This OTH radar was noted on 29790.0 Khz (center frequency), bandwidth about 20 Khz and mode FMCW. The sweep-rate of the system, at least at this scan session, was 25 sweeps/sec.
The spectrum reveals two interesting features related to the heard scan-session:
1) the sweeps are down-chirp, i.e. the signal varies it frequency from the higher value to the lower value;
2) looking more closely at the spectrum by zooming a portion of frequency, we may see not only the short-path (direct) signal, obviously, but also the back scatter signals (the returned echoes) that are characterized by very low values of energy. This is clearly visible below:
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