Yet another receive loop is born.
The construction is similar to the first 500 kHz loop, i.e. cardboard box loop, but made with Litz wire and with only 6 turns.
The calculation of resonance frequency found here indicates a frequency range covering the whole of the 160m and 80m band, and this looks like what I have.
The coupling is made with a further full loop, and it looks like that creates a too hard coupling to the antenna (not really unexpected), making the antenna rather broadband.
Later this week some experimentation on the coupling loop size is in the planning.
Can you ID this Receiver? Grayson Finds a Homebrew Receiver in Germany. From the GDR. Circuit? Schematic? Thermatrons? - *Grayson Evans KJ7UM (the author of Hollow State Design) was recently in Germany where he spotted this museum display of a homebrew receiver built in ...
3 hours ago
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