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1. and stick to it ive ness mean Student H W Moon of Aberdeen S Dak is one of severa who have put high prices on the course s value He writes Your course so far is worth far more than its cost to me I would not part with the training I already have for 1 000 It will make me that much more this winter There are plenty of fellows in this country who would like to make the cost of their training ten times over in less than one year Yes plenty of them but they wait and wish They don t realize it s action that counts nowadays If you want to know anything about the Spar ton set or what it means to be a Sparton dealer get in touch with Graduate Wilmoth Sales Man ager for the Sparks Withington Co Jackson Mich Wilmoth says that Sparton is going over big Training will tell Here s how Student W F McCool 2315 N Mon roe Spokane Washington is getting on in Radio Read his letter When I enrolled I was employed in a garage as a mechanic On the 1st of September I left the garage and since then I have spent all of my time with Radio In August I made 184 85 profit from my Ra dio work in spare time only I had my repair shop at my home Then I decided to open a Radio store On the first of October I received my franchise from Silver Marshall and also the first of six receivers To date I have sold 16 re Ceivers and also sold 7 out of the 9 used receivers that I took in as part payment Then I was ap point
2. the vacuum tube and photo electric cells to come into their own The vacuum tube and photo electric cell have thousands of applications in industry and science where they are awaiting introduction Their usefulness in Radio Talking Pic tures and Television has been granted but we have far to go before we take real advantage of their many properties and abilities The vacuum tube enables us to transmit electric current variations how ever minute or complex through any dis tance with or without wires and to amplify these variations to any desired intensity So far we have utilized this property in the transmission of speech and music both over wire lines and by radio The sensitive converter of sound waves the microphone permits us to change our sound wave variations into electric cur rent variations The vacuum tube does the rest Television Talking Pictures and the transmission of photographs over wire telephone lines require an instrument similar to the microphone called a photo electric cell This device converts varia tions in light waves into electric cur rents Many years of development work have been required to make a workable instrument which does for light waves what the microphone does for sound waves At the present time it seems as if the photo electric cell might prove useful for the same things that human eyes are used and many things that the eye cannot be used for In fact Radio tube specialist
3. A E S Note the Vice President in front row with his famous black hat and other prominent Radio men ad dressed the graduates A special sur prise feature was staged by the gradu ates in making the suggestion that an alumni association be formed They carried the idea out themselves elected their own officers and pledged them selves to work for the interests of N R I students and graduates everywhere This will go down in the history of edu Continued on page 15 WWW americanracdiohistorv com NATIONAL RADIO NEWS 10 ANNIVERSARY NUMBER Cash in on the farm market Too many farm homes are equipped with old out of date sets They need the new modern sets more than ever now A number of manufacturers are design ing sPecial equipment for the farmer and it wil pay N R I men in the rural sections to take advantage of the rich farm market now opening up qe By E A NICHOLS Vice President Radio Victor Corporation of America SELL THE FARMER ADIO means even more to the rural home than to the city home To the farmer radio spells a vital business service just as much as entertainment for leisure moments and recently broad casting stations have come to recognize the farm listener as an important part of their listening audience so that agri cultural programs have been developed to a remarkable degree The radio industry has not forgotten the rural home Radio engineers have turned to the
4. are doing their part in putting Radio over Editor WWW americanradiohistorv com
5. copper can of the condenser which is negative a low reading will be obtained If the test leads are then reversed the true reading will be obtained Often times when testing the circuit of the set a WWW americanradiohistorv com 13 NATIONAL RADIO NEWS ANNIVERSARY NUMBER aeg PUU ZZS EG ZE SIOPOJA AIA QUIZ JO urvisvpp n24 ANIJA 4 awe vj p IIJAJOS aqu peae 353 eq sdp 193ug 4nO0K JE datu nos Ava SUL SQof 9 asas Gn AJINY uo asn Joj Apuey uu savy 49pujg UB I9 IL OPYY 1no amp Uf aysed pur jno j enugu 2IALIS pue wesseyp snp mo a o HILMS FP 1 ye 7m DX Te P x LJ N NE NN MU KA Moana se 55955 Jum Oum pouce E UNIO n iti a LIAS NOLIINAOD OPLLIWO ENOL IFINMOP ISIML dC PILE LE WWW americanracdiohistorv com NATIONAL RADIO NEWS reading will be obtained and the service man may judge that part of the circuit defective whereas a reading is being obtained through the condenser Resistance Values Parts No Resistance Markings 63 108 50 000 Ohms Green 63 109 100 000 Ohms Red or Pink 63 110 400 Ohms Yellow 63 111 2 000 Ohms Black 63 112 4 000 Ohms Blue 63 113 250 000 Ohms White 63 121 100 000 Ohms Pink The voltage divider 63 105 is of 6000 ohms resistance tapped at 850 ohms from one end and 2800 ohms at the other leav ing 2350 ohms at the center section The ud tapped resistor 63 114 is 10 o
6. in struction that has been built up by experts that man gets knowledge and training that sticks with him It s not the soft soap stuff that goes into one ear and out the other That s why so many correspondence trained men are the big executives today Walk down the street and every one man out of six that you meet has at some time or is at the present taking a home study course Figures show that 53 of the college graduates in the United States take a correspondence course after they get their college degree For 15 years the National Radio Institute has been specializing in giving Dractical training to thousands of ambitious men who want to share Radio s big opportunities The success that the 6 000 graduates have met with the key jobs they are now holding in Radio proves that N R I training GETS RESULTS Those who now are members of our world wide training organization have stamped themselves as being serious minded practical men determined to succeed and they WILL succeed The world has learned the kind of stuff home study trained men are made of The man who can say that he got his training the same way that Geothals Chrysler McDonald Kellogg and thousands of others did he is in mighty fine company and has a right to be proud that he is home trained man E R HAAS Vice President and Director 3 NATIONAL RADIO NEWS Dr Lee De Forest Says The Radio Industry has assumed such tremen dous pro
7. methods of detection The circuit diagram of Models 52 53 522 532 is shown in the Figure 1 Models 54 and 542 use exactly the same diagram with the exception that there is a two point switch in the grid circuit of the first tube which disconnects the induc tance coil from the circuit and connects one side of the loop aerial to the grid of the first tube The other side of this loop is grounded to the chassis To Remove Chassis From Cabinets First remove the two lower screws in the escutcheon plate These secure the escutcheon plate to the chassis and if not removed before attempting to move the chassis damage to the escutcheon plate will result Second remove the four bolts running up through the cabinet shelf into the bot tom of the chassis Third make certain all wires fastened to binding posts are removed Also re move the multicable running from the power unit to the chassis This is done by loosening the nine screws on the con tact strip and slipping the terminal strip to the right Make certain the dial light bracket is slipped out of its holder so as to prevent damage The plug connec tions should be pulled from their sockets Fourth loosen the two hexagonal head set screws holding the coupling between the automatic tuner and the tuning con denser shaft NOTE Do not remove the large hexagonal head bolt that secures the large coupler to the condenser shaft The chassis may then be pulled out the rear
8. of the cabinet Hints on Servicing MERSHON FILTER CONDENSER The Mershon filter condenser is used in stead of the conventional tin foil and paper type This condenser is as near trouble proof as can be made In the event that a por tion of the electrolytic contents of the condenser is spilled or allowed to leak from the condenser no harm will result with respect to fabrics metals or wood finishes However a white spot will appear where the solution has been but this can be removed with a damp cloth If during the operation of the set a frying sound emanates from the con denser the cause is high line voltage and the fuse should be placed in the 120 volt position A line resistance should be used to reduce the A C supply if the fuse is already in the 120 volt position When testing the voltage divider 63 105 for continuity the Radio Trician should remember that unless the test leads are touched on the proper termi nals of the voltage divider a false read ing will result The reason for this is The Mershon condenser will pass cur rent in one direction If a voltmeter with a battery in series is used for test ing the voltage divider or Mershon con denser and the test lead running from the positive terminal of the voltmeter is touched to a point that connects with one of the terminals of the Mershon con denser and the test lead running from the negative terminal of the battery is touched to a point leading to the
9. requirements of the un electrified home eager to duplicate in that field what has been achieved for city and town radio enthusiasts They have evolved new and refined types of loud speakers capable of supplying ample volume and rich tone from a minimum input Because of the relative inefficiency of loud speakers in the past it has been necessary to employ more tubes with a larger current drain A small increase in drain means a con siderable decrease in battery life Hence battery sets of the past have not been very economical unless loud speaker vol ume and tone were lowered The recent development of the screen grid tube with an amplification factor several times that of the usual three element or standard battery tube has also been a step in the direction of the ideal battery set Indeed with a single screen grid tube replacing between two and three of the usual tubes for the radio frequency end and when also used as the detector replacing the first audio tube as well battery current has been reduced to new low levels These cur rent economies on the one hand com bined with the possibilities of greater volume and better tone through refined loud speaker design on the other have made possible a battery operated radio set about on a par with the average socket power radio set plus the advan tage of a noiseless background for tun ing distant stations which is so im portant for the listener who is a con siderab
10. RADIO NEWS Big Profits The picture below shows a fine custom set building job that netted Graduate F H Perau 771 Amherst St Buffalo N Y exactly 500 It is a splendid piece of craftsmanship Mr Perau writes that he has about two custom set jobs each month which goes to show there s good money for the technical man with a lit tle imagination and the desire to pick up the jobs E IS MIA Ma President Curtis Congratulates Graduates on Choice of Radio As A Life Work Continued from Page 9 cation as being the first alumni associa tion of graduates of a home study school ever founded Again the men of N R I lead the way The prestige that this alumni association will bring to N R I trained men will have a far reaching effect and be of great value to them Just as the Convention was closing the graduates presented Mr Smith with a beautiful loving cup as a token of their appreciation for the influence he has had upon their lives the friendly helpful spirit he has shown in helping them make good in Radio On this cup are engraved the names of each graduate at tending the Convention A picture of this big beautiful cup with President Smith is shown on the cover of this issue Vice WWW americanradiohistorv com NATIONAL RADIO NEWS 16 ANNIVERSARY NUMBER THE 100 000 WATT APPARATUS AT WGY Men who know say that we are enter ing an era of super power broadcasting It would seem so from the n
11. RESIDENT COLUMBIA BROADCASTING SYSTEM At no time during the past has the future looked so bright for the seeker of Radio knowledge as at present In the past Ra dio has come through vast revolutionary changes and the last fifteen years were really a period of prepara tion for the Radio in dustry Right now is the time that every able minded and amp ble bodied radio man begins to cash in on his Radio knowledge In the Radio servicing field in Radio Sound En ineering in Television there is a tremendous op portunity far greater than at any time during the past fifteen years At this moment there is a great scarcity in Radio service men and Radio Sound engineers and with the coming of Radio equipped automobiles during the next few months this scarcity will become more acute HUGO GERNSBACH EDITOR RADIO CRAFT extend my heartiest congratu Radio has broadened of late years into a means of enter tainment as well as of com munication Its methods are of increasing value in numer ous flelds It offers a multi tude of opportunities to men i who are not afraid of hard 1 work in pioneer directions It is belleved that the years wil bring an ever increasing number of openings for men trained in the various sub divisions of Radio Engineering and its applications A N GOLDSMITH VICE PRESIDENT RADIO CORP OF AMERICA The future of Radio with Its wonderful oppor tunities of development into the un
12. _NAT IONAL FROM N R I TRAINING HEADQUARTERS 1 Vol 2 WASHINGTON D C ACT a WWW americanracdiohistorv com No 6 In appreciation of the loyalty inspi ration and helpful co operation you have nm us as gradu ates Graduate Hoyt Moore in presenting President Smith with the beautiful loving cup shown here See page 8 ya WYP LE War un 7m W 3 5 h ug VEX X ER YE NO ANG BANNER RADIO YEAR AHEAD ROM all indications 1930 will be Radio s Banner Year It will offer more in Radio opportunity than at any time in the past Here are some of the reasons why N R I men can count on a big year right ahead First there is Television Some have felt that Television would be in the homes by this time but the more conservative of us have always believed that the Radio public wants Television to be just about perfect before taking it on Television has been in the laboratory for some time the kinks are being taken out of it Around 20 stations are broadcasting television several firms are manufacturing kits and even Tele visors and it is practically a certainty that it will be introduced to the public on a commercial scale very shortly Doubtless 1930 will see marked development in that field Then the sound engineering field will continue to make in creased demands for men with a knowledge of Radio s basic principles The country is going talkie Public address Sys t
13. a possibilities are at hand And so the industry must provide d the necessary components at first followed by kits and then practical televisors finally lead ing to the refined televisor which wil be incorporated in the same cabinet as the sound broadcast re ceiver 1930 will be the first television year C FRANCIS JENKINS JENKINS TELEVISION CORP WWW americanradiohistorv com NATIONAL RADIO NEWS 6 ANNIVERSARY NUMBER T LS I wish that every reader of the News could look over the hundreds of letters that come in every month from N R I men You would live their experiences see how they overcome their problems and push on to the ultimate success that rewards the man who follows a success proven plan of study Our space is limited it s impossible to reprint many of them so I can tell you about only a few of them here Student Ralph Copenhauer of Mt Orab Ohio had some responsibility on his shoulders when he installed and operated the public address apparatus on the steamer Cincinnati on which Presi dent Hoover rode and from which he spoke during his recent cruise down the Ohio River As many as 100 000 people heard the President s address over this apparatus several times during that trip A fellow doesn t mind that kind of re sponsibility though if he is equipped to deliver the goods Copenhauer was From all accounts the sales and serv ice supervisor of the Broo
14. echnical training WWW americanradiohistorv com ANNIVERSARY NUMBER 5 NATIONAL RADIO NEWS FIFTEENTH ANNIVERSARY Leaders In Radio Congratulate N RI And Point To Big Future Of Trained Man On the occasion of the Fif teenth Anniversary of the founding of the National Ra dio Institute I should like to lations No man familiar with the amazing and steady growth of the Radio industry throughout recent years can doubt for a moment that the successful solution of the many engi neering and servicing prob lems attendant upon this rapid growth has been tremendously facilitated by the work of your Institution in providing for manufacturers a source of trained young men upon whose shoulders can be placed many responsibilities McMURDO SILVER SILVER MARSHALL INC Only one home out of four is now equipped with a Ra dio Three fourths of the sets now in use are obso lete so it would seem that the surface has barely been WW scratched and the future of the Radio business is bright for years to come There is a growing demand for trained Radio men in this great industry POWEL CROSLEY JR PRESIDENT A CROSLEY RADIO CORP We need man power to continue operating on our present knowledge and we need man power to learn more about this remarkable science of which we have merely scratched the surface Radio s greatest need today from the technical side is Capable well trained men WILLIAM 8 PALEY P
15. ed as the official Service Station for Silver Radio in the eastern half of the State of Wash inEton and the State of Idaho As to the repair work since I opened my store at 2315 N Monroe I have had to employ a serv iceman in the shop and another to do the outside work I have the service work and the installing Of receivers from six small Radio stores to handle in addition to my own During the month of September I was handling all of my own work and now I have two service men and four salesmen employed I have paid for all of the merchandise material equipment and wages for October and I find that my profits for the month are over the 1 000 mark I am in Radio to stay as I believe it is the largest field today and in the future for EXPERI MENTS INVENTIONS and PROFITS WWW americanradiohistorv com aro ANNIVERSARY NUMBER Synchronism One of Television s Problems By S H ANDERSON Radio Engineer Clarostat Manufacturing Company Y HERE appears to be little difficulty in picking up television signals in almost any part of the country because of the dozen or so television broadcast ing stations However many experi menters complain about the difficulty of unscrambling the whirling dots so as to obtain satisfactory images The trouble is therefore one of synchronization or matching the speed of the receiving disk with that of the transmitting disk Certain television workers recommend synchronou
16. ems and sound projection apparatus will be installed in thou sands of theatres auditoriums amusement centers and other places through the year N R I men should get their share of this work Here is another factor that will make 1930 a big year in Radio The public has been pursuing a policy of watchful waiting delaying their buying of Radio apparatus until they are satisfied that receivers have been standardized and that their new set will not become obsolete over the week end That stage has been reached in Radio today Set design is fast be coming standardized The new sets equipped with remote con trol and other features should appeal to the buyer There are over 14 000 000 wired homes that today are without adequate socket power operated sets Improved types of battery receivers are available for the unwired home So it looks like a big year in sales service and repairs International broadcasting will be on a broader scale than ever this year Arrangements have been made between the American chains and the broadcast companies in England France Germany and other continental countries for more fre quent interchange of programs and American audiences will very shortly have the privilege of listening often to the best produc tions rendered by European Symphony orchestras The use of Radio in Aviation will expand in 1930 Govern ment plans call for an enlargement of the Radiobeacon system to make safe our trans continental passen
17. evious models The Radio Tri cian will find however that it is not necessary to remove the chassis from the cabinet to make this adjustment Through holes in the rear of the con denser shield four hexagonal nuts can be seen Turning these nuts to the right or left increases or decreases the ca pacity of the vernier condensers The adjusting may be done with a socket wrench of the Spinite type size No 5 Balancing at the factory is done with an oscillator tuned to 203 meters Since an oscillator is not at all times available rebalancing may be accomplished with the carrier wave of a station preferably two flat head machine screws There are also three small screws running through the dial strip into the dial segment on the inside of the drum The five screws two large and three small should be loosened just enough to allow the dial strip to be slipped around the drum under the dial segment After the dial strip is adjusted to the proper position the screws should be tightened STUDENTS GRADUATES In National Radio News every month you will get a complete Service Manual on some new standard model Radio set In past Issues of the News we have given you Service Manuals on Kolster Atwater Kent Zenith and other late models As you have found this is another feature of N R I training Screen Grid Philco Screen Grid and service that gives N R I men the advantage over others in Radio service and re
18. ger and mail lines Hundreds of point to point stations are being constructed to provide weather information and other data to planes in flight Point to point land Radio communication will be advanced So it s clear that this is going to be one of the biggest years yet for the man who knows Radio and when next Christmas rolls around I m sure that N R I men will have reaped a full measure of Radio s prosperity J E SMITH WWW americanracdiohistorv com ANNIVERSARY NUMBER National Radio News Published monthly in the interest of N R I students and graduates by the NATIONAL RADIO INSTITUTE 16th and U Streets N W Washington D C J E SMITH Publisher E R HAAS Editor Copyright 1930 NATIONAL RADIO INSTITUTE iii Washington D C Anniversary Number Speaking of Good Company HE home study trained man is in mighty good company these days George Geoth als the man who built the Panama Canal Walter P Chrysler the auto magnate Ramsay MacDonald Eng land s Prime Min ister all are home study trained men Frank B Kellogg former Secretary of State got most of his training at home Go into the offices of big corporations into the laboratories look over the engineers out in the field wherever you go you ll find hun dreds of the biggest men were trained by home study methods The man who sits down in the quiet of his home and follows the carefully planned practical
19. hich is in use in the British Isles Steady sure progress is being made in Television and it will pay every wide awake Radio man to keep his eyes on that field Nothing can stop it television is risht ahead of us J E S With the power clarostat it is rela tively simple to bring the scanning disk into step By studying the pattern of whirling dots and regulating the speed up and down one soon becomes aware of whether the speed is too fast or too slow The shifting of the pattern to one side or to the other indicates the speed of the receiving disk with relation to the transmitting disk The speed is gradu aly adjusted until the dot patterns be come solid masses and these masses evolve into animated subjects The speed is readily held by means of the accele rating button which simply short cir cuits the power clarostat The handiest form is the speed con trol elarostat mounted in a metal case complete with accelerating button How ever where the disk is mounted in a wooden cabinet the power clarostat can be suitably mounted with just the knob and the accelerating button exposed Aside from the problem of synchronization there is nothing very complicated about tele vision reception particularly the simple radio movies of black and white silhouettes broadcast by C Francis Jenkins from W3XK in Washing ton D C Television signals when handled on short waves can be received at distances of sev eral hundred mi
20. hms 14 ANNIVERSARY NUMBER a distant one between 200 and 250 me ters The set should be tuned to the station and without further turning the dial the balancing nuts starting with the one to the left turned until the peak of the signal is reached A tolerance of five meters is allowed between the dial setting and the given wave length of the station That is it may be necessary to rebalance a set so that it is off scale five meters each way from the wave length of the station in order to bring the set to the best operating point The differ ence in the dial reading may afterwards be corrected by adjusting the dial strip Adjusting Dial Strip The dial strip is held in place by the knurled dial segment which in turn is secured at each end to the drum with APPROXIMATE VOLTAGE READINGS A Volts Position BY of Tube 1RF 175 2RF a 175 DET T 90 1AF 55 2AF a 143 2AF 143 3AF 248 3AF 248 Type Tube 224 224 224 227 227 227 245 245 Volts C Volts Control Grid Screen Cathode Normal Plate M A Volts Volts 1 50 2 2 50 2 5 21 5 2 20s 4 13 5 iu 14 13 5 45 45 Line Voltage 115 Fuse in 120 Volt Clips Volume Control in Maximum Position Balancing of Set The set has been accurately balanced at the factory and should require no further adjustment but in the event it does become necessary follow instruc tions given below Rebalancing is done in the same man ner as pr
21. klyn Radio Company is an up and coming Radio man That s student Gabriel S Loudoux He s cleaning up on the new screen grid sets Judging from the Radio section of the New York Sun and several Radio maga zines Graduate Osgood of West Orange New Jersey is quite a technical Radio writer these days It s one thing to know Radio and quite another thing to write authoritative articles on the sub ject Osgood does Student Louis C Harder is another N R I man who is showing what con fidence and determination will do He writes I am now employed by the local jobbers of Radiola and Earl Radios thanks to you Mr Smith When I started my Radio course many of my friends said I was very foolish it was impossible to learn Radio by mail but if that was foolish I want to continue to be foolish as it has proved very profit able for me If some of you knew Student James T he STUDENTS Stagg Pratt City Alabama well any way he has a sure enough difficulty to overcome his legs are paralyzed yet he is going right ahead and making money in Radio He makes all of his service calls with the help of an assistant who assists him in and out of his car and does some of the heavier work for him Stagg s determination to overcome ob stacles ought to be an inspiration to many of us who think we have difficul ties Most of ours are imaginary if we ran into a real one we would find out what grit
22. known fields of public service depends upon the ability of men Only trained men with vision can delve into the unknown with success I believe that the Radio industry is the most interesting and most progressive of all It is interesting because of its great public service and it is progressive because it is new and many of its most im portant problems remain unsolved M H AYLESWORTH PRESIDENT NATIONAL BROADCASTING CO Congratulations on completion of fifteen years of training men for Radio work There is every reason to expect Radio to con tinue to extend its usefulness as it has in the past Your contribution to this growth Is an essential one since modern civilization increasingly depends upon the man with specialized training J H DELLINGER Director RADIO LABORATORY BUREAU OF STANDARDS Hearty congratulations to the Institute on the remarkable work being accomplished I wish to compliment the graduates and students on their commendable efforts in seeking more knowledge in this highly technical field Radio needs the American youth as inventor technician and ex pert and a technical education is vital PAUL A GREEN CHIEF ENGINEER COLUMBIA BROADCASTING SYSTEM The Radio industry during 1930 must take television seri ously With the inauguration of television transmitting sta tions operating on a regular schedule there is certain to be widespread interest in television reception Vast experimental
23. le distance from the centers of population The combined engineering and re search forces of the Radio Corporation of America the General Electric Com pany and the Westinghouse Electric amp Manufacturing Company have been at work on this new conception of an effi cient battery operated radio receiver After many months of intensive effort such Radiolas have been developed and will soon be made available These new sets will not be simply revamped ver sions of old storage battery or dry bat tery radio sets Instead they will be entirely new conceptions of battery operated sets designed to establish rural selectivity simplicity economy tone and radio more on a par with metropolitan radio In the matters of sensitivity power there will be little more to ask for SELL THE FARMER I have built quite a few sets besides service work Some weeks I make as high as 25 00 in a few hours spare t ime Lynn Henderson 817 Elgin Court Jackson Mich I have the agency for three of the best stand amp rd Radios and I purchased a Supreme testing outfit built me a work bench and put in a stock of equipment The result is work and more of it I am clearing around 15 a day Jesse A Stil Beach North Dakota WWW americanradiohistorv com ANNIVERSARY NUMBER Photo Electric Cell Has Big Future By JAMES A DOWIE Chief Instructor Member I R E Rie ADIO TALKING PICTURES and TELEVISION have simply enabled
24. les with any short wave set and suitable amplifier While the pictures themselves are of little intrinsic interest the novelty of re ceiving pictures through space makes such ex perimental work quite thrilling WWW americanradiohistorv com NATIONAL RADIO NEWS 8 ANNIVERSARY NUMBER Vice President Curtis Cor Choice of Radio A OUTSTANDING feature of the recent Anniversary Convention of N R I graduates was a short address by the Vice President of the United States in front of the Senate Office Building The Vice President himself gained practically all of his training by his own individual efforts years ago in Topeka While a young boy he read law by the light of a smoky oil lamp on the dashboard of the old hack he drove Group of N R I graduates addressed by the Honorable Charles Curtis Vice Preside that background mean much to N R I men who are making their way in Radio by studying at home in their spare time In a brief yet straight forward talk to the men the Vice President congratu lated them upon their choice of Radio as a profession and said that there is no greater opportunity in America today than Radio for men and young men seek ing a profession The picture of the Naturally the words of a distinguished public official with group as well as the words spoken by the Vice President were recorded by the Fox Movietone News and will probably be seen in theaters throughout the country in the near fut
25. pair work J E 8 WWW americanracdiohistorv com ANNIVERSARY NUMBER Extras That Count An important factor in the success of N R I men is the persistent helpful co operation given them by the Graduate Employment and Publicity Departments of the Institute These services are available to N R I men for all time Employment Manager Murray keeps in close touch with the industry labora tories dealers broadcasting stations in fact wherever Radio men are used He places hundreds of graduates in good jobs every year and helps those who al ready have jobs get promotions As to publicity there are hundreds of newspapers and magazines which carry stories about Radio Tricians In one month alone there have been as many as 67 000 000 copies of newspapers which have published news about the Institute and the part its graduates are playing in Radio More than 118 Radio stations are broadeasting daily short Radio talks written by Mr Smith and Mr Dowie on various Radio subjects This vast amount of publicity creates good will It acquaints Radio minded people everywhere with the work the Institute is doing and the type of gradu ates it has It plays the Radio Trician up in the public eye and helps him make good Every N R I man necessarily shares in this tide of prestige and good will created by this work It s an in valuable asset just another reason why N R I men go farther in Radio I am happy to say tha
26. portions that a survey of its present sit uation and a forecast of its future would fill many large volumes In every line of human industry in America Ra dio is playing a more and more important or indis pensable part Besides the almost limitless fields of communication by wire and wireless telegraph telephone photographie and facsimile transference the railroads now use Radio in signaling and safety de vices Even passenger elevator installa tions are beginning to use Radio The science of Aviation depends more and more on Radio for signaling and guidance The multitudinous uses of Radio in marine service are constantly increasing for direction finding fog sig naling ticker service telephone and weather map service on shipboard Today Radio is being used to locate ore and oil deposits in the western ranges Television with its unlimited possibilities is rapidly approaching the dimensions of a great industry I have not mentioned the Radio Manu facturing Industry with its 600 000 000 of annual turnover its half million or more of employees operatives superin tendents managers engineers and direc tors Nor the tens of thousands engaged today in the manufacture installation and servicing of talking motion picture theatre equipment Nor the research engineers and laboratory assistants in tensively engaged in invention and de sign of better amplifiers and acoustic de vices all the direct outgrow
27. s have already made a number of experiments of the use of 11 NATIONAL RADIO NEWS the photo electric cell in industry They have been used to measure the width and test the texture of textiles select the proper grade of tobacco in the making of cigarettes and in the future this mar velous tube may be used in countless ways One authority recently predicted that within 10 years more tubes would be used in industry than are now used in the 12 000 000 receiving sets in the United States We think of broadcasting today as a means of entertainment but this is only one application of Radio telephony It is only a matter of time before the Radio telephone will link the continents of the world and the telephone systems of every country Then the greatest artists and musicians will perform daily for world wide audiences and with the coming of television we will be able to see also these performances with our receiving sets This will promote the cause of in ternational understanding affection and peace among all countries with this in ternational contact and communication These predictions may sound extrava gant at first reading It may seem that many years must pass before the eco nomic and technical problems which will extend the usefulness and application of Radio broadcasting and picture trans mission to so great an extent can be solved However the wonder of today is the accomplishment of tomorrow The op portuni
28. s motors This practice is ideal in certain areas served by the same alternating current power system The same alternating current supply insures absolute regulation of both transmitting and receiving disks operating on the common power supply However when the transmitter and receiver are located in different power supply areas the syn chronous motor is no longer such a happy solution The use of a synchronous motor with friction drive as recom mended by Jenkins in particular does not prove so effective in most cases be cause of the slippage between driving and driven disk The leading television workers have found the variable resistance method of controlling speed the most satisfactory Here the problem is to have a variable resistance that is stepless so as to ob tain precise speed adjustment together with a steady resistance value at any set ting The problem of developing a suit able micrometrie resistance has been far from simple for most variable resistors are not intended for handling the con siderable current called for in a motor control application Nevertheless by cer tain detail changes in our power claro stat we have succeeded in evolving a device that provides the necessary step less resistance range together with a current handling capacity of 80 watts or more than ample to control the usual motor of th horsepower or less 7 NATIONAL RADIO NEWS The first picture of the Baird televisor w
29. t although it is less than two months since I enrolled for the N R I course the knowledge which I have gained in this short Space of time was sufficient to enable me to land amp job as Radio Trouble Shooter with the Philco Storage Battery Co and at twice the salary which I was earning at my last Job In addition to the increased salary there is plenty of room for advancement Stanley Allen Moss 2651 8 Fairhill St Philadelphia Pa Repairing pays me as high as 15 a day and my sales average about two sales a week I m very busy too busy to study my lessons I m only sorry I didn t take my course sooner 80 I could devote all my time to business and render better service I m going to employ two men in a few days to assist me in my sales and repair work John Fandrick Devil s Lake N Dak The men at the top of the success ladder didn t get there in one jump Success comes by master ing one job at a time It s the doing of little things well that leads one to the bigger Jobs I thought when I started to take up your course that I knew a lot about Radio but I see my mistake Now I can often surprise a few of our radio dealers in town which claim to be good I think the course is easy practical and interest ing all the way through By the aid of the work sheets you send you sure can get anywhere you want on any set for they help you right along A A Pasa Box 405 Cle Elum Washington 15 NATIONAL
30. th of the Radio and intimately related to Radio With such an astounding situation such unlimited possibilities and un precedented opportunities for the young man who is wide awake ambitious and industrious need anyone ask advice re garding the possibilities of finding inter esting and lucrative employment with a prospect of rapid advancement in the field of Radio It s a fine thing to answer when opportunity knocks at your door but if it s a little late don t wait Get out and stir up your own opportunity Training is the best hours with low bay insurance against long WWW americanradiohistorv com NATIONAL RADIO NEWS 4 ANNIVERSARY NUMBER THE N R I CELEBRATES In the little room shown in upper left hand corner the first N R I class met back in 1914 Below is shown a section of the Student Service Department of the Institute today In other parts of our two story home are housed the Graduate Employment Stenographic Publicity and other departments The helpful service that my staff renders enables N R I men to o farther in Radio and is also responsible for the growth of the N R I J E 8 IFTEEN years ago the National Radio Institute was founded Mr Smith and Mr Haas equipped a little 10x12 room with a code machine and started out with a class of four students That was six years before the first broadcast station was built Radio sets as we know them today were unheard of Indeed there
31. ties to capitalize on a knowledge of radio are bound to increase at a rate which is unsuspected and far beyond the dreams of imaginative prophets The accomplishment of these things will mean a great deal of work and require the services of vacuum tube and photo electric cell experts WWW americanracdiohistorv com NATIONAL RADIO NEWS 12 ANNIVERSARY NUMBER Radio Trician s Service Manual on Zenith Models 52 53 54 522 532 542 The Zenith 50 series circuit incorpo rates three stages of audio frequency amplification The first stage is resist ance coupled the second push pull using two 227 tubes and the third also push pull using two 245 tubes Only two push pull transformers are shown in the diagram the third being in the speaker The plate circuit from the output or third transformer is completed through the cable provided with the 5 prong plug The grid bias for all tubes excepting the UX 245 or C 345 tubes is obtained by usual voltage drop through resist ances connected between cathode and ground 2 condensers are connected across the resistors Instead of the usual grid leak and condenser in the detector grid circuit the linear detection method is used This consists of a 50 000 ohm resistance paral leled with a 2 condenser between detec tor cathode and ground This method allows a greater amount of volume in put to the detector tube without block ing or distorting as is the case with the other
32. umber of stations increasing their power and en larging their equipment The more powerful the transmitter the less sensi tive the receiver must be and the less trouble with interference set up by out side agencies The General Electric Company has re cently been granted an experimental license by the Federal Radio Commission to operate a 200 000 wstt station That is a far cry from the old 100 watt sta ARRE SU SU SUR SOR SURGE AREA Re THEY CAN T ALL BE WRONG e President Hoover has said The progress of Radio in the EA next score of years will equal or exceed that of those just past Za ES Owen D Young of General Electric recently said It is NS BA what Radio engineers don t know about Radio today that 2 p makes me so confident of its future ex Vice President Curtis told N R I graduates There is no ex greater opportunity in America today than Radio for men and gt young men seeking a profession ARAKAS AS BEB SAS SAR GN AM tions that used to be considered the thing in Radio broadcasting Equip ment of the kind shown in the above pic ture costs plenty of money and it is not going to be turned over to men who have learned their Radio by the hit and miss method such equipment must be oper ated by men who know their Radio The N R I is well represented in the broad casting field by its graduates The latest check up shows that N R I men are op erating in around 90 stations They
33. ure In the picture above you will see the 80 graduates who attended the Conven tion They represent 32 States of the Union and 2 provinces of Canada It would have been utterly impossible to have all of the graduates of the National WWW americanradiohistorv com ANNIVERSARY NUMBER NATIONAL RADIO NEWS 1gratulates Graduates on As A Life Work Radio Institute present for a convention so representative ones living in widely separate parts of the country attended After the address by Mr Curtis the graduates were taken on a sight seeing tour of Washington They visited the Library of Congress the Capito Build ing listened to the remarks of mem bers of the Senate visited the White the United States House the Bureau of Standards Arling ton Naval Radio Station the Academy of Sciences Lincoln Memorial and the Smithsonian Museum They spent sev eral hours in going through the various departments of the N R I They saw for the first time the spacious Instruc tion and Student Service Departments They saw how Mr Smith with Chief In structor Dowie were assisted by their large staff in training and serving thousands of students and graduates all over the world First Alumni Association Organized The Convention came to an end with an elaborate banquet at the Arlington Hotel Noted guests including General George O Squier the Army Radio au thority Arthur Lynch of Radio News uM Am S gt
34. was little to encourage the founders Even their friends laughed and said that wireless was just a fad that would soon be forgotten But Mr Smith and Mr Haas foresaw a huge industry in the making that would offer unbounded opportunities to trained men yes they envisioned a world in which Radio would play a dominating part Their prophecy has come true And along with Radio s giant strides the N R L pioneer Radio home study Institute has grown The success of the thousands of ambitious men it has trained and is today training has made possible the growth and widespread fame of the Institute E The Institute today occupies its own beautiful building on 16th Street Wash ington s finest It s Instruction Service and Administrative staffs occupy the 12 000 feet of floor space A trained staff of 125 assist President Smith Vice President Haas and Chief Instructor Dowie in giving every possible service and assistance to N R I men the world over Never before has the Institute been so ably equipped to train men for the Radio field Never before have Radio opportunities been so abundant President Smith sums it up in these words Little did I realize when I faced the first class of four students that I would have the opportunity of fitting many thousands into profitable Radio work and on this 15th Anniversary of the founding of the Institute I want to pledge anew my faith in the future of Radio and of the man who faces it with firm t

Jan - American Radio History

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