Radio mirror (Jan-Oct 1923)

RADIO DIGEST — Illustrated October 6, 1923 Questions and Answers Two Tube Super (4816) AW, Evanston, 111. I have noted the two tube super-regenerative circuit shown in Mr. Benson's article in Radio Digest July 28. If it is possible for you to do so please print additional information about this circuit. Could a variocoupler or a variometer with stator and rotor winding separated be used in place of the honeycomb coils in the circuit of detector tube? To a variable coupling between the D. L. coils, are 1250-250-1500, turns necessary? If so, can they be mounted as shown in the description of the single tube circuit of August 4? Should the D. L. coil, 250 turns, be mounted between the large coils in this case? A. — A standard variocoupler can be substituted for the honeycomb coils indicated. A variable coupling is necessary until the point of best operation is found. Coils can be mounted as suggested. The 250 turn coil is not in inductive relation to the 1250 and 1500 turn coils. Body Capacity (4723) JLR, Allegan, Mich. I am a reader of your publication and would like to ask a question relative to my single tube variometer coupler regenerative set. My entire tuning panel is shielded with tinfoil; this shield is connected directly to the ground binding post. I get satisfactory results excepting that after tuning in a station it is necessary to keep my hand on the variometer dial or the set will howl and the station tuned in will be lost. I do not use a variable condenser with this set. I will be very appreciative of any help you can give me in regard to eliminating this trouble. A. — The action cited is characteristic of a variometer set. It will be overcome by placing a 3 or 5 plate variable condenser across the secondary of the variocoupler. After the circuit has been tuned use the condenser to compensate for the difference in the wave length caused by the hand capacity. Rotary plates of the condenser should be connected to the filament side of the secondary to eliminate body capacity effect. TWO SUPERSENSITIVE CIRCUITS (Both Copyrighted) My Highly Improved Reinartz brings in all important stations on both coasts and Mexican border. loud, clear and without distortion. We dance to music from Atlanta received on one loud Baldwin unit. Build one of these wonderful sets from my blueprints and specifications, price 50c, or with a perfect and complete double wound spiderweb coil, §3.00 by mail. No other windings used. Pfaoto of my set on a glass panel with every order. This copyrighted circuit is the most successful of any Reinartz modification yet produced, and is imitated the most. Thousands are in use. My W. D. II Circuit is especially designed for use with the "Pickle" tube and brings out the full value of that little tube as no other circuit can. Stations 1000 miles away come in clearly on one tube. This set is small, complete, portable. For the man who wishes the highest efficiency, this is the set to build. Price of blueprint and specifications, 50c, or with complete and perfect windings, $3.00. Photo of set with every order. Sets built from these plans will receive all broadcasting stations operating under the new laws. Their wave length range is from 170 to 800 meters. AUXILIARY TUNER This new instrument connected to your present receiving sot with one wire enables you to easily bring in both the long and short wave stations which you cannot get with your present equipment. It also enables you to eliminate that local interference so you may listen to distant stations. Copyrighted diagram and complete instructions for building and operating this instrument, 50c. or with all parts, including Condenser, Coils, Switches, and Panel. $8.50. Complete instrument, $15. All goods prepaid. These instruments are easy to build, easy to operate. Everything clearly shown. S. A. TWITCHELL 192S Western Avenue, Minneapolis, Minn. Regenerative Circuit with Amplifier (1817) WG, Roanoke, Va. Will you send me a hook-up consisting of the following parts .001 condenser. 180degree variocoupler, variometer and a | From 392 meters to 509 meters it works very well. I have been able to get as low as 309 meters and as high as 517 but in both instances the reception has been very thin and mushy. I have added to this circuit a wave trap in the aerial N7 two-stage audiofrequency with jacks, not filament lighting jacks? A. — Complying with your request, we are giving a diagram of a circuit conforming with your specifications. Either the variometer or variable condenser shown in the secondary circuit may be eliminated (not both, however). If both instruments are employed as indicated the circuit will be capable of twice the wave length possible with only one of these units. Allen Regenerative Circuit (4712) CHN, Paoli, Pa. Referring to your circuit 01321, Radio Digest, November 4, 192"2, please note the following: I have been using this circuit for some time very successfully, finding it especially good during the summer months, being able to work as far west as Omaha, in the middle of July. However, I am handicapped in one way — it does not work very well on the new short wave lengths. r '^bfksuTmiK^ro^erVice' > "THE ACCENT IS ON SERVICE." 14-16 Vesey St. NEW YORK Our appreciation of your orders is expressed in the Quality of our merchandise and prompt service. VARIOCOUPLERS $3.50 Workrite 180° $2.95 3.00 Rhason 1S0» 1.95 3.50 Fisher, Large, 180" 2.25 3.50 Fisher. Large, 90° 2.25 2.75 Fisher. Small. 180° 1-75 2.75 Fisher, Small. 90° 1.75 VARIOMETERS $3.50 Workrite $2.95 8.50 Render. Molded 4.45 3.50 Fisher, Large 2.65 CONDENSERS 82.00 R. C. 11 plate $1.05 2.35 R. C 23 plate 1.35 2.75 R. C. 43 plate 1.65 VERNIER CONDENSERS $4.00 Precision 23 pi $2.25 5.00 R. C. 43 pi 2.95 SOCKETS $1.00 Magnus. Aluminum $0.45 .75 Bakelite 45 .50 Composition, Mid 30 RHEOSTATS Pacent, 6. 10, 20 or 30 ohm $0.95 Seiss, 6 ohm 60 Tillman, 6 ohm 45 Tillman. 30 ohm 60 Ajax Combination Socket & Rheostat.... 1.55 PHONES $6.00 Brandes Superior $5.25 12.00 N. & K., Imported 5.50 5.00 Nerco 2.50 Ambassador 3.89 Mail orders promptly attended to. All orders amounting to $5.00 or more will be shipped prepaid. Will ship C. O. D. unless remittance accompanies order. The Crystal That Brought Joy to 100,000 Radio Users Last Season. Sent on approval. Pay us 50 cents when you are satisfied. That's how sure we are that it will please you. Just pass the good news on to a dealer so others may enjoy B-Metals too. Just send us the name of dealer who hasn't heard of B-Metal when remitting. The B-Metal Type C Fixed Detector for Your Reflex Set — Try One and Know The price is reasonable when you see what it does. Thousands in use. Read one of the many reports. B-Metal Refining Co. Pittsburgh, Pa., June 4th, 1923. $2.50 Gentlemen: — I enclose check for $3.00 in payment for the Reflex and B-Metal crystals recently sent me on trial. The Reflex detector is entirely satisfactory in every respect, in fact, much better than I expected. I am using it in a three-tube circuit. Very truly yours. G. HAUDEMAN. 5532 Howe Street. For Sale by All Dealers B-METAE REFINING COMPANY 3134 Trumbull Avenue. Detroit. Mich. lead. Can you tell me what to do to enable me to get 360 meters and less in a satisfactory way? Across the variometer leading to the audio transformer I have a vernier but even this does not split certain waves on the short or high lengths. Will you please give me a hook-up and indicate the switch to use so that I can « Mb Ready for Immediate Delivery — ALL PARTS FOR THE Acmedyne Circuit as described by Mr. Lawrence Coekaday in the August issue of "Popular Radio," employed in the wonderful Melco-Suprcme Receiver. Tuned Radio-Frequency at Its Best Telos Vario-Transformer $8.50 Telos Variometer $6.00 AMSCO Compensating Condenser $3.00 Complete knock-down parts for Melco-Supreme, Including drilled engraved Bakelite panel, solid mahogany cabinet, and three No. 201-A d» Q (\ All goods absolutely guaranteed by manufacturer and ourselves. Shipped immediately, prepaid, on receipt of purchase price. Write for price list on our complete line of quality apparatus. RADIO & MECHANICAL TRADING CORP. 23 Warren Street NEW YORK CITY put the wa\-e trap in shunt with the aerial and ground, in series with the aerial, in series with the ground, or cut it out entirely? I worked for two hours trying to figure out this problem on a series parallel switch but could not solve it. Can you tell me the right size loop to use on this circuit? I have a loop which I bought; it brings in the wave but I find I cannot split it; so I have not as yet been able to use the loop. Of all the circuits I have tried, I find this to be the best for all around work. Its selectivity is remarkable and the range is fine. A. — Noting limitations encountered in the operation of Circuit 01321, Radio Digest, we advise that it should be capable of tuning to lower wave lengths as constructed. However, in experimentation 3-ou might eliminate the variometer shown between the audio frequency transformer and the rotor of coupler for low wave length work. For accomplishment of higher wave lengths place a .00025 mfd. fixed condenser between the grid variometer, grid condenser connection and the filament side of the variocoupler or ground. A wave trap is most effective in the antenna circuit; we recommend it in that position only. It is doubtful if your proposed arrangement could be effected. A loop may be constructed of 10 turns of wire spaced at % inch on a 3-foot square frame. <JlTvnst oftheWris ITS SET TflLLOWTIP MICROMETER ADJUSTING CRYSTAL DETECTOR The every-purpese detector — fixed or changeable adjustment, ju t as you wish. Tune with the YELL0WT1P. No hunting or looking for a sensitive spot. Just "A Twist of the Wrist— It's Set." Micrometer adjustment in a moment, fixed indefinitely. Ideal for reflex and other circuits. Write for folder and name of your nearest dealer. 2 WHOLESALE RADIO EQUIPMENT CO. Exclusive Factory Representatives 35 WILLIAM ST., NEWARK, N. J. Dealers and Jobbers write for attractive proposition. liiiiiiiiiiiiiiiiiiMiiiiiiiiiiiiiiiiiiiMiiiniiiiiiiiiiiiiiiiiiiiiiiiiiEiiiiiiiiiiiiiiiniiiiniiiiiiiifl "*A*E Perfection I2i£5 Selection" Neutrodyne 5 TUBE SET The Neutrodyne Circuit is the last word in Radio and is the best set that can be made today. Formica Panel 7x24 5 Bakelite Sockets 3 Neutroformers 2 Neutrodons 2 Franco Audio Transformers 1 "A" Battery Switch 3 Dials, 4 inch 1 Klosner Rheostat 1 Amsco Power Rheostat 8 Binding Posts with Names 3 Jacks 27 Feet Spaghetti 28 Feet No. 14 Tinned Copper Wire 2 Condensers, .006 Dubilier 1 Grid Leak and Condenser, Freshman 1 Dubilier Condenser, .002 Special price for complete parts for 5 tube set Coekaday Circuit Complete 1 Eastern Coekaday Coil 2 Amsco 23 Plate Vernier Condensers 1 Panel 7xl4x-fV 2 Dials, 3 inch 1 Bakelite Socket 1 Tubular Leak, 2 meg. 1 Dubilier Condenser, .00025 1 Klosner Rheostat 8 Name Binding Posts 12 Feet Tinned Copper Wire No. 14 6 Feet Cambric Spaghetti 1 Switch Lever 7 Contact Points and Nuts 2 Contact Stops and Nuts 1 Diagram Our special price for complete Coekaday Set $1X95 13 Erla Reflex Circuit Complete Operate a loud speaker on one tube with this wonderful set. 1 Formica Panel Txllxft. Panel is drilled, engraved and polished. 1 Erla Reflex Transformer. 1 Pearlco Moulded Bakelite Coupler. 2 Switch levers. 1 Amsco 23 Plate Vernier Condenser. 1 Klosner Vernier Rheostat. 1 Crystal Detector with Crystal. 2 Bakelite Sockets. 1 Dial, 3 inch. 1 Improved .Tack. 1 Dubilier Condenser .001. 1 Dubilier Condenser .002. 1 Ella Bezel. 8 Name Binding Posts. 12 Ft. Tinned Copper Wire. No. 14. 6 Ft. Cambric Spaghetti. 12 Contact Points and nuts. 2 Contact Stops and nuts. 1 Franco Audio Transformer. Our Special Price Complete S 27^2 Perfection Radio Corporation 59 Cortland Street, New York City Six New Tork Retail Stores Add Parcel Post Do Not Send Stamps 208 page -complete Radio catalogue free with order of $5.00 on request. Otherwise prepaid for 25 cents. [tllllllllBlllIIIIIIIIIIIIllIIIIlllIlllllBlllllllllElllllIIIIIIIIltllllllllllllllllllllllllllllllllllllllll