We have a interfering signal on our amateurradio digimode 5357 KHz channel since a few weeks now. It is audible in Europe but also in the USA. I've seen very strong reports from stations, sometimes it is completely wiping away all the digimode FT8 signals from 5357. Annoying it is, and I've even seen some spots on the DXcluster calling it "PUTINRADAR" referring of course to Russian OHTR. But it is not a radar signal this time. It seems it is transmitted by a Israeli Naval station 4XZ from Haifa in Israel. The mode is called Israeli Navy Hybrid Modem (188-100 MOD) and was easily found using the sigidwiki signal identification guide. It is used as a broadcast transmitter to ships. Here is a recording from early this evening made just below the "FT8 channel":
Now, we know that we are 5MHz secondary users. The primary users are government and militairy stations around the world. The question is if we should continue transmitting on 60m with a naval station using almost the same frequency? Officialy we should stop all communication if a primary station is using the frequency. Although I'm not shure if they suffer any QRM from amateurradio FT8 signals? What do you think?