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 permissible in your locale.

Author Topic: 6945 USB 0347 UTC 14 Aug 14 Link-11?  (Read 2875 times)

Offline IQ_imbalance

  • Sr. Member
  • ****
  • Posts: 345
  • Central MD
    • View Profile
6945 USB 0347 UTC 14 Aug 14 Link-11?
« on: August 14, 2014, 0349 UTC »
Ok maybe not link 11.  Sstv instead?  good signal into central md
LOG/NE-SW unterminated BOG/DJ-130/800Mhz Yagi
AFEDRI SDR-Net ICF-SC1 SDS-200 various RTL-SDR
Central MD

Offline glimmer twin

  • DX Legend
  • ******
  • Posts: 1089
  • "I found my way to heaven , I did my time in hell"
    • View Profile
Re: 6945 USB 0347 UTC 14 Aug 14 Link-11?
« Reply #1 on: August 14, 2014, 0448 UTC »
Sounds like an FSK (RTTY) signal to me. It might be a STANAG xxxx (1241  maybe...I can't recall that designation)  station. I can't tell without firing up my SDR and seeing it in the waterfall. I left my SDR IQ at the little womans QTH.
KCMO  Icom R 75 , SDR-IQ, Grundig Satellit 750 ,Tecsun PL 880, Tecsun PL660 , Tecsun PL380 & PL360  10 meter random wire  w/ RF systems MLB    Alpha Delta SWL DX sloper  
qsl   keithglimmer810@gmail.com

gentlemen,you can not fight in here, this is the war room

Offline IQ_imbalance

  • Sr. Member
  • ****
  • Posts: 345
  • Central MD
    • View Profile
Re: 6945 USB 0347 UTC 14 Aug 14 Link-11?
« Reply #2 on: August 14, 2014, 1240 UTC »
My wife was asleep...that precluded me running audio for comparison....
LOG/NE-SW unterminated BOG/DJ-130/800Mhz Yagi
AFEDRI SDR-Net ICF-SC1 SDS-200 various RTL-SDR
Central MD

Offline ChrisSmolinski

  • Administrator
  • Marconi Class DXer
  • *****
  • Posts: 31106
  • Westminster, MD USA
    • View Profile
    • Black Cat Systems
Re: 6945 USB 0347 UTC 14 Aug 14 Link-11?
« Reply #3 on: August 14, 2014, 1526 UTC »
I've noticed RTTY (FSK) here off and on in the past, and it was present all last night on the SDR recording. It's about the same strength as the Link-11 that is found here, so perhaps the transmitter QTH is the same.

Chris Smolinski
Westminster, MD
eQSLs appreciated! csmolinski@blackcatsystems.com
netSDR / AFE822x / AirSpy HF+ / KiwiSDR / 900 ft Horz skyloop / 500 ft NE beverage / 250 ft V Beam / 58 ft T2FD / 120 ft T2FD / 400 ft south beverage / 43m, 20m, 10m  dipoles / Crossed Parallel Loop / Discone in a tree

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 2118
    • View Profile
Re: 6945 USB 0347 UTC 14 Aug 14 Link-11?
« Reply #4 on: August 15, 2014, 1412 UTC »
STANAG 4481 FSK, 850 Hz shift, with KG-84 frames and encrypted.  While many people call this RTTY, and it looks and sounds just like old RTTY, it is not really RTTY anymore, but a true data transfer protocol that never hits or originates from a teletype.

Both the bearing and the signal level are consistent to be the same source as the Link 11 seen on freq.  While not the only users the US Navy or USCG are the most likely source.

T!
T!
Mojave Desert, California USA

Offline IQ_imbalance

  • Sr. Member
  • ****
  • Posts: 345
  • Central MD
    • View Profile
Re: 6945 USB 0347 UTC 14 Aug 14 Link-11?
« Reply #5 on: August 16, 2014, 0257 UTC »
Well now I want a portable loop .....
LOG/NE-SW unterminated BOG/DJ-130/800Mhz Yagi
AFEDRI SDR-Net ICF-SC1 SDS-200 various RTL-SDR
Central MD

 

HFUnderground T-Shirt
HFUnderground Garden Flag
by MitchellTimeDesigns