Accurate positioning by Low Frequencies (ALF)

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Accurate positioning by Low Frequencies (ALF)
ALF-RDS.jpg
Frequencies 123.7 kHzKiloHertz (kHz) 10^3 Hz123,700 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.124 MHzMegaHertz (MHz) 10^6 Hz
123.7 kHzKiloHertz (kHz) 10^3 Hz
0.124 MHzMegaHertz (MHz) 10^6 Hz
123.7 kHzKiloHertz (kHz) 10^3 Hz
0.124 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 123.7 kHzKiloHertz (kHz) 10^3 Hz123,700 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.124 MHzMegaHertz (MHz) 10^6 Hz
- 123.7 kHzKiloHertz (kHz) 10^3 Hz123,700 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.124 MHzMegaHertz (MHz) 10^6 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation PSKPhase-Shift Keying
ACFAutoCorrelation Function
Bandwidth 2100 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).2.1 kHzKiloHertz (kHz) 10^3 Hz
0.0021 MHzMegaHertz (MHz) 10^6 Hz
2.1 kHzKiloHertz (kHz) 10^3 Hz
0.0021 MHzMegaHertz (MHz) 10^6 Hz
2.1 kHzKiloHertz (kHz) 10^3 Hz
0.0021 MHzMegaHertz (MHz) 10^6 Hz
Location Germany
Short Description Accurate positioning by Low Frequencies, a former German DGPS navigation system. No longer in use as of 2013.
I/Q Raw Recording
Audio Sample
Accurate positioning by Low Frequencies, a former German DGPS navigation system. No longer in use as of 2013

The system serviced all of Germany, with a 600 km - 800 km range from the transmitting antenna near Frankfurt.

This signal operated at 1187.6 BaudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. and used BPSKBinary Phase-Shift Keying (1 bit per symbol) modulation. This signal also used the RDS format used in commercial FMFrequency Modulation sidebands for the low bitrate dissemination of information. This version of RDS was transmitted in SSB with a decreased pilot level to reduce the bandwidth.

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Professional Equipment/Software

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