SAQ Grimeton: wideband recordings from centennial available
In the COHIRADIA archive there are now two new AM-wideband recordings from 2024-12-01 which contain the signal from SAQ Grimeton on 17.2 kHz while airing a special message during its centennial of the first commercial transatlantic transmission in 1924 (full story see here). Recording 1 was made by Walter Barteczek in Neunkirchen-Seelscheid (D) and contains a VLF-wideband IQ-file extending from 10 – 60 kHz with a clear and well-readable signal. Recording 2, made by Hermann Scharfetter in Graz (AT), extends from 10 – 260 kHz. It contains, in addition to VLF, the LW band including several LW broadcasting stations. The SNR of SAQ in recording 2 is surprisingly good, reaching approx. 30dB.
Both recordings can be downloaded freely and played back with software for software defined radios (e.g. SDRUno) and contain the complete frequency spectrum which was received at the respective QTHs. They can also be played back on analogue equipment when using the hardware/software platform supported by COHIRADIA.
Footnote: The files, though having the extension ‘wav’, are no audio files and thus cannot be played back with standard audio players. Use SDRUno, SDR#, SDR-Angel, HDSDR or similar tools.
Hermann Scharfetter (2024-12-03)