Acesonic PK-6000 - Manual (Page 33)

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FM Transmission Band
Click on “Band” (or “Freq” in the latest PK-6000 version) for transmission band
adjustment. Note: Without headsets, the PK-6000 will still emit FM station signals but
signal strength will be weak. Plug in the earphones and they will act as an antenna to
maximize the transmission strength.
Figure 18