INSPIRE Receiver from NASA

[athornett]

Does any one else have of these? I do - very good at picking up lightening and other natural radio.

However I also pick up mains frequency which tends to dominate. Anyone know how to filter this out?

Andy

[NickK]

Could a FFT be used to filter out the regular frequencies?

[robin_astro]

Could a FFT be used to filter out the regular frequencies?

Yep software filters are one weapon in the armoury to drive down the mains hum harmonics in VLF reception. I have not worked in this area of the spectrum myself but Paul Nicholson's notes here could be useful

http://abelian.org/vlfrx/

but they are quite old now and I expect there are other software solutions around these days. (He is still active in VLF I believe)

Cheers

Robin