HFU HF Underground

Loggings => Other => Topic started by: Dag on April 06, 2014, 2348 UTC

Title: Massive OTH? 30 m (audio + spectrogram available)
Post by: Dag on April 06, 2014, 2348 UTC

This signal was s9 for about 7 minutes at 2330 to about 2343z  ( local 7:30 pm EDT to 7:43 pm EDT).

This is the link https://onedrive.live.com/#cid=F98FA31C5C423B77&id=F98FA31C5C423B77!102 (https://onedrive.live.com/#cid=F98FA31C5C423B77&id=F98FA31C5C423B77!102) to the spectrogram and short audio.

Can someone confirm that this was OTH?

Title: Re: Massive OTH? 30 m (audio + spectrogram available)
Post by: glimmer twin on April 07, 2014, 1008 UTC

It certainly looks & sounds like the PLUTO OTHR from Cyprus.

Title: Re: Massive OTH? 30 m (audio + spectrogram available)
Post by: Token on April 22, 2014, 0259 UTC

It is an OTHR.  It is FM and might be FMCW or FMICW/FMOP, the bandwidth of the audio is too narrow to confirm.  It is using a 50 Hz sweep rep rate.  While there are several possibilities that fit the bill the two front runners would be the PLUTO II British radar from Akrotiri or the Russian 29B6 radar.  My guess, based on the chirp rate that is seen (how fast the radar shifts frequency in one pulse) is that this is the 29B6.  However without wider audio it is hard to say one or the other.

T!