Came across these while tuning around. They are definitely sky wave propagation because of the QSB. They appear randomly in this band segment. Recorded this using the SDR PLAY SDR with my OCF Dipole and SDR Console v3 software.
This is Radio Sanna in Arabic from Jeddah, Saudi Arabia. This was recorded in SAM mode. Watch as I change the bandwidth to help reduce neighboring interference. This was recorded using my SDR PLAY RSP, SDR Console v3, and my OCF dipole antenna, which is at approximately 35 feet.
This is OK2RZ from the Czech Republic as heard here on 6/5/2016 @ 1945 UTC on 20m. He was speaking about a hail storm there. Some of the USA stations he was working could not be copied here. I was using ,y SDR PLAY RSP with my OCF dipole and SDR Console v3 software. I turned on the LNS, (Low Noise Amplifier), which did improve the copy of his station by lowering the noise floor some.
Many of you have been asking about the “Mystery” signal. Fear not, as it is alive and well and can be heard every night around midnight ET. You can find it lurking between 4700-4800 kHz. Here it is invading the frequency of a navigational beacon. I was using my SDR PLAY and SDR CONSOLE software with my OCF dipole.