Pihernz Superstar 3900 - Rear Panel and Microphone Details; Rear Panel Connectors; Microphone Layout

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13 SWR calibration control.
14 Backlight setting control.
15 PA/FM/AM/USB/LSB selection control.
16 SSB frequency coarse setting control.
17 SSB frequency fine setting control.
18 Channel selector control and working band selection (multistandard mode).
>> Rear panel:
No.
Function
19 External speaker jack.
20 PC programming port.
21 External speaker connector.
22 Antenna connector.
23 DC power connector.
>> Microphone: