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The Model 3 103A-4 is a variable band-pass Filter with a low cutoff frequency range adjustable from 10Hz to 1MHz and a high cutoff range adjustable from 30Hz to 3MHz . The pass-band gain is unity (OdB), with attenuation rate of 18dB per octave outside the passband, and a maximum attenuation of 80 dB. Maximum input signal amplitude is 3 volts rms and output hum and noise is less than 100 microvolts.

OPERATING AND MAINTENANCE MANUAL 1.0 GENERAL DESCRIPTION ... 1 1.1 INTRODUCTION ... 1 1.2 SPECIFICATIONS. ... 1 1.3 TERMINALS ... .2 1.4 FRONT PANEL CONTROLS ... 2 1.5 POWER REQUIREMENTS ... 2 1.6 DIMENSIONS AND WEIGHTS ... 2 1.7 FILTER CHARACTERISTICS ... 2 2.0 OPERATION ... 5 2.1 INTRODUCTION ... 5 2.2 TERMINALS ... 5 2.3 FRONT PANEL CONTROLS ... 5 2.4 LINE VOLTAGE AND FUSES. . ... 5 2.5 OPERATION ... 5 3.0 CIRCUIT DESCRIPTION ... 7 3.1 INTRODUCTION ... 7 3.2 CIRCUIT DESCRIPTION ... 7 4.0 MAINTENANCE. ... 9 4.1 INTRODUCTION ... 9 4.2 POWER SUPPLY ... 9 4.3 SIGNAL TRACING PROCEDURE ... 10 4.4 TUNING CIRCUITS ... 11 5.0 CALIBRATION AND ADJUSTMENT ... 13 5.1 INTRODUCTION ... 13 5.2 SPECIFICATIONS, ... 13 5.3 TEST EQUIPMENT REQUIRED ... 14 5.4 POWER SUPPLIES. ... 14 5.5 CALIBRATION PROCEDURE ... 14 6.0 PARTS LIST, SCHEMATIC AND LAYOUT ... 21