6.9.5 Wiring for dynamic microphones
Special attention is required for the wiring for dynamic microphones. Because of the required high
gain any mistake on the ground wiring leads to interferences and feed backs.
The basic rules are:
Never connect the power current grounds with the microphone ground.
• The cleanest GND is the case of the radio.
• Connect the battery-GND to the case and pin 1 and the microphone GND to the pin 9 only
(standard allocation).
6.9.6 Connection support ST1 mating connector
In order to get clean cable shields connections, and to avoid ground loops an adapter board as shown
is recommended.
The adapter board is placed between the connector pin rows and soldered to GND pins 1 and frame.
Pin 9 (microphone-GND) has its dedicated connections for shielding.
Figure 9: KRT2 connection support layout 1
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