• 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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  • Impedance Simplified
    Impedance Simplified
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    Impedance is the resistance of audio circuits to audio signals. Any audio input has an impedance, as does any audio output. Modern input stages are typically high impedance, often 10 kOhms or higher. These inputs accept the input signal without demanding power from the prior equipment output. For accurate amplification, it is generally accepted that…

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