PlanarMetamaterials
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Hello,
I'm looking for a simple modem (e.g., RS-232 in, modulated analog out; and vice-versa) that operates at VLF (audio) frequencies. Really my only requirements at this point are that it must be able to detect weak signals, i.e., sensitivity lower than -100 dBm, and it should be relatively inexpensive (< $500) - anything else is negotiable, including data rates. I'm having a hard time finding such a device that's not a homemade Arduino/Pi project with questionable sensitivity (e.g.
). Would anyone have other suggestions?
I'm looking for a simple modem (e.g., RS-232 in, modulated analog out; and vice-versa) that operates at VLF (audio) frequencies. Really my only requirements at this point are that it must be able to detect weak signals, i.e., sensitivity lower than -100 dBm, and it should be relatively inexpensive (< $500) - anything else is negotiable, including data rates. I'm having a hard time finding such a device that's not a homemade Arduino/Pi project with questionable sensitivity (e.g.