High RF Activity

[Ray]

Hello, 

We have seen some high RF activity on this livestream https://www.youtube.com/watch?v=I0uQETHfbE0 at around midnight on 18th July 2021 for around 2 and a half hours. What is your take on this?

Kind Regards,

Ray

[Andrew Mount]

Ray,

Where is your receiver located?

The source of the RFI is unknown.  My leading hypothesis is Sporadic E related to geoelectric field perturbations.

Since mid June to present my observatory located in Mountain Rest,South Carolina at approx 35N and 83W has been detecting strong RF signals at 62.260 Mhz.  Further investigation has ruled out satellite transit emissions although Star link  trains are detectable but are  short lived in duration as compared to the persistent RFI. This problem has forced shutdown of the radio meteor system here in order to protect the instrumentation.

The observatory has also observed a band of RFI that is seen in our spectograhic tracings  centered at 27.5 Mhz. It mostly appears 2 hours after sunrise and is present during  daylight hours. This band is not related to solar or jovian  radio emulations or  cass A or Tycho scintillations which we  track. It is correlated to the RFI emissions at 62.260 Mhz.

Examination of NOAA space weather data indicates that the geoelectric field 1 minute data model may be of some interest, if you are located in CONUS.  Although correlations of what is called Spordiac E RFI at 62.260 Mhz have not been tested here, visual inspection suggests that it may be related to what you are seeing. 

Please let me know what you think!

Best wishes, 

Andy Mount

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[Denny - K0LGI -]

Those likely are meteor return signatures that are derived from the older NTSC analog video carriers where few are still operating on the frequencies included in the video. The normal channel 2 video carrier is 55.250 MHz, however some were offset by + or - 10 KHz for improved interference reduction between adjacent or nearby, TV transmitters operating on the same channel.

The correlation between the low VHF and the lower HF frequency observed is not that unusual as ionized meteor paths often propagate lower frequencies as well.

Denny - K0LGi -

[Ray]

Thank you for taking the time to reply.

Just to provide some further information. The kit is not actually mine but I am in touch with the owner.  The RF Receiver is located in Northern Virginia (Washington, D.C. Metro area), this is the setup. Its tuned to 55.24 MHz.

In case you missed it, the recorded video of the live stream is now available here for further study: https://mega.nz/file/1tJRBawB#x7pg7FALfGE8ajRP1ChQS-5Q3X7rUvmtTVyvtSITzYM

[Andrew Mount]

I watched and listened to the video that was sent along. The signal intensity and broad banding was remarkable!   Perhaps you could try Spectrum Lab to post process the data to help discern the signals?