We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.

Author Topic: UNID 6960 AM? 2250 UTC 22 SEP 2022  (Read 104 times)

Offline Skipmuck

  • Global Moderator
  • Marconi Class DXer
  • *****
  • Posts: 10164
    • View Profile
    • Email
UNID 6960 AM? 2250 UTC 22 SEP 2022
« on: September 22, 2022, 2252 UTC »
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?
« Last Edit: September 22, 2022, 2257 UTC by Skipmuck »
QSL's to poorbrookking@aol.com are greatly appreciated! All reception and postings using My radio, My antenna, and generally in real time(excluding posting of SSTV images!).
QTH:Springfield, MA
JRC NRD-515 with 43 meter half wave dipole into MFJ 949E Versa Tuner: also Grove SP-200 & SONY 2010's

Offline Shortwave_listener

  • DX Legend
  • ******
  • Posts: 1143
  • British Columbia, Canada
    • View Profile
Re: UNID (Brazil) 6960 AM 2250 UTC 22 SEP 2022
« Reply #1 on: September 22, 2022, 2257 UTC »
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
« Last Edit: September 23, 2022, 0227 UTC by Shortwave_listener »
Songs are identified with Shazam if needed. I usually use KiwiSDR receivers. Reception from my QTH is using a Sony ICF-2010 with an 11 meter inverted V antenna.
Shortwave Radio Archive: https://www.youtube.com/channel/UCzMvFozIEJobfl6kaljIEUw/featured

Offline Charlie_Dont_Surf

  • Sr. Member
  • ****
  • Posts: 367
  • Charlie's Point, California
    • View Profile
Re: UNID 6960 AM? 2250 UTC 22 SEP 2022
« Reply #2 on: September 23, 2022, 0122 UTC »
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?
« Last Edit: September 23, 2022, 0124 UTC by Charlie_Dont_Surf »
I don't STRETCH the truth.

"Every minute I spend in this room, my signal gets weaker.
Every minute Charlie squats in the bush, his signal gets stronger."

Offline Shortwave_listener

  • DX Legend
  • ******
  • Posts: 1143
  • British Columbia, Canada
    • View Profile
Re: UNID (Brazil) 6960 AM 2250 UTC 22 SEP 2022
« Reply #3 on: September 23, 2022, 0227 UTC »
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.

« Last Edit: September 23, 2022, 0228 UTC by Shortwave_listener »
Songs are identified with Shazam if needed. I usually use KiwiSDR receivers. Reception from my QTH is using a Sony ICF-2010 with an 11 meter inverted V antenna.
Shortwave Radio Archive: https://www.youtube.com/channel/UCzMvFozIEJobfl6kaljIEUw/featured

Offline Charlie_Dont_Surf

  • Sr. Member
  • ****
  • Posts: 367
  • Charlie's Point, California
    • View Profile
Re: UNID 6960 AM? 2250 UTC 22 SEP 2022
« Reply #4 on: September 23, 2022, 0406 UTC »
Yes that's exactly it.



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.
I don't STRETCH the truth.

"Every minute I spend in this room, my signal gets weaker.
Every minute Charlie squats in the bush, his signal gets stronger."

 

HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns