Laptop, running Windows 10. The antenna was connected to the microphone input via a series resistor. Running on battery was essential, as the charger caused considerable interference.
| Loop antenna, made
from 3 turns of CAT6 cable. The 8 wires in the cable are
interconnected to form 24 turns of wire enclosing an area of about
1.7 m2.
Laptop, running Windows 10. The antenna was connected to the microphone input via a series resistor. Running on battery was essential, as the charger caused considerable interference. |
|
| The HDSDR program, taking sound card input, in CW mode, AGC off, recording the RF signal. The SAQ signal can be seen at 17.2 kHz at the top right corner. |
 |
The RF recording (110 MB): HDSDR_20221116_145959Z_0kHz_RF.wav
Audio output, created offline from the RF recording, bandpass filtered to 700±150 Hz: HDSDR_20221116_150000Z_17kHz_AF.wav
Decoded from the RF signal, using gerke-decoder 3.0.0, with options -l 569 -F 17150,17250: HDSDR_20221116_145959Z_0kHz_RF-decoded.txt
cq cq cq de saq saq saq = this is grimeton radio station/saq in a
transmission using the alexanderson 200 kw alternator on 17.2 khz. = the
16th of november 2022 marks the 50th anniversary of the world herttage
convention. unesco world heritage sites are irreplaceable assets of
humanity but many of them are threatened today through uncontrolled
urbanization, uncsecked tourism, armed conflict and climate change. to
ensure their protection, international cooperation to promote peace,
international understanding and sustainable development is more
important than ever. = signed: lena sommestad, chair swedish national
commission for unesco, world heaitage grimeton radio station and the
alexander-grimeton friendship associatteeon. = for qsl info please read
our website: www.alexander.n.se + de saq saq saq <SK>
Frequency vs time, plotted using the -Y option, varied between 17191 and 17199, with a slowly decreasing trend.