TheRadioBoard

Say I build a full-wavelength 15m quad loop installed permanently on the wall of my balcony. Then say that later I build a small transmitting loop for comparison purposes, for use on that same balcony at the same frequency. Will there be unwanted coupling between the two antennas? And, if so, what can I do to avoid it? Would I have to "detune" the quad loop somehow when I operate the small transmitting loop (magnetic loop)?

Yes, there will be coupling. This is the principle used in many advanced crystal sets, where separate tuned circuits are air-coupled. You could orient one loop at 90 degrees to the other, or detune it. Simply shorting the tuning cap would probably work.

73,

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Well the quad loop (wire) will have no tuning mechanism, just a matching coax segment or maybe some sort of toroidal transformer, so it's not immediately clear how to detune the quad when I want to try the magloop. Maybe I could just clip a random capacitor across the quad loop to detune it.