Hi Marcus, That’s great. What could you hear/detect with the 90 kHz bandwidth?
Glen > On May 15, 2019, at 5:28 PM, Marcus D. Leech <patchvonbr...@gmail.com> wrote: > > On 05/15/2019 03:23 PM, Brad Hein wrote: >> Great suggestion thank you! This also gives me new topics to read up on as I >> am still a VLF amateur. >> >> [Sent from mobile device] > I used a Berhringer "mini-MIC" microphone amplifier, which has a balanced, > XLR, input, and has bandwidth out to > about 90kHz. Worked a champ. Not as cheap as a DIY op-amp+transformer > approach, but more convenient, > to be sure. > > >> >> On Wed, May 15, 2019, 1:20 PM John Coppens <j...@jcoppens.com wrote: >> On Thu, 2 May 2019 16:22:24 -0400 >> Brad Hein <linuxb...@gmail.com> wrote: >> >> > I took a Raspberry Pi and attached a 48KHz USB sound card, with a big >> > magnetic loop antenna fed into the mic. >> >> Just a suggestion: If you have a loop antenna, which is a symmetrical >> antenna, >> and couple it to an asymmetrical input (MIC), you will make the antenna >> more sensitive to static noise. I'd suggest you use either a transformer or >> an 'instrumentation amplifier' with an operational amplifier to convert >> the signal from the antenna to asymmetrical signal. >> >> A transformer would be easiest to install at the base of the antenna (no >> need for a supply). The op-amp amplifier would cover a larger bandwidth. >> (it would also offer some protection for your computer). >> >> John >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
