Solid State Shortwave Receivers For Beginners - The Listeners Guide

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SPECIAL NOTES FOR OVERSEAS READERS 1. If you should experience any difficulty in obtaining “DENCO” coils locally, then these can always be ordered direct from the manufacturers whose address is shown below:- DENCO (Clacton) LTD 355-9 Old Road Clacton-on-Sea Essex. C015 3RH England. Tel.: Clacton 22807 2. To help our overseas readers the following list of possible equivalents is shown below:- BC107 AM251, BC147-167-207-317, MPS6566, SK3020-3122, ZTX107, TT107, CV9780, RS276-2009. BC109 AM253, BC149-169-209-319, MPS6521, SK3020, ZTX109, TT109, CV10769-10806, RS276-2009. BC109B BC149B-169B-173B-184B-209C-239B, G13711, MPS6521-6571, SK3020, 40397, 2SC458, 2N5126, RS276-2009. BC109C BC149C-169C-173C-184C-209C-239C, Gl3711, MPS6521-6571, SK3122, 40450, 2N5132, RS276-2009. BF115 BF117-122-173-184-194-224-225-237, SE1001-5056, SK3019-3122, 40239, 2SC454, 2N915-2952-3693, CV10243, RS276-2009. CD4001AE MC14001, MM4601-5601. OA90 AA112-116-121-123-137-138-143-160, OA70-160 SD60, SFD104, 1N60-618, RS276-1101/1135 OA91 AA117-118-132-144, OA81-95-161, SD38, SFD108, 1N38-55-63-617, 1S33, RS276-1136. 2N3819 E304, SK3118, CV10684. 3N140 40673. Remember that although equivalent semiconductors have similar electrical properties, physical dimensions and connections may be different and this must be borne in mind if space is tight and for mounting details. Remember polarities if replacing PNP with NPN types and vice-versa. If in doubt always be advised by your local dealer for suitable equivalent semiconductors. 92
BERNARDS No 222 Solid State Short Wave Receivers For Beginners + There is a strange fascination in listening to a broadcast which has been transmitted from a station that may be many thousands of miles away across the other side of the world. This has helped to make short wave listening one of the most popular and interesting branches of electronics and for this reason, is an excellent way of capturing the interest of a beginner. In fact, very many enthusiasts and ‘hams’ have been introduced to the hobby in this way. + In this book, Mr. R. A. Penfold, who is a very experienced author and has regularly written for many of the popular electronic monthly magazines, has designed and developed several modern solid state short wave receiver circuits that will give a fairly high level of performance, despite the fact that they use only relatively few and inexpensive components. BERNARDS (Publishers) LTD The Grampians Shepherds Bush Road London W6 7NF England 94
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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
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to have on. connection earthed. In
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It is very worthwhile experimenting
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layer, acts as the dielectric of th
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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 82 and 83: Components List for Fig.30 R1 3.3k
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: prevent the oscillator from operati
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Solid State Shortwave Receivers For Beginners - The Listeners Guide

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