• Phantom Power
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    Phantom power specifications are well standardized under IEC 61938 and DIN 45 596. Acceptable voltages and current supply capabilities are well defined. Positive phantom voltage is found on the balanced microphone output terminals (pins 2 and 3 of an XLR connector) with the ground return on the shield. There is no such standard for the…

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  • ST-TC1 Telco Line Simulator
    ST-TC1 Telco Line Simulator
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    The ST-TC1 is a device that simulates a telephone company (telco) line for connection to a telephone switching unit (KSU). The ST-TC1 becomes the provider of an inbound line to your switch, so when any of your instruments pick up the line provided by the ST-TC1, a contact closure is provided and bi-directional audio is…

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  • Using Phantom-Powered (condenser) Microphones With RDL Products
    Using Phantom-Powered (condenser) Microphones With RDL Products
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    Phantom-powered (condenser) microphones can be used with the STM products. Each STM module has two terminals that enable phantom power to be applied. Phantom power can be provided using the same RDL power supply that powers the STM module. The FP-MP1 Ultra Low Noise Mic Preamp has switch-selectable phantom for mics operating from 12 to…

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  • Connecting Unbalanced Audio To Or From An RDL Product
    Connecting Unbalanced Audio To Or From An RDL Product
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    For most of our products the audio signal input and output wire is connected to the input or output positive (+) terminal. The audio return shield is connected to signal ground. The unused negative (-) input terminal is jumpered to signal ground. The unused negative (-) output terminal has no connection or may be used…

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  • dB Defined
    dB Defined
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    A decibel (dB) is a ratio unit for expressing signal amplitudes. If the amplitudes are expressed in voltage: dB=20 log (V1/V2). If the amplitudes are expressed in power: dB=10 log (P1/P2). In digital audio systems, decibels are often expressed in dBFS, the voltage value below the value produced by a full scale digital audio signal….

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