User manual ELECTRO-VOICE CO2 SERVICE DATA

[. . . ] The mute button can be configured for push-on / push-off, push-to-talk, or push-to-mute function. Switch programming is easily accomplished without disassembling the microphone. A switch on the bottom quickly converts the PC Desktop to automatic mixer mode. In this mode, audio is always on. Applications: The PolarChoice Desktop is acoustically designed for high-quality sound reinforcement and broadcast applications. [. . . ] Applications requiring speaking close to the microphone at podiums, lecterns, or pulpits normally require a windscreen (included) to control breath noise and P-popping or, in some cases, wind noise from circulating air. PolarChoice PC Desktop-5/ PC Desktop-12/ PC Desktop-18 Microphones Microphone Setup: Cardioid Supercardioid Hypercardioid Omnidirectional Figure 1: PC Desktop Controls Figure 2: Bottom View Figure 3: PC Board Detail Refer to Figure 1 for the following switch function descriptionsSwitch A - Select High-Pass switch position. Start with this switch set to the left (flat response). If the mic is in a location where low frequency rumble or wind noise is a encountered, moving this switch to the right will help by reducing low frequency sensitivity. High Pass ( ): minimum 5 dB reduction in sensitivity at 100 Hz. Switch B - Select preferred polar pattern. The cardioid polar pattern works well for most installations. If feedback from a sound system occurs, switching to the supercardioid or hypercardioid pattern will usually allow increased mic gain before feedback. The omnidirectional pattern is best suited for situations where there is no sound reinforcement system present, such as for recording. Switch C and D - Controls action of push-button switch on the top of the PC Desktop microphone. Momentary modes - When switch C is set to the left, the push-button (mute) switch action is momentary. In addition, If switch D is in the left hand position, the mic will be in push-to-mute mode. The base will have a 10-foot integral 5-conductor (2-conductor shielded) cable terminated in a 3-pin XLRM connector. The microphone shall have four selectable polar patterns: omnidirectional, cardioid, supercardioid, and hypercardioid. The mic will use a pair of back-electret condenser elements with a frequency response of 50 Hz to 20 kHz. The microphone shall have a nominal, balanced output impedance of 200 ohms. The microphone will have a switchable high-pass filter to roll off low frequencies. The microphone shall have an output level of 5. 6 mV/Pascal and outputs shall not be appreciably affected by the following temperature and humidity extremes: -29° to 74° C (-20° to 165°F) when the relative humidity is 0-50%; -29° to 57°C (-20° to 135°F) when the relative humidity is 0-95%. Dimensions shall be 231 mm (9. 1 in. ) long (PC Desktop-5), 373 mm (14. 7 in. ) long (PC Desktop-12), and 526 mm (20. 7 in. ) long (PC Desktop-18) with a maximum head diameter of 14. 6 mm (0. 58 in). The PC Desktop-5 microphone shall include a 175 mm (6. 9 in. ) gooseneck. The PC Desktop-12 microphone shall include a 318 mm (12. 5 in. ) gooseneck. The PC Desktop-18 microphone shall include a 470 mm (18. 5 in. ) gooseneck. The gooseneck will be attached to a base that has a top mounted push-button and a status LED that lights when audio is active. [. . . ] The microphone will be capable of operation with automatic mixers by means of a configuration switch located on the bottom of the microphone. When the microphone is in automatic mixer mode, normal LED and top push button functions are disabled. In automatic mixer mode, audio will always be on, the top push button will only change the logic level on the microphone's white wire, and a logic low level on the microphone's orange wire will cause the LED to illuminate. All controls except for the push button shall be accessible from the bottom of the microphone base. [. . . ]