7412533105

than all t>revious classes.

learn codę faster, easier than ever bełore-

RIDER ^50UND-n-^5lGHY CODĘ COURSE

by Lewis Robins A Reed Harris

I^,rlrr* tubjert to cłiangr Mitliout notlce

537603 in each of the two chassis ver-sions), will prolong tubę life. Check the value of the plate-load resistor in the first triode (connected to pin 6). The original component. R»u. was a 1.2-megohm unit. See Fig. 1. This should be changed to Rnu-u 820.000 ohms, '/z watt. The resistor may be found by guiding on coordinates E-7 on the location chart in the service data. The cathode resistor for the second triode of V,. connected to pin 9. should also be checked. The original part.

,. was 150 ohms. See Fig. 1. It should be changed to #«*-». 270 ohms. 2 watt. It may be found on coordinates F-8 on the location chart for identify-ing components in the manufacturer's service literaturę.

OLYMPIC: AUDIO HUM

On some radio-phono combinations using audio amplifier chassis SA 812 and SA 813, there may be a tendency for buzz or hum to develop. This symp

tom can generally be remedied by al-tering the series-filament wiring of the audio-amplificr tubes. As shown in Fig. 2 (old wiring in part A, new wiring in part B), only three tubes are involved in the change. Furthermore. only two connections need be opened and interchanged. The wire from the selenium rectificr to pin 3 of one 50C5 flead 1) is disconnected at the tubę pin. The wire from pin 5 of the 12AX7 (lead 2) to pin 4 of the other 50C5 is also disconnected at the latter point. These two are then reconnected. each going to the tubę pin formerly occu-pied by the other.

TRAY-LER: DEAD RECEIYER

When there is no sound or raster on TV receivers whose model numbers be-gin with 721, or which are in the 1700 series. an open tubę filament is not the only possibility. Checks should be madę of the Surgistors and plug-in type fuse resistors used in these sets. If the re-ceiver is dead and no tubes are lit. Sur-gistor F• should be checked in addi-tion to tubes for a possible open con-dition. If there is no sound and no raster but the smali tubes are glowing, plug-in type resistor fuses F.._u F». or F,*, depending on the chassis used. should be investigated. This condition may also be due to a defective low-voltage rectifier, 5U4GB.    -g§-

Oełober, 1959

BASIC AUDIO by Norman //. Cronhnrtt. The Rider "picture-book" upproach han marle many lechnieal aubjecta understamlable to many hunil-red* of thousanda of people. Now. everythinR about aound and audio reproduction is madę crysial-elear. If hi-fi is your interetl — or if you work with tape recorders—or the broad aubjeet of aound reproduction. intereata you,—or if you assemble your hi-fi equipment or buy a complete '"packaKe'*—you must rcad Basic audio.

If you already own sound reproducinK eouip* ment—thia "picture-book" course will give you an all-around buckground on all the important details of sound reproduction. It w-ill enable you to Ket most from your eouipment.

You can learn easily. rapidly at very Iow- cost. You build your knowledRC step-by-step. There's one idea and one specially prepared illustration per page. Morę than 400 illustrations for mo::l-mum understanding.

Keyond a knowledRe of eleclricity at the basie level. no pievioii» electronic experience is needed to Ret the masimum from thia course. Whatever electronics Circuit theory is reouired is provided.

This Rider "picture-book" audio course is com-pletely different from anythinR that has even been presented. We Ruarantee your satisfaction.

#201, 3 vols.. soft covers. 38-70 per set. LOW-FRIQU(NCY AMPUFUR SYSTEMS (Yolume 31 in the Klectronic Technology Series) ediled by Alcx. Sehure.    A    companion volume to

I.OW-KRKQUKNCY AMPI.IKIF.RS. this text ex-tends the study into the field of low-freouency amplifier Systems IncludinR the d-c amplifier. #166-31. SI.80.

SHORTWAYE PROPAGATION by Stanley Uin-woli (Radio Frcyuency and Fropagation Mgr.— Radio Free Kumpel. Of special interest to those concerned with radio Communications, this text providex a modern, up-to-the-minute analyAis of shortwave propuiration. lonosphere characteris-tics are discussed together with the naturę of radio wa\es. The book then carries the reader into the sky wave. measuring the ionosphere. iono* spheric variations, the sunspol cycle. and ahnor-mai phenomenon. Sky wave propagation* are covered and the preparation of MUF curves nre discussed. There is considerable materiał of in-tereat to the amateur radio operator. #231. S3.90.

’ I    'III

"I    '

BASICS OF MISSILE GUIDANCE A SPACE TECH-NIOUES by Marvin Hobbs. You can learn and easily understand the fundamenta)* of the important electronic areas that will contribute to the conquesl of space with this two-vo)ume 'picture-book’ course. Volume 1 covers elements of contro) and guidance — radio and radar command links: guide beams. doppler and homing methods: fundamenta!* of gyroscopic*: inertial and celes-tial navigation: Computer applications: actuators and their related components. Volume 2 covers radio telemetry and space technioues: testing and telemetering; space cxploration by optics and electronics; satellite theory and practice: monitoring, tracking; earth satellite applications: space navi-galion. #229, 2 vo)s.. soft covers. $7.80; #229-H. 2 volx. in one cloth binding. $9.00.

PRINCIPLES OF TRANSISTOR CIRCUITS by S. W.

Amos. H.Sc. A remarkably lucid presentation of the princinles underlying the application of tran-sistors. The book deals with the fundamental theory of the transistor.but emphasis is ondesign of a wide variety of circuiU. #241. $3.90

•    applies RElNrosCEP LKASninc—a psychological principle proved succesaful by the Armed Forces.

•    uses LP records to teach you to hear signal pat-tern correctly and identify it— how to tranamit.

•    uses Identification cards to teach you the correct letter Associated with each signal pattern.

•    uses instruction book to speed your progress. ... plus an imaginary instruetor (in complete and novice courses) provides correct answers to speed co<le learning. Many people have Irarned to rcccive 5 worda per minutr within 914 hours. Lliminates codę plalcau barrirr!

Scores Kation-widc Sueecssrs — Frank Alessi, Jr.. 9-year-old achieves generał class license using Sound-N-Sight Codę Course.

From the Monmouth Messape. April 30. I9S9. ‘Fort Monmouth — Student ofTicers of the Radio Officer MOC Course, Section 3210. have madę ex ceptional progress mastering Morse Codę in-structions utiliiing the Rider 'Sound-N-Sight’ method • .. studenta have progressed much faster

R-l-C COMPONENTS HANDBOOK by V*v\d Mor*. An extrcmely cofnprehensive covfriRf of the fun-damental components used in radio and electronic equipment is provided for the beginner at well as tjie technician. The lext leaves nothing to the imagination. It start* and finishes with the prac-tical approach to the functioninff and utility of electronic components without which no electronic de\*ice could function. Most component failures can be avoided by properly utilizing basie princi-ples. Resistors, capacitom. inductors. and trans-fornters-are covered. Voltage. temperaturę, re-sistance. current. and numerous other electrical characteristics and ratłngs are explained as well as coding technioues and physical details.

#227. $3.50.

R-F AMPUFIERS (Volume 27 in the Hadronie

Technology Series) ediled by Alex. Sehure. Ph.D. An excellent discussion of the operation of ampli-fiera in the r-f portion of the radio frecjuency spectrum. The design and theory of operation of a wide rangę of r-f vo)tage and power amplifier* are covered. #166-27. $2.40.

(FFECTS OF NUCLEAR RADIATION ON MEN AND MATERIALS by T. C. Helvey (Director of Bio-physies and Astrobiolopy Branek. Radiation. Inc.ł Nuclear power for propulsion of military and civilian vehiclea has become a reallty. However, the application of nuclear energy in mobile units ha* presented a jrreat many unexpected and un-heard of technological and biologica) problems. This book discusses the basie naturę of nuelear radiation—alpha. beta and gamma rays—and their physiochemica) and biochemical efTects. Radiation efTects on man. deals with details of ioniziug radiation. dose tolerance. genetic effects of radiation, and air ioniration and its biological efTects.

In covering radiation efTects on materials, the author discusses the efTects of nuclear particie* on materials such as textiles. adhesives. plastics. fuels. and łnorganic materiał* such as metali, cera mi cs and glasa.

A feature of this book is a chapter on shield configuration covering transparent shielding materials. partial body shielding. and special shields for gamma and neutron bombardment. #243. $1.80.

i • * • i •

• i

4 FABULOUS 'PICTURE BOOK' COURSES You can learn sny electronic sbbject easily, rapidly at Iow cost with these 'picture-book* courses. Important areas of electronics are presented in simple down-to-earth language. There*s a specially prepared and selected illustration on each page-to support each idea.

BASIC ELECTRICITY by Van Valkenburph. Nooper A Neville, liu\, #169, soft cover. 5 vo)s.. $10.00: #169H. all 5 vols. in single cloth binding. $11.60.

BASIC ELECTRONICS by Van Valkenburph. Noooer A Neeille, /nc.. #170. soft cover. 5 vols„ $10.00: #170H. all S vo!s. in single cloth binding. $11.60.

BASIC TELEYISION by Alezander Sehure. Ph.D.. #198, 5 vols.« soft cover_# $10.00: #198H. all 5 vols. in single cloth binding. $11.60.

BASICS OF DIGITAL COMPUTIRS by John S. Murphy. #196. 3 vols., soft covcr, $7.60: #196H. all 3 vols. in single cloth binding. $8.60.

3 INDlYIDUAl (OUtSES - THEtE'S ONE FOR YOU

COMPLETE COLRSE (0-20 wordt per minutę)-Six 10" LP records (192 minutes of recordina, 46 recordings). 47cards, book. #REC- 020, S1S.9S. NOVICE COLRSE (0-8 words per minutę)—Three 10" LP records (96 minutes of recordłng, 28 recordings). 47 cards, book. #REC-0», $9.50.

AUYANCED COLRSE (9-20 words per minutę) — Three 10" LP records (96 minutes of recording, 28 recordings), book. #REC-920. St,9S.

Records prepared in collaboratlon wifJi the N Y Institute of Technolopy and mfd. by Deeca Records.

Other Rider books that add to amateur radio enjoyment are: Gettinr Started In Amateur Radio; Building The Amateur Radio Station: Radio Operator'* License Q Ł A Manuał (6th edition) How To Read EW-10 Scoematics

At your joblier or book storę.

or order direct.

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