inductive coupling


lrdheat
 

I notice that both my digital SANGEAN PR-D5 and my analog SONY ICF-S5W and EX5 all can be tuned to a given frequency, and then used to boost a signal significantly on an ultralight tuned to the same frequency. My question is, why do the analogs work as a booster even when off while the digital works as a booster only when turned on?

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