Detail of plug-in tuning coil assemby D for the <a href="https://en.wikipedia.org/wiki/National_HRO" class="extiw" title="w:National HRO">National HRO-60</a> receiver - this is the 80m coil set, covering 1.7-4.0 MHz (general coverage) with 3.5-4.0 MHz bandspread.
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