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Hallicrafters Dd1 Communication Receiver Instructions

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    Page 1 DD 1 INSTRUCTION BOOKLET CONTENTS PAGE 1 Discussion of Diversity Action 2 Antenna Recommendations 3 4 5 Operating Suggestions 6 7 8 9 Rejecter Theory and Operation 10 11 12 Four Curves on Rejecter Operation 13 I.F. Selectivity Curve, Sensitivity Curve, S units, M/V input curve. 14 Image ratios curve 15 A.V.C. characteristics curve, Audio Fidelity Curve, Overall Fidelity Curve 16 Functional Schematic of Receive DISCUSSION OF DIVERSITY ACTION The advantages to be gained from...
    Page 2 over paths differing in direction and length. Additionally, these waves upon reaching the receiver are of varying amplitude and phase. Fortunately for our solution to the problem of fading, a signal does not fade identically in two antenna locations at the same instant - even when the two antennas are spaced a relatively small distance apart, or when they are near to each other and in different planes of polarization. What is happening is that the phase angle between waves arriving over varying...
    Page 3 greatly minimized. The reason for this is clear when we understand that the receiver in control at any instant is the one which is delivering the greatest signal to the amplifier. The Hallicrafters Dual Diversity receiver, model DD1 differs from the usual commercial installation in that instead of using separately tuned receivers with individual high frequency oscillators, a common oscillator is used which feeds the first detectors of each of the two receivers. This eliminates the expensive...
    Page 4 wave length apart. Suffice to say, regardless of the type of antenna system you should choose to use, diversity action will be better when the two antennas are separated by as great a distance as possible. At this point it might be well to bear in mind that no one aerial, regardless of type, will work at peak efficiency throughout the tuning range of the DD1 receiver. The most practical antenna system for general coverage reception will be that consisting of two inverted L antennas approximately...
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