Solid State Shortwave Receivers For Beginners - The Listeners Guide

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Components List for Fig.30 R1 3.3k R2 680 ohms C1 47nf plastic foil. C2 22pf plastic foil. L1 10mH. (Repanco CH4). Tr1 2N3819. S1 S.P.S.T. toggle. Hardware. spectrum. This is because the input and output of a common gate stage are in phase, and any feedback due to stray circuit capacitances is positive, and tends to inciease gain rather than diminish it. The circuit of Fig.32 is basically the same as that of Fig.30, except that it has been modified to use the aerial input coupling coil of the receiver as its drain load. It will only work with receivers that use an aerial coupling coil (which most do). This circuit is of the positive earth type, but as it uses its own power source, and is isolated from the receiver by its input transformer, it can be used with both positive and negative earth receivers. In fact any of the R.F. amplifiers described here are suitable for use with either type of receiver. The circuit of Fig.33 is the grounded base version of Fig.32. Although one might think that. the tighter coupling between the - receiver that is achieved with the circuits of Figs.32 and 33 would give these a higher gain than the previbus two circuits, in practice this would not appear to be the case. Their gain would seem to be fractionally lower. 82
Components List for Fig.31 R1 680 ohms C1 22pf plastic foil. Tr1 2N3819. L1 10mH. (Repanco CH4). S1 S.P.S.T. toggle. Hardware. 83
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Solid State Short Wave Receivers Fo
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SOLID STATE SHORT WAVE RECEIVERS FO
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CONTENTS Page CHAPTER 1 Frequency S
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CHAPTER 1 There is a strange fascin
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Propagation The reasons for the ama
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41 Metres 7.1 to 7.3 MHZ 31 Metres
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e. A length of wire is connected to
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Crystal Set CHAPTER 2 Ultra Simple
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Components List for Fig.6 T1 Denco
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To those unfamiliar with this metho
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The completed chassis and panel are
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crystal set is not very high. This
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ted it would look something like th
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eceivers it does have too low a val
Page 32: to have on. connection earthed. In
Page 35 and 36: It is very worthwhile experimenting
Page 37 and 38: layer, acts as the dielectric of th
Page 39 and 40: level that reaches the detector of
Page 41: CHAPTER 3 General Purpose Receivers
Page 44 and 45: The output of Tr1 is developed acro
Page 47 and 48: Components List for Fig. 18 Resisto
Page 50 and 51: Components List for Fig.19 Resistor
Page 55 and 56: A.F. noise from Tr2 from reaching s
Page 57: The gain of the I.C. is fixed at ap
Page 60: Like MOSFETS, CMOS I.C.s can be dam
Page 63: CHAPTER 4 Portable Receivers One mi
Page 66: Normally the telescopic aerial shou
Page 72 and 73: A.M. Signal It will be helpful to f
Page 74 and 75: As should be apparent by now, if th
Page 78 and 79: the mains earth (regardless of whet
Page 80 and 81: Blank page 80
Page 84 and 85: Components List for Fig.32 R1 3.3k
Page 86 and 87: Apart from increasing the sensitivi
Page 89 and 90: Components List for Fig.36 R1 390 o
Page 91 and 92: prevent the oscillator from operati
Page 93: BERNARDS No 222 Solid State Short W
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Solid State Shortwave Receivers For Beginners - The Listeners Guide

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