This is an OTHR, but not PLUTO 2. PLUTO 2 does not go below 8000 kHz.
This is the Russian 29B6 Container radar. The actual modulated width is fairly narrow, only about 14 kHz. However, it is FMOP vs the FMCW of some other radars, so there is more splatter invovled.
29B6 started on that frequency, on 20 June, at about 2300z, and went off that freq at about 0220z, on 21 June.
T!