HFU HF Underground
Loggings => 10/11 meters => Topic started by: R4002 on April 09, 2025, 1317 UTC
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Received via G8JNJ SDR today 9 April 2025, around 1300 UTC - 1305 UTC.
Frequencies given are carrier frequencies, if you're tuning in USB mode, its 1.4 kHz or 1.5 kHz down in frequency (or 2 kHz down, to make things easier) - so 26.878 MHz or 26.879 MHz instead of 26.880 MHz). I've heard of these things being heard on the 26 MHz NZ CB band (26.330 MHz - 26.770 MHz - the NZ 26 MHz band follows the regular 26.965 MHz - 27.405 MHz CB band plan, just all channels are -635 kHz). Given that these things seem to mostly follow a 5 kHz step band plan, that makes sense.
All the signals feature a multi-second tone burst (or just carrier keydown), followed by a CW identifier. The signals are all regular old CW, not modulated CW. I should just call them Morse code fishing net driftnet beacons. There are several FSK beacons also active, which are likely the same concept only they're transmitting a GPS location via fast FSK.
26.350 MHz - UNID driftnet beacon, unable to copy due to POCSAG paging signals on frequency
26.788 MHz - FSK driftnet beacon (FSK bursts)
26.822 MHz - FSK driftnet beacon (FSK bursts, exact same time as the 26.862 MHz signal)
26.838 MHz - FSK driftnet beacon
26.840 MHz - MI in Morse Code
26.862 MHz - FSK driftnet beacon (FSK bursts, exact same time as the 26.822 MHz signal)
26.880 MHz - Long keydown, followed by "NMN" in Morse (poor copy)
26.880 MHz - Long duration tone burst, followed by "UTS" in Morse Code
26.885 MHz - Long duration tone burst, followed by "RR" in Morse Code
26.890 MHz - Long duration tone burst, followed by "PCE" in Morse Code (possibly multiple beacons on this frequency)
26.890 MHz - Long duration tone burst, followed by "ECE" in Morse Code (this could be a copying error on my part)
26.895 MHz - Shorter duration keydown, followed by "IU IU" in Morse Code
short short short short long
26.965 MHz - Long duration tone burst, followed by "PCE" in Morse Code (very similar to the 26880 signal, likely part of the same network?)