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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
External Microphone
–
+
Speaker-
Plug
19-1104rc.fm Page 15 Friday, August 27, 1999 8:31 AM