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Jon_G4MDC · 19th Nov 2022, 11:25 am

Fish pond UV tubes with SMPS supplies create many spurs on the 70MHz band all spaced 35kHz apart.

On the incandescent bulbs there is some VHF oscillation mechanism that happens with them.

https://www.ofcom.org.uk/about-ofcom...rference-issue

19th Nov 2022, 11:25 am	#30
Jon_G4MDC Nonode Join Date: Nov 2015 Location: Welwyn Garden City, Hertfordshire, UK. Posts: 2,015	Re: Valve amplifier picking up EMI/RFI Fish pond UV tubes with SMPS supplies create many spurs on the 70MHz band all spaced 35kHz apart. On the incandescent bulbs there is some VHF oscillation mechanism that happens with them. https://www.ofcom.org.uk/about-ofcom...rference-issue