DATA SHEET MODEL 444D s" ® 282 CHARTRES AVENUE u EVANS TON, ILLINOIS 80202-3688 U.8.A. THE SOUND GE THE PROFESSIONALS” WORLDWIDE MICROPHONES AND ELECTRONIC COMPONENTS CONTROLLED MAGNETIC® FIXED STATION MICROPHONE GENERAL The Shire Model 444D is a dual-impedance CONTROLLED MAGNETIC® fixed station microphone with a frequency response tailored for optimum speech intelligibility.
Output Level {at 1,000 Hz) IMPEDANCE Low High Open Circuit Voltage . ~11.0 dBV/100ubar” {33 mV) {282 mv} ~69.5 dBY/ isbar™ ~51.0 dBVrubar™ 0.33mv) (282mV) Power Level ~48.
RED lead to the switching terminal; connect the BLACK lead to the ground terminal along with the SHIELD. Some transmitters close an isolated switching circuit 1o key the transmitter. For these units, connect the RED idea to one switching termini; connect the BLACK lead to the other switching terminal. SWITCHING This microphone has two slide switches on the underside of the base to select high or low impedance and Dermal {push-to-talk} or YOX {voice-operated) keying of a transmitter.
