Radio Digest (Oct 1923-July 1924)

10 RADIO DICES T— Illustrated June 7, 1924 .the THIRTY MINUTE A-B-C s wave . n be used to BROADCAST., STATION^ ^^A BROADCAST STATION *3 PigTire 121 without Kumbar ' I. Loop Connections Loop sets usually employ Radio freuapUfleatlon but results can be a loop with a vacuum tui . litable connections loop will be .rough a S(:..s condenser to the LOCP 4-3 PLATE. CON DENSELR. / Figure 122 standard type of receiving set at its inals marked aerial and ground. This is shown in Figure 122. Non-directional Loop A loop will not act as just explained if one end is grounded as shown by Fig 123, but this will sometimes increase the energy available for the receiving set, phantom action, as shown in Figure Loops do not work very well inside of 1 buildings, especially if the walls tain metal lath. In such cases, when set sufficient energy to work, the .1 effect is likely to be erratic. etimes the loop in a steel building will stations only when located in r of a room, cornerwise. pt for locations within a few blocks of a broadcasting station, it is not feasible to use a loop to operate a simple crystal type sot satisfactorily. A single-tube set oration will get enough from :. loop up to a d. stance of ten 'iniles from a broadcasting station. The range Of a loop can bo extended to reach as far as a good aerial by employing two or throe stages of Radio frequency amplification. Size of Loop The larger the size of the loop the fewer the turns used for a given wave length, hut bulky sized loops are unsightly so that most loops will be made from IS Inches to perhaps three or four feet in diameter. A suitable size for broadcast reception with a parallel tuning condenser of 001 mfd. maximum size, is made by supporting 100 feet of wire spaced as turns »-> inch apart on a framework 3M: feet across. The wire used should be number 14 to 18 in size and may be insulated if desired. In first picking up a station, a loop has NOW— NATION-WIDE RECEPTION ON THREE [3] TUBES GUARANTEED New.'! vV» ScoringCommittee of Philadelphia, Pa., hears 49 stations from Cuba to Los Angeles sign off in' 8V2 hours. THE NEW DE LUXE AMBASSADOR "Wins Competi tive Distant Test of "New Yor k Evening World." The only PERFECT score GROUND Tigure 123 to be pointed approximately correctly to get enough energy to operate the set. Reference to a map showing stations will show directions, which may be checked up. An important point to remember is that after the waves cut the wire of the aerial or loop, a Radio frequency electric current is caused in the wire and flows rapidly back and forth. Essentially the process of catching waves thus comprises the step of changing them from radiated waves to electric waves in the input circuit. ("The Radio Detective" is the mysterious title of Mr. Edelman's next chapter, to he given next week. But then its not as mysterious as it sounds, when told in the simple language of the "Thirty Minute" series. It will tell what a detector really does. — Editor's Note.) ~^ RADIO C I -X_6ATTEnjES '""'"C^ /'l)~y*. CHARGES *►"» / -Sf RADIO 5_ vi" * BATTERITS 5^* V CHARGES -? AUTO "fi BATTERIES FREE Battery Bulletin with Station Calls (\ -r<* This brief treatise on battery upkeep, an up-todate list of station call letters, and wiring diagram for basement installation of batteries is yours for the asking. Write us today. Let us again remind you that the type AB F-F battery charger is a Triple Duty Battery Charger, charges Radio "A," Radio "B," and Auto batteries. The type 6 F-F charger charges Radio "A" and auto batteries. Type AB, price $20; West of the Rockies, $22; Type 6, price $16; West of the Rockies slightly higher. Success Like This This set completes two months building and discarding 104 sets for this now unique success. With genuine Litzendracht wire entirely winding the incomparable genuine Ambassador coil I have created a 3-circult design without equal for quality, and priced so that the whole world may buy. Never Before in Radio a The Radio Shack is the first to discover the ideal use in this , country of Litzendracht wire. With its aid the new "De Luxe Ambassador" achieves the modern ultimate of what both rankest amateur and ardent expert have sought. The amazing performance, selectivity, DX, volume on loud speaker, dwarf all description. The "dying signals" are almost unknown. Extraordinary distance reaches the detector faithfully and clear. The marvelous tuning coil even has no taps to make unsightly panel and dead-end loss. The contacts are self-cleaning, self adjusting and compensating. The whole design goes snugly behind a 7x10 panel. There are no imitations. IIIIIIIIIIIIIIIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIHIIIIIIIIIIIIlllllllllllllllllllUlllllllMllllinillllllllllllllllHIIIIIIIIIIIIIIIII THE FRANCE MFG. CO. 10420 Berea Road Cleveland, Ohio London Office 24 Maddox St. Melbourne. Australia P. 0. Box 1727 ■HHMH lilllillliliiillililriiiiuiiiMiiuiiiiiiiiiiiiHitiiiiHiiiiiiiiiiiniiiiniiitiiiiiliililiiiniiiiilMniMniiiiiiiiiuiiiiiitniiiMlllliiiuM A^Xoo,ooo.oo Company l'5 fif. Stands Squarely Back KIT CONSISTS OP 1 DRILLED 7 x 10 Radion Mahoganite Panel, engraved in Gold. 1 Genuine Ambassador Master 3-Circuit Litzendracht Tuning Coil. 1 Genuine Comsco Bakelite-End Condenser. . 1 Triploid Mounting Socket. 2 Premier Hegehog Audio Transformers 4 Brunswick Underslung Foundation Brackets. 2 Brunswick Jacks with Gold Plated Fronts; 1 for phones; 1 for loud speaker. 1 Freshman Mica Grid Condenser. 1 Standard Glass-Enclosed Grid Leak. 2 30 Ohm Shackton Bakelite Rheostats. 2 Moulded Mahogany Dials grained to match panel. 5 Lengths Professional Round Bus-Bar. 1 Set of 7 Moulded Engraved Binding Posts completely mounted. 1 Special Blue Print for this circuit. Not an ordinary hook UP Clear picture form child can understand and make. All packed in handsome box. Complete, Only $25.95 c. O. D. C.O.D. Send No Money ACCESSORIES Everything needed to operate after building is listed here — 3 Type 201-A Tested Tubes $11.70 1 60-Ampere Hour Storage Batt $11.25 2 45-Volt Extra Large Enco "B" Batterit-s $6.50 1 pr. 3000-ohm Head Phones and Cord $3.75 1 Phone Plug, Double $0.90 1 Antenna Equipment $1.50 Complete outfit, $35.60 (Parts Also Sold Separately) CABINET FREE Order Building Kit and Accessory Outfit both together, and we will send Fine Mahogany Finish Cabinet FREE. We ship C. O. D. When shipment arrives pay your postman. Then build vour "De Luxe Ambassador" under our WRITTEN MOXEY-BACK GUARANTEE. No radio knowledge or skill needed. Only 1 to 2 hours time. Tou cant go wrong. Remember, you buy SAFELY from The Radio Shack, the Largest Radio Dealers in America — built upon Quality, Service and Value. Be First in Your Town— Send Your Order Now of Every^Phone GREATEST HEADSET VALUE (Plus a feu> cents postage Send No Money Order by mail if your dealer cannot supply you and we will ship immediately. Written 5-day money back Guarantee with each set. Our next year's production schedule of two million phone* UN* DOUBTEDLY placet us a* the Worlds Largest Headset Makers THE TOWER MFG?CO. 98 BrookljneAve. Boston Mass. 9fr RADI © HACK Executive Offices, Dept. RD531 55 VESEY ST., NEW YORK CITY Goods shipped C.O.D. Just pay the postman *VEnV yWtvO* SOlo OS WRITTEN Mist* BACK Cl/AUM^1 We acknowledge all order* same day received, and ship sane day or oext day. Written Money-Back Guarantee with every purchase. We answer all letters we (et on same day we set them. This is Radio Shack. SERVICE. which continues after sal*. Mark X here ONLY if you want DL Amb. Set S25.95 THE RADIO SHACK, Executive Offices, Dept. RD531, 55 Vesey St., New York, N. T. BIG FREE CIRCULAR MARK X HERE Mark X here ONLY i! you want ALL additiona 1 KC cessones. Ship me C. O. D.. subject to your WRITTEN Money-Back Guarantee, the groods for which I have marked X in the proper square (or squares). I will pay postman on delivery. If >ou want special accessories, attach selections from list of letter to this NAME (print plain).. ADDRESS _ I