HF oddities to SigID Wiki

[northern_dxer]

Hi all,

I have encountered several strange signals while browsing the HF and low VHF spectrum. I have collected them to SigID wiki and I thought that people on this forum might be able to identify them. If these can be identified, they can be renamed and sorted in the wiki.

All have been recorded in northern Europe and in many cases I have added links to videos or sources made by other people who have seen these.


1. MFSK-11 data mode, very similar to XPB and other supposedly Russian modes. Should we just call this "CIS MFSK-11" until we have a better name?
https://www.sigidwiki.com/wiki/Unknown_14p986_MFSK-11

2. Unknown data mode on the low VHF band. Already suspected to be Mobitex but this has not been confirmed.
https://www.sigidwiki.com/wiki/Unknown_33p075_low_VHF_band_data_signal

3. Unknown data mode on HF, transmitted in bursts.
https://www.sigidwiki.com/wiki/Unknown_12p164_HF_data_mode

4. A supposedly Russian data mode with very interesting spectrum pattern. According to other sources, it uses OFDM for data transmission. There are also MFSK and frequency sweeps. Is there an official or a commonly agreed name for this?
https://www.sigidwiki.com/wiki/Unknown_Russian_HF_data_mode_with_MFSK_and_OFDM_and_freq_sweeps

5. Slow sweeping FMCW radar on many bands, appeared in 2024. Marine research or military?
https://www.sigidwiki.com/wiki/Unknown_15p050_FMCW_radar_resembles_CODAR

6. Lower HF band radar, some similarities with CODAR but still quite different.
https://www.sigidwiki.com/wiki/Unknown_4p18_radar

7. Weak HF radar with 48 kHz bandwidth, unfortunately no better sample available.
https://www.sigidwiki.com/wiki/Unknown_10p6_weak_radar_48kHz_wide

8. Low VHF band radar with pulsed transmission. Military OTH/long range radar?
https://www.sigidwiki.com/wiki/Unknown_38MHz_and_35MHz_low_VHF_band_radar_94kHz_to_100kHz_wide

9. Narrow FMCW radar on low VHF. No distinguishing features.
https://www.sigidwiki.com/wiki/Unknown_33p36_narrow_FMCW_radar

10. Sweeping (stepping) HF sounder, similar to Digisonde but has some differences. Seems to transmit 40 Hz pulses. Is this just Digisonde? 
https://www.sigidwiki.com/wiki/Possible_digisonde_or_other_sounder_8p4

11. Strange data mode or jammer? Resembles CIS-12 and similar data signals, but is often found on broadcast frequencies and looks rather messy with an ambiguous number of tones. A similar but weaker and less "messy" signal has been spotted on the "UVB-76" frequency lately.
https://www.sigidwiki.com/wiki/Unknown_11p935_suspected_broadcast_jammer_or_idling_data_mode

12. Low VHF band radar with more or less irregular pulse pattern. A research radar perhaps?
https://www.sigidwiki.com/wiki/Unknown_30p745_low_VHF_band_radar_with_irregular_pulse_pattern

13. Another low VHF band suspected research radar, this time with regular pulse pattern.
https://www.sigidwiki.com/wiki/Unknown_36MHz_low_VHF_band_radar_with_pulse_pattern

14. Likely HF FMCW radar with 120 Hz sweeprate.
https://www.sigidwiki.com/wiki/Unknown_20p24_probably_FMCW_radar_120Hz_sweep_rate

15. Wideband pulsed HF radar-like signal that starts with a slower pattern
https://www.sigidwiki.com/wiki/Unknown_12p6_pulsed_radar-like_signal_180kHz_wide_with_starting_pattern

 

[northern_dxer]

I consider number 4 identified as it seems to be quite known in the UDXF community, even though official name is not known.

I spotted two more low VHF band radars which I think I may have identified:

16. Suspected meteor detection radar, possibly SKiYMET radar:
https://www.sigidwiki.com/wiki/Unknown_36p2_suspected_SKiYMET_meteor_detection_radar

17. Another suspected meteor detection radar, quite possibly SIMONe spread-spectrum radar:
https://www.sigidwiki.com/wiki/Unknown_32p55_radar-like_signal_possibly_SIMONe_meteor_radar


Those may not be very interesting to most DXers but then there's a strange signal that has recently appeared on broadcast frequencies. It has been spotted by many people and some suspect that it might be Link-22. But that has not been confirmed.

18. Jammer, test transmission or data? R2-D2 on HF?
https://www.sigidwiki.com/wiki/Unknown_13p57_robot-like_beeping_signal

[BoomboxDX]

Very interesting samples of signals. Thanks for posting this.