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Re: [Discuss-gnuradio] Tuning in VLF with a sound card
From: |
John Coppens |
Subject: |
Re: [Discuss-gnuradio] Tuning in VLF with a sound card |
Date: |
Wed, 15 May 2019 14:18:53 -0300 |
On Thu, 2 May 2019 16:22:24 -0400
Brad Hein <address@hidden> 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
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, (continued)
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, address@hidden, 2019/05/02
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Kevin Reid, 2019/05/02
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Ben Hilburn, 2019/05/07
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Brad Hein, 2019/05/07
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Marcus D. Leech, 2019/05/07
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Brad Hein, 2019/05/08
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Albin Stigö, 2019/05/08
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Brad Hein, 2019/05/08
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Albin Stigö, 2019/05/08
- Re: [Discuss-gnuradio] Tuning in VLF with a sound card, Marcus D. Leech, 2019/05/08
Re: [Discuss-gnuradio] Tuning in VLF with a sound card,
John Coppens <=