Long Dashes
.png) | |
|---|---|
| Frequencies | 6.496 MHz,8.999 MHz,11.999 MHz,12.494 MHz,16.174 MHz,21.899 MHz,27.928 MHz,29.996 MHz |
| Frequency Range | 6.496 MHz - 29.996 MHz |
| Mode | USB |
| Modulation | OOK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 1000 Hz |
| Location | Australia |
| Short Description | Repeating dashes on several frequencies, originating from Australia. Presumably used for ionospheric propagation testing/research. |
| I/Q Raw Recording | — |
| Audio Sample | No Audio File |
Long Dashes are 2.9 second long dashes with 1000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). wide 0.2 second multitone start. The Long Dashes are being transmitted on multiple frequencies at the same time. The dash is sent on one frequency at a time, sequentially, from 29996 kHzKiloHertz (kHz) 10^3 Hz to 6496 kHzKiloHertz (kHz) 10^3 Hz, with all intermediate frequencies in descending order. There is a 0.1 second pause in between the end of the dash transmission on one frequency and start of the dash transmission one the next frequency.
Unlike every other frequency, on 29996 kHzKiloHertz (kHz) 10^3 Hz, two dashes being transmitted in a row with 0.1 second pause in between.
The entire cycle of the transmission (from the highest frequency to the lowest) is 27 seconds.
The transmission itself lasts only several hours a day.
The origin of the signal is speculated to be a central Australia, based on KiwiSDR TDoA direction finding and correlation in strength with Australian signals on nearby frequencies. The theory is reinforced by the use of world wide remotes to confirm the fringe cases. Australian remotes show strong signals on the lower frequency pretty much any time the signal is active, and almost never on the upper frequencies, supporting Australia is generally inside the skip zone of the upper frequencies.
The signal is presumably used for ionospheric propagation testing or research.
Samples[edit]
The Long Dashes recorded on 16189 kHzKiloHertz (kHz) 10^3 Hz:
Frequencies[edit]
The dashes are usually being transmitted around these frequencies:
Additional Links[edit]
Very detailed youtube video about the signal. Most of the information for the signal entry was taken from the video (credits to FirstToken):
Additional Images[edit]
|
|
.png)
