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FRB024 > SWL 20.09.22 12:01l 28 Lines 985 Bytes #999 (0) @ WW
BID : 881_FRB024
Read: GAST
Subj: MULTIMODE PSK? and OFDM, 6874khz & 6883khz #digital #unid
Path: DBO595<DBX320<RM0BOX<CB0HAL<DBX320<MD2BBS<FRB024
Sent: 220919/0707Z 881@FRB024.#24.FGAQ.FRA.EU.WW BPQ6.0.23
scanning HF, I find this... what I think are psk bursts... and then a
very interesting looking OFDM, at 6874khz, then once it stopped
transmitting, it moved to 6883khz
I used my tecsun pl-600 radio and longwire antenna to receive this, and
because the pl-600 has a built in low pass filter, higher frequencies
are weaker.
link to recordings:
https://drive.google.com/file/d/1YcfN3E1J8m8CaGLn4tZtaWwFBLHXm3Vg/view?usp=sharing
<https://drive.google.com/file/d/1YcfN3E1J8m8CaGLn4tZtaWwFBLHXm3Vg/view?usp=sharing>
https://drive.google.com/file/d/1yGED3Y_G3A2PszoJIenn07FFmtmJBScU/view?usp=sharing
<https://drive.google.com/file/d/1yGED3Y_G3A2PszoJIenn07FFmtmJBScU/view?usp=sharing>
baud rate of PSK bursts: 2400hz
baud rate of OFDM: 580hz (info from SA OFDM: LS=409 LG=60 Br=21.325
Sh=24.991)
looking at the OFDM, there are 14 "off" channels
more detail: ["on" channels: 1-4, 8-16, 18-23, 25-35, 37-44, 46-47,
49-60, 62, 64-68, 70-73, 75-77, 79-82, 84-121]
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