HFU HF Underground
Loggings => Latin American Pirate => Topic started by: Skipmuck on September 22, 2022, 2252 UTC
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2250 UTC Sounds like a terribly distorted AM signal....motorboat sound with OTH Radar QRM
Nothing resembling normal audio heard...almost like a jammer sound...hmmm
2256 UTC Drifting now?
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S9 on the PY2GN KiwiSDR in Brazil. This is the Brazilian station back again.
2256 UTC-Instrumental music, very poor distorted modulation (looks exactly like this station always does on this frequency on the waterfall)
2301 UTC-OFF on 6960 AM
2305 UTC-Now on 6980 AM, sounding better
2311 UTC-OFF mid song
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I was listening to this and I couldn't figure out what it was. I convinced myself that it was some sort of data transmission with "musical qualities" and let it go. Are we talking about the same thing?
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I was listening to this and I couldn't figure out what it was. I convinced myself that it was some sort of data transmission with "musical qualities" and let it go. Are we talking about the same thing?
Yes, I think we are. This is the Brazilian station that appeared for the first time Friday night has poor modulation. It has appeared on three frequencies, 6979.8, 6950v, and 6960v kHz. On 6979.8 the carrier is easily seen on the waterfall (and drifts only a little bit) and audio is just slightly distorted. On the other two frequencies distortion is very bad and there are multiple lines on the waterfall near where a carrier should be. One of them is a carrier, but I am not sure which one it is or how the others effect the sound when listening in AM mode. Tuning in SSB is impossible, it always sounds weird and has a lot of buzz. I think it is likely using a homemade crystal controlled transmitter that is designed poorly. I am not sure why modulation is so much worse on the lower frequencies, maybe damaged crystals? I have added two pictures below of the modulation. I think it is worth keeping an eye out for this station.
(https://i.ibb.co/C0YC4qf/10-D0-C3-B6-C2-A6-44-C0-931-F-5-D2764-A0-FF94.jpg) (https://ibb.co/VBznbds)
(https://i.ibb.co/G7THXTp/449-DEA58-23-AA-4853-AB5-D-F0222724441-C.jpg) (https://ibb.co/Y2Z06ZQ)
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Yes that's exactly it.
(https://i.ibb.co/C0YC4qf/10-D0-C3-B6-C2-A6-44-C0-931-F-5-D2764-A0-FF94.jpg)
To me, this looked like a multi-carrier data signal (because of the multiple "lines") that just happened to have a musical tone to it, in AM and SSB. I guess that the musical tones I heard were probably really music but the whole thing was so distorted that I couldn't figure out what was going on.
I don't know what would be causing that. I know how to create multi-tone signal but that isn't anything the average hobbyist would do. However, I guess it could be an AM signal with strong modulation at x KHz, x = whatever the spacing between the tones is. Why that would be happening unintentionally is a mystery to me.