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.
Filters: Crystals, LC, Mechanical, SAW, etc.
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*I thought this was an interesting look at filters and crystals. And even
mechanical filters. Remember: Those little SAW containers became the
lapel pi...
20 hours ago
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