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Author Topic: UNID 9000 kHz 1914 UTC 11 Jan 2019  (Read 257 times)

Offline IQ_imbalance

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UNID 9000 kHz 1914 UTC 11 Jan 2019
« on: January 11, 2019, 2017 UTC »
Maybe our 8000kHz carrier moved to a new frequency?  -87dBm here, started around 1914 UTC 11 Jan.  The spectrogram looks very similar. TDoA is all over the place, but seems to converge in the midatlantic area somewhere. 


« Last Edit: January 11, 2019, 2039 UTC by IQ_imbalance »
LOG/NE-SW unterminated BOG
AFEDRI SDR-Net
Central MD

Offline CaptnKliegle

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #1 on: January 12, 2019, 1654 UTC »
16;51Z 1/12/2019   -51dBm in NH on a 51' vertical wire.  -67dBm on a 124'EFW at +100' AGL in an E/W configuration.

The 8000 kHz carrier not existent at this time at all.


« Last Edit: January 12, 2019, 1656 UTC by CaptnKliegle »
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Offline Traveling Wave

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #2 on: January 12, 2019, 1741 UTC »
1739 UTC- 9000 kHz signal S5 in WNY.
Location: Western New York ( Niagara Frontier)
Radio :TS480 with RTL-SDR pan-adapter, HDSDR, Omni-Rig Control,Zenith T/O R600
Antenna: 40m dipole, 20-17-15 meter fan dipole

Offline IQ_imbalance

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #3 on: January 12, 2019, 1823 UTC »
Has it moved again?  Would be nice to catch some indication on the spectrum that there was a switch.....

Any TDoA experts care to weigh in?  Are we just chasing timing errors or is this carrier really being broadcast at multiple sites?

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Offline R4002

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #4 on: January 12, 2019, 1949 UTC »
Strong carrier on 9000 kHz at 1930 UTC 12 Jan 2019 tune-in time, still going strong at 1948 UTC with S9+10db signal on the COMMSIGMA KiwiSDR on the CT/MA border.  No modulation or anything else, just a steady carrier. 
U.S. East Coast, various HF/VHF/UHF radios/scanners/receivers

Offline Token

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #5 on: January 12, 2019, 2015 UTC »
The spectrogram picture posted looks to me like a featureless carrier, the "features" look like Doppler shift in reflected energy from aircraft.

I am no expert, but at a guess the TDOA results are all over the place because there is no modulation.  If there are indeed no features on the carrier, just a dead carrier, the Kiwi TDOA techniques, as I understand them, cannot be applied.  So yeah, you can TDOA away, but the answers will be wrong, or at best a lucky guess.

T!
T!
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Offline IQ_imbalance

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #6 on: January 12, 2019, 2021 UTC »
Thanks!!  No point chasing TDoA if it's just analyzing noise. 

One update....there's some drift in the carrier this afternoon.  Looks like it's a few Hz below 9000kHz now, but drifting back up.....
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Offline Josh

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Re: UNID 9000 kHz 1914 UTC 11 Jan 2019
« Reply #7 on: January 12, 2019, 2038 UTC »
The spectrogram picture posted looks to me like a featureless carrier, the "features" look like Doppler shift in reflected energy from aircraft.

I am no expert, but at a guess the TDOA results are all over the place because there is no modulation.  If there are indeed no features on the carrier, just a dead carrier, the Kiwi TDOA techniques, as I understand them, cannot be applied.  So yeah, you can TDOA away, but the answers will be wrong, or at best a lucky guess.

T!

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