Radar, Nostradamus OTHR, 10420 kHz, September 18, 2011, 1610 UTC
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All Comments (7)
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Wow, I just discovered you channel the other day and I've found myself watching all of your videos - Numbers stations are particularly intriguing!
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I have many recording of this radar made with NetSDR, converted to baseband with Rockwell Collins 95S-1A and wavewforms recorded with Sonar Studio.They will be posted on one of my blogs soon.
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What's the pulse repetition frequency ?
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1:00
Oddity Station, Chinese, unknown purpose, September 30, 2011, 1304 UTC, 5449 kHz USBby FirstToken323 views- 1:23
OTH Radar Nostradamus on 10405 kHzby Prizmatic0353 views
- 0:51
Oddities Station, HAARP, multiple waveforms, September 13, 2009, 2750 kHzby FirstToken562 views
- 1:19
Radar, 10 Chinese OTHRs, May 20, 2011, 1150 UTCby FirstToken529 views
- 1:02
Strange transmission on 3630 kHzby Prizmatic07,553 views
- 4:57
Nostradamus, the french skywave over the horizon radarby nostradamusradar5,991 views
- 3:56
Whistlers (Shortwave anomalies) viewed on SDRby Prizmatic0424 views
- 1:10
Numbers Station, Russian, XPA, 20 bd, October 08, 2011, 1320 UTC, 10736 kHz, USB Modeby FirstToken305 views
- 0:50
Multipath propagation. EAM on 8992 kHzby Prizmatic0518 views
- 0:39
Parallel transmission on at least two HF military frequencies.by sq6nte1,486 views
- 3:28
HAARP?, AUSTRALIA, 22 JAN. 2010by catnotman14,070 views
- 0:09
Radar, CODAR x2, 4550 kHz cf, March 08, 2009, 0822 UTCby FirstToken397 views
- 1:47
28 MHz strange signalsby py2zx172 views
- 0:56
RADAR NOSTRADAMUS FRANCIA en 27 Mhz.by martin10sd15675 views
- 1:51
Radar, finding radars with the Excalibur wideband spectrum display, June 17, 2011, 1341 UTCby FirstToken766 views
- 0:41
Radar, Chinese OTHR, 6965 kHz, November 28, 2010, 1441 UTCby FirstToken360 views
- 2:13
OTHR Radar Interferance on 40Mtrsby jashoon10,267 views
- 1:33
10 MHz OTH Radar causing QRM in EUby m0taz99630 views
- 0:59
EAM transmission with CODAR like radar interference, 11175 kHz, June 17, 2011, 1355 UTCby FirstToken412 views
- 0:35
RUSSIAN RADAR AKA WOODY WOODPECKER - HF/SHORTWAVE/HAM RADIO INTERFERENCEby id780138,021 views
Recording a real time OTH Radar signal requires a receivcer capable of 20 KHz bandwidth SSB demdulation. USB demodulation translates
radar's baseband signal to 0 to 20 KHz frequency band. The signal itself is
not an ON-OFF pilse signal, as it appears on this clip due to unproper demidulation, it is a Progressive Linear Frequenvy Modulatiin (LFM) signal. Again, due to an "amateur" origin of the receiver, the signal appears to be not clean. This has nothingn to do with reality. Thanks for posting
DonAnzalone 4 months ago
@DonAnzalone The purpose of the video is to assist potential listeners who hear it in identification. As such, most of them will be listening in either AM or SSB and with a limited bandwidth, probably about 3 kHz or so.
The receiver used for this video is capable of over 50 kHz of instantaneous demodulated bandwidth. Diagnosis of the I/Q recorded signal will allow up to 1.6 MHz of instantaneous bandwidth.
Other radars can require significantly more bandwidth, over 20 kHz is common.
FirstToken 4 months ago
@DonAnzalone It is fairly clear this signal is over 20 kHz wide, the 3 dB points are at least 40 kHz. And while many HF radars are indeed LFMCW this (Nostradamus) is one of the few that is listed in Skolnick's Radar Handbook as "coded pulse". I suspect your recordings of LFMCW OTHRs that can be demodulated in 20 kHz of bandwidth are of other types, such as JORN, WERA, CODAR, etc, and not specifically this one, Nostradamus.
FirstToken 3 months ago