M497B — Dual Master Module

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Noise: -108 dBm EIN from 20 Hz to 20 kHz.

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M497B DUAL MASTER_MODULE RIGHT Channe and MONO Output . The right channel the M497B operates manner similar the eft channel as described above_ . For the MONO output, both channels are combined and appear pins Im The signal level this output such that, when connected the summing input second M497B , will produce an output dBu_ with the left right channel the first unit operating +8 dBu (Re 600 ohms) .

. ' Power_Supp Decoupling An active power supply decoupling network consisting through 06 provides iso ation between the module and the -25 vol- supply rails Transistors 03 and 06 monitor the supply current. the event excessive power SUPP ema nds, such as from component failure amplifier OV erdrive, the current flowing through and 04 will be limited . s .

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M497B DUAL MASTER MODULE Gain: dB +/-0.5 dB nominal +2, dB provided. trim range Frequency Response +0/-1 dB from Hz kHz (tailored frequency response) dB below dBu nominal output level (20 Hz 20 kHz) = Noise: Harmonic Distortion Less than 0 .259% THD , from Hz 20 kHz +27 dBm output less _ Less than 0.1% at kHz at +27 dBm output

Source Impedances: Summing: External Oo0 ohms, balanced 600 onms ma imum, balanced

Input Impedances Summ ing: External Less than ohms _ 30 , 000 ohms Input Level: External dBm nominal +16 dBm maximum. Output Impedances: Program: Mono: 150 ohms; balanced 36,000 ohms, balanced Load Impedances Program: Mono: 600 ohms, balanced Summing, less than ohms, balanced 1-1

M497B DUAL MASTER_MODULE The M4978 accommod- tes (Wo separate signal channels. designed receive the mixed feeds from the left and right mixer buses console The [wo signals are independently processed and amplified standard line levels The outputs the M4978 supply the main Program outputs the console system _ Both channels operate similar manner The following description refers specifically the LEFT channel.

. Input The signal originating from the externa mixing network enters the module pins 1/A and applied the summing current nodes and U2 through u3_ with their associated components_ provide an actively ba anced input as wel as balanced output. The output operates nominal level dBu and appears pins 6/F Insert balanced INSERT point provided between pins 6/F and permi tting the insertion an external equalizer filter com- pressor either using an M49g insert switcher by direct wiring_ Level_Adjustment From the INSERT point; the Signal returned the module pins 8/ J and fed the 8-109C output amplifier via an ttenuator network R42 level trim potentiometer permitting adjustment the module output level from +10 dBu with reference the nominal level dBu.

small hole the module front panel allows access the trim controi Outeut The 8-109C output amplifier operates with gain dB _ recovers the loss the input network and provides additional gain produce nominal Iine level dBu into 600 ohms the output the module _ 150 ohm resistive dividing network having loss dB (when operated into 600 ohm load) inserted between the 8-109C and the three module outputs at pins 12/N, 13/P and 14/R The amplifier outputs are designed normally operate into bridging load (Sk ohms) The ampifier capable delivering maximum output level +27 dBm into 600 ohms any one its outputs (not all loaded simultaneously ) _ 2-1

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