Solid State Shortwave Receivers For Beginners - The Listeners Guide

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Although every care is taken with the preparation of this book, the publishers or author will not be responsible in any way for any errors that might occur. © 1976 BERNARDS (Publishers) LTD I.S.B.N. 0 900162 62 7 First Published October 1976 Printed and Manufactured in Great Britain by C. Nicholis & Co. Ltd.
CONTENTS Page CHAPTER 1 Frequency Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Propagation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Broadcast Bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Aerials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 CHAPTER 2- Ultra Simple Receivers Crystal Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Practical Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Coil Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Using the Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Regenerative Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Increased Selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Transistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Using the Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Bandspread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Overloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Construction Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 CHAPTER 3 - General Purpose Receivers Regenerative F.E.T. Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Using the Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Reflexive Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Infinite Impedance Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 D.G. MOSFET Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Detector and A.F. Stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 MOSFET Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 CMOS Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Single Band Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 CHAPTER 4 - Portable Receivers Portable Reflex Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Using the Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Louspeaker Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 F.E.T. Portable Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Page 1 and 2: Solid State Short Wave Receivers Fo
Page 3: SOLID STATE SHORT WAVE RECEIVERS FO
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 and 14: e. A length of wire is connected to
Page 15: Crystal Set CHAPTER 2 Ultra Simple
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
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CHAPTER 4 Portable Receivers One mi
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Normally the telescopic aerial shou
Page 70 and 71:
Components List for Fig.26 Resistor
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A.M. Signal It will be helpful to f
Page 74 and 75:
As should be apparent by now, if th
Page 76 and 77:
Components List for Fig.29 Resistor
Page 78 and 79:
the mains earth (regardless of whet
Page 80 and 81:
Blank page 80
Page 82 and 83:
Components List for Fig.30 R1 3.3k
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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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