UNID 9000 kHz 1914 UTC 11 Jan 2019

[IQ_imbalance]

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. 

[CaptnKliegle]

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.

[Traveling Wave]

1739 UTC- 9000 kHz signal S5 in WNY.

[IQ_imbalance]

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?

[R4002]

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. 

[Token]

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!

[IQ_imbalance]

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.....

[Josh]

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!

And this is why we need a net of people who can df the old fashioned way.