Solid State Shortwave Receivers For Beginners - The Listeners Guide

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Crystal Set CHAPTER 2 Ultra Simple Receivers A good starting point for anyone interested in building receivers is to build a crystal set. The main advantage of this type of set is its extreme simplicity. Another very important one is that they require no power supply and have no running costs. This tends to give crystal sets an added fascination over other types of receiver as it is actually the power of the received transmission that provides the energy that drives the diaphragm of the headphones or earpiece. It may seem impossible that the energy radiated from a transmitter some hundreds or even thousands of miles away can provide sufficient power to produce an acceptable volume at the transducer of the receiver, but indeed it can. Before considering a practical crystal set circuit it is a good idea to look at what the received signal is actually like. High frequency A.C. signals at the transmitter are radiated as a form of electro-magnetic signal which is usually termed radio waves. These travel out from the transmitter at the speed of light (186,000 miles per second) and when they reach a receiving aerial they generate minute electrical signals in that aerial. These signals are identical to the original high frequency A.C. signal produced at the transmitter, but are of course at a very much lower power level. 15
Page 1 and 2: Solid State Short Wave Receivers Fo
Page 3 and 4: SOLID STATE SHORT WAVE RECEIVERS FO
Page 5 and 6: CONTENTS Page CHAPTER 1 Frequency S
Page 7 and 8: CHAPTER 1 There is a strange fascin
Page 9 and 10: Propagation The reasons for the ama
Page 11 and 12: 41 Metres 7.1 to 7.3 MHZ 31 Metres
Page 13: e. A length of wire is connected to
Page 18 and 19: Components List for Fig.6 T1 Denco
Page 20: To those unfamiliar with this metho
Page 23 and 24: The completed chassis and panel are
Page 25 and 26: crystal set is not very high. This
Page 27: ted it would look something like th
Page 30 and 31: 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 53 and 54: Components List for Fig.20 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
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Normally the telescopic aerial shou
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Components List for Fig.26 Resistor
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A.M. Signal It will be helpful to f
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As should be apparent by now, if th
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Components List for Fig.29 Resistor
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the mains earth (regardless of whet
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Components List for Fig.30 R1 3.3k
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Components List for Fig.32 R1 3.3k
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Apart from increasing the sensitivi
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Components List for Fig.36 R1 390 o
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prevent the oscillator from operati
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BERNARDS No 222 Solid State Short W
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Solid State Shortwave Receivers For Beginners - The Listeners Guide

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