Talk:HF trading link '350 Hz idle tone'
I believe this is HFHigh Frequency (3-30 MHz) trading - Z345
Ive gotten many accounts and claims that this was an "HFHigh Frequency (3-30 MHz) trading link". I dont believe that this and the other page match to a data signal thats even remotely close to an HFHigh Frequency (3-30 MHz) trading link of sorts. In my ears it sounds like the CMOR radars in canada, but with a higher pitch. It also has the same fading characteristics, and pulse characteristics. I dont see any OFDMOrthogonal Frequency-Division Multiplexing data embedded, otherwise I would have heard modulated data.
The reason why there is no data to be seen is because this transmission is assumed to be in idle state. It would be different when actual data is transmitted.
For example CISCommonwealth of Independent States (CIS), the former Soviet Republic-12 doesn't transmit anything except plain tones in its standby mode.
The reasons why this is not radar are stated in the reddit threads (links in article):
1) There is a gap in the middle of the spectrum and radars don't usually have such a gap
2) The signal has been observed on HFHigh Frequency (3-30 MHz) trading frequencies
If this information is not enough for identification we can keep this in UNID.
This is not CMOR but could be another type of radar. I don't think it is, but we can wait for more information. Emcbro (talk) 03:16, 9 April 2025 (NZST)
Emcbro It would be best if we awaited further confirmation on this and the 120 hz tone one. Any FMCW waveform is most likely going to belong to a radar. FMFrequency Modulation continuous wave usually doesnt contain any data. Besides, when I looked at any trading links, they usually arent conformed to an FMCW tone. Heres a site that mentions use of microwaves to send trading info with 50 years ago tech: https://anovanetworks.com/high-frequency-traders-use-50-year-old-wireless-tech/. Also, it wouldnt be possible for a huge bandwidth signal, (350 hz variant), to belong to a huge data link in the middle of HFHigh Frequency (3-30 MHz). Most signals in HFHigh Frequency (3-30 MHz) dont usually exceed more than 48 Khz, such as the case with this: https://youtu.be/TSXHbjHmS_I?si=3PCf8hStkoN8CG51/.
Ive also never seen a radar on HFHigh Frequency (3-30 MHz) exceed 48 Khz.
