Radio Digest (Oct 1923-July 1924)

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March 29, 192k RADIO DIGEST — Illustrated 13 30 Minute A-B-C Lessons for Radio Beginners Chapter II — Radio Energy in Everyday Terms By P. E. Edelman IN this series of articles the story of Radio will be told in so simple a manner that the uninitiated can follow theory and practice whether he knows anything about electricity or its application to broadcasting and reception or not. The series will consist of twentyfour additional chapters, of which the five next will be: Chapter III— How Radio Is Broadcast. Chapter IV — What Radio Inductances Do. Chapter V — What Condensers Are Good For. Chapter VI — Uses of Resistance in Radio. Chapter VII — Essentials of Radio Electricity. RADIO may be understood with reference to commonly known things in daily life because the complicated art is made up from understandable principles. The Sun is the original broadcast station, sending waves recognizable as light and heat and comprising tremendous energy. Human beings take a small fraction of such heat energy, convert and control it in suitable form; then use a tiny amount of it to enjoy broadcasting. How does Radio fit in with other forms of energy? Heat is a motion in material and can be felt. Light is a much faster wave motion which can pass through space. Sound is a slow wave motion energy, and an artificial apparatus eye or ear must be used. Radio energy is a 1 /INCANDESCENT a />FjJ-AMENT LIGHT WAVES ARE TO SHORT TO PASS THROUGH ATHIN ABSORBING WAUL . LIGHT WAVES CAN PASS TRROUGH SPACE Figure 4. wave mo'tion which can be considered as extremely long light waves. Radio is tike Light Figure 4 illustrates a familiar source of artificial light. Light rays from the hot filament in the lamp pass through the space in the vacuum bulb and can be seen by the eye. Light is a commotion in space in regular wave forms recognized as the colors of the rainbow. There are some kinds of light which the eye THICK WALL (SMALL FRACTION OF RADIO WAVELENGTH THICK RADIO SHORT WAVE GENERATOR. THIN WALL (MANY LI6HT WAVE ■ U LENGTHS THICK) Figure 5. EVEN THE SHORT RADIO WAVES ARE LONG COMPARED TO THICKNESS OF A BUILDING WALL AND CAN PASS THROUGH through the air or material, which can be heard. But nature has not provided a sixth sense to directly recognize Radio does not see but which can be recorded on a photographic plate. The wave lengths of light are all extremely small BRINGS IN EVERYTHING BEAUTIFUL MAHOGANY NEUTRODYNE WHEN you get this magnificent looking set wired and hooked up, you will be able to hear all stations without interference. AH parts are same as illustrated in Radio Digest, Feb. 2nd. Panel is mahogany with beautiful mahogany dials — a set fitted for the most exclusive home. Panel drilled, all parts mounted on panel and baseboard ready for wiring PAY NO MONEY _««««^MMMBBl °nly Just Pay the Postman m ^OTJlfflM a d* A /"\ PA * READY TO //\ WIRE 5 Tubes $25^ I 110 Ampere Storage Battery 18. w I DeLuxe Homecharger '5'SS . I Headset 1200 Loud I Complete Aerial Equipment 1-50 I 45 Volt B Battery 5-50 The above parts and equipment complete would cost you $147.' FREE BLUE, PRINT* The above Neutrodyne Complete ready to wire following parts: 2 22'/2 Volt B Batteries $6.00 $86.00 Speaker 12.50 TOTAL $98.50 Our Price $125.00 It Works — NEUTRODYNE — All Standard Parts 2 Rheostats, 30 ohms $ 2.00 I Rheostat, 6 ohms 90 3 Air Core R. F. Transformers, mounted on condensers, and 2 balancing condensers 20.00 I Potentiometer, 1850 ohms 1.85 3 Jacks, Carter 2.70 I Condenser JO I Grid Leak 05 5 Sockets, Kellogg's 5.00 2 Transformers, All American $ 9.50 9 Readem Binding Posts 85 I 8x26 Mahogany Panel 3.64 4 Bezels 80 3 D ials 4.50 I Baseboard 50 24 ft. Square Bus Wire 60 Total $53.89 Panel not mounted or drilled, only $45.50 with blueprints FREE CABINET FOR YOUR REFLEX NEUTRODYNE Same Cabinet as shown on page 26, Radio Digest, March 8th issue With Baseboard, High Mahogany Finish — Fine Cabinets 9x14x8. List $12.00. Only 7x16x8— Same quality $5.98 .$5.98 A Few Left— BALDWIN UNITS Genuine Baldwin Type C unit with mica diaphragm, list, $6.00. Only... ONLY TWO TO A CUSTOMER $3.19 Special Sale on Webster Condensers, Fine for Super-Heterodyne Variable Condenser, .0005 (Same as 23 plate) $£ Qfl yariaWoJCondonser, _ .001 (Same as 45 plate) $2.98 list. $5.50. While' they last— Bargain at <]»£■. JO list, $6.00. Big buy at. We are responsible folks, money cheerfully refunded within ten days if you are not satisfied ~ All Orders Mailed Promptly. Send Check or Money Ordor No Stamps Accepted. Quality Merchandise at Low Prices Every . thing in Radio Write Us Economical Radio House 4600 LINCOLN AVENUE, CHICACO We Personally Guarantee All Goods compared to the greatly larger Radio wave lengths. Radio Light or Radio energy travels at the rate of 186,000 miles per second. Referring to Figure 5, it is well known that light does not pass an opaque wall, while Radio goes right through. That is why broadcasts go into a building or room. Now, the longest light wave lengths are recognized as the dark reds, and If the eye could see still longer wave lengths, we could see Radio. Difference of Radio and Sound The difference between sound waves and light, or Radio waves is illustrated in Figure 6. An electric bell is put In an evacuated jar from which the air is pumped out. The eye can see the bell ringing but the ear cannot hear it, as sound does not pass through space but DAY AND NIGHT As you talk, little undulations or puffs of air move out from your lips In an GLASS VACUUM JAR. SOUND WAVES CAN ELECTRIC BELL ; ONLY PASS THROUGH .Alft OR A MATERIAL '/> EAR DOES NOT HEAR THIS BELL DAY NIGHT EARTH ONE CYCLE PER. DAY (24 HOUR$> POWER LINE ^ ORDINARY H0U5E ELECTRIC CURRENT 60 CYCLES PER. SECOND. (LOW, OR. AUDIO FREQUENCY) MOTOR. Figure 7. requires a material conveyor. Sound waves are also of such length that they cannot readily pass through thick walls. assortment of wave your vocal cords. (Continued lengths governed by These are recognized on page 22) A Record of Achievement The remarkable performance of the Moon G-2-A Receiver under difficult conditions of reception, as outlined in the examples below, shows very clearly its universal utility as a radio instrument of high calibre and special adaptability. In the Home: On a Railroad: On a Steamship: In a Mine: Using only one wire as a ground attached to a water pipe, the Moon Model C-2-A has brought in stations as far distant as 1,800 miles. Consistent reception of stations 1,000 miles away is always possible. The first transcontinental radio equipped train over the Canadian National Lines carried a Moon set using a terrapoise ground. Stations up to 1,100 miles distant were brought in thruout this entire trip. A Moon set installed on the S.S. Fort Victoria of the Furness-Bermuda Lineson the regular run from New York to Bermuda was able to bring in stations as far as 1.450 miles away. This reception was obtained in the middle of the summer when the static was at its worst. A test under the auspices of the Scranton Times was held on January 17th in the furthest depths of the Pine Brook Mine. The Moon Model C-2-A brought in stations 500 miles distant as well as the local station which was broadcasting a special program for the test. AH of the above results were obtained with volume sufficient to operate a loud speaker. The Moon Model C-2-A has proven that even under the most severe conditions "It gets them all." Manufactured by Moon Radio Corporation 501 Steinway Ave. Long Island City N. Y. C-2-A RECEIVER "It gets them all" ■ Sold by Bunnell Radio Corporation I. imc Island City N. V. , _