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] 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 > >
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