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Wednesday, December 11, 2013

Radar, possible US ROTHR, 8051 kHz center frequency, 100 kHz wide FMCW, ...



Radar, possible US ROTHR, 8051 kHz center frequency, 100 kHz wide FMCW, September 14, 2013, 1032 UTC
      

Published on Dec 11, 2013
This is an FMCW HF radar, 100 kHz wide sweep, 8051 kHz center frequency. Burst sent about every 2 minutes on average. This might be the US ROTHR (Relocatable Over The Horizon Radar) but that is hard to confirm. This is the same three transmission viewed several times. First all three are presented with the receiver in USB, then all three in LSB, then two in AM, and finally the center burst only again n USB, but with RX tuned 1 kHz low so that the pre-burst tones can be heard. Note that the first and third burst in the sets did not have these pre-tones, only the second burst I this set did.

a comment from youtube...
MakeTimeToMakeTime , the 8000Khz range is mostly maritime stations and civil air traffic control that use CW(morse), SITOR(Simplex Teletype Over Radio), and USB(Upper Sideband). Most likely, it could be martime or civil air voice on USB
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