  After that, an irregular pattern of four or five bursts is following. The signal repeats irregularly within 24 hours, but this irregular pattern was usually repeated each day. The signal was so strong that it could even be heard in real time as a loud hum via an ordinary guitar amplifier.

Listen the file in MP3 format, accelerated 160 times 1.mp3

02 COW
 

Received permanently day and night from 2002 until 2006. There were two sources sounding similar but differing in their pitch a little. The signals came regular and independent from each other but the pauses between two signals differed from day to day. The spectrum shows a very low and dense line structure reminding at (and sounding like) a ramp signal.

Listen the file in MP3 format, accelerated 160 times 2.mp3

03 PIPER
 

Received each day for two to four hours at irregular start times. The signal is characterized by sequences of sine waves mixed with a noise which change their frequency stepwise. The pattern is separated in groups of 12 to 13 steps. In the pauses it sounds like as if another station would “reply”. Similar signals could be received from time to time until today in different parts of Germany.

Listen the file in MP3 format, accelerated 160 times 3.mp3

04 HEARTBEAT
 

Very strong signal appearing from the beginning of 2004. This signal now can be received everywhere in Germany and probably also in the neighbour countries, coming from a lot of different sources and appearing only at (irregular) daytimes. The FFT vs. Time of the signal structure looks nearly like a symmetrical square wave. The time signal shows a sequence of positive and negative peaks which indicates the influence of a coil or a capacitor. The length of the signal period is about 0.62 seconds.

Listen the file in MP3 format, accelerated 160 times 4.mp3

05 Needle printer
 

This signal only appeared in January 2004. It was received never before and never after and sounds exactly like an old fashioned needle printer, showing also a very complex time and FFT signal that indicates some kind of data transfer.

Listen the file in MP3 format, accelerated 160 times 5.mp3

06 RTTY
 

This signal also was present only for a short time (recording time not documented but between 2003 and 2006). It sounds like an old computer modem or a RTTY radio teletype signal on shortwave. Similar signals could be recorded at some times in different places in Germany.

Listen the file in MP3 format, accelerated 160 times 6.mp3

07 VOICE
 

Recorded from 2006 until 2010 in the region of Alsdorf, Germany. The given example is a collection of the most interesting signals sounding like a robot voice. Each night most of the time only a few “words” could be received after pauses of some hours.

Listen the file in MP3 format, accelerated 160 times 7.mp3

08 RTTY 2
 

This signal really sounds like an RTTY shortwave signal: A sine carrier jumps between to constant frequencies. The signal could be recorded day and night over the weekend in 2008 in a hotel room as well as at the hotels parking lot in a small village near the German town Saarbrücken.

Listen the file in MP3 format, accelerated 160 times 8.mp3

09 Night Owl
 

This sound was also recorded near Saarbrücken in the year 2005 (over night) in a private house at the border of a forest. Similar signals can be recorded since 2009 at the authors home Alsdorf via earth probes.

Listen the file in MP3 format, accelerated 160 times 9.mp3

10 Cricket

These signals reminding at a cricket sometimes could be recorded at different times and places all around Germany.

Listen the file in MP3 format, accelerated 160 times 10.mp3

11 Fog horn

The foghorn signal is partly comparable to the cow signal could be received in Alsdorf at the authors home since 2006. The signal can be received by coil and by probes. At some months, it is very strong and at other months it is completely gone (like at the moment since two months)..

Listen the file in MP3 format, accelerated 160 times 11.mp3

12 Wild goose

Sounds a little like those big birds going to Africa each fall when flying over our heads (or coming back in spring). This signal could be recorded at different places and times.

Listen the file in MP3 format, accelerated 160 times 12.mp3

13 FM sound

This strange recorded sound can also be produced by modulating a sine wave oscillator by another one in its frequency while changing the frequencies permanently. These kind of signals (they are never completely the same) appear extremely rare and at different places.

Listen the file in MP3 format, accelerated 160 times 13.mp3

14 Truck horn

Sounds a little like the horn of a bypassing truck on a highway. This signal until now only could be registered in Alsdorf since two years and appears a few times within 24 hours at day and sometimes at night too.

Listen the file in MP3 format, accelerated 160 times 14.mp3

15 Lower piper

Very interesting signal which sounds like a flute and which only can be recorded with earth probes and only at the author’s garden. The signal appeared the first time in January 2011 and was so strong that the receiver was nearly overdriven. The frequency is very low and goes from below one up to 5 Hz. The typical signal pattern is a “base line” which is permanently present. From this base line, the tones are mounting in constant and harmonic steps (notes) up or down and returning again to the base line as shown in the example. Sometimes the pattern is regular and sometimes irregular. Sometimes, the frequency of the base line is changing. The signal vanished a few months later and came back in 2013, but not as strong as before. In addition, the frequency is not stable but kind of “shaky”, as if someone would use a generator driven by muscle power. Since a few weeks, the signal got lower and lower in its level and now seems to vanish completely behind the natural noise.

Listen the file in MP3 format, accelerated 160 times 15.mp3

16 Pan flute

Recording made in 2004 in a village near Saarbrücken in a private house in a living area at the border of a forest (15 kilometers from the place where the night owl was recorded). The typical sequence of sine wave tones mounting and falling in constant steps reminds me of the sound of a pan flute.

Listen the file in MP3 format, accelerated 160 times 16.mp3

17 Pan flute 2

It’s hard to find any natural sound comparable to this, but it reminds me a little of the pan flute. It’s only a little more complex. In the FFT vs. Time we also can see a complex pattern of parallel sine waves changing stepwise their frequency. This signal is very rare and only can be detected by probes at the author’s home since 2009.

Listen the file in MP3 format, accelerated 160 times 17.mp3

18 Siren

This signal appears at the author’s home from afternoon to approximately 9 or 10 pm since one year and seems to get longer and longer by time. The frequency of a sine wave signal seems to mount from zero to a few hertz and then falling and mounting again periodically. The small hooks sometimes appearing make the whole spectrogram look like a ramp-factory roof with chimneys.

Listen the file in MP3 format, accelerated 160 times 18.mp3