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15
Caution: Use only microphone and speaker accessories that do
not share a common ground for the speaker and the microphone.
Doing otherwise might damage the transceiver.
Note: Inserting a headset’s plug automatically disconnects the in-
ternal speaker.
You can also connect an optional mono earphone to the SPK
jack. This lets you use the transceiver’s push-to-talk button to
transmit as usual. Your local RadioShack store carries a wide se-
lection of suitable communications headsets, earphones, and
separate components.
The following schematic diagram shows the typical wiring for a
suitable external mic and speaker.
MIC Plug
External Speaker
–
+
Barrel
Tip
Tip
Barrel
PTT
22k
Ω
Ω
Ω
Ω
External Microphone
–
+
Speaker Plug
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