Radio age (May 1922-Dec 1923)

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RADIO AGE— "THE MAGAZINE OP THE HOUR" 41 Building the Haynes DX Receiver ( Continued from page 6) battery, but it must be remembered that for loud reception, the large tubes must be used. The plate battery should be of the 22 1-2 volt, adjustable type so that just the proper voltage for the particular tube used may be obtained. Figure 1 shows the general layout for the panel. This shows a fixed grid leak, supported by the wires which connect to it, but as before mentioned, the variable arrangement is better and when used should be mounted on the panel, or in the same way as shown in the drawing. As it is never changed after once being adjusted to the tube used, it will perhaps be just as well to mount it as shown. Figure 2 is the skeleton circuit showing the conventional idea of wiring. The method of winding the bank-wound coil is shown in Figure 3. Some of our readers will no doubt wish to add two steps of audio frequency amplification to the set, so this has been shown in Figure 4. The rheostat shown in Figure 1 is the carbon type, but this is not necessary, as any standard type will answer just as well, although the resistance of it will depend upon the type of tube used. For the large 200 or 300 tubes, this resistance should be about 6 1-2 ohms, but if the WD-11 tubes are used, a rheostat haying 25 ohms resistance will be required. List of Material One cabinet to fit 7x10 inch panel. One bakelite panel, 7x10 inches, 3-16 of an inch thick. One bank-wound variocoupler. One switch lever. Four switch contact points. Two switch stops. Eight binding posts. One variable vernier U-plate condenser. Two dials. (Standard bakelite.) One rheostat. One socket (To fit the particular tube used.) One variable grid leak. One mica grid condenser .00025. Thirty feet No. 14 tinned copper wire. In selecting the socket, be sure to obtain one which can be mounted on the panel, as shown in Figure 1. The above list covers the parts necessary for the construction of the set only. The accessories which will also be required are as follows: One detector tube. One set of "B" batteries (22 1-2 volts adjustable). One pair of good headphones. One storage battery, or dry cell (depending upon the tube used). In wiring this set, be very careful to solder all connections and if flux is used, clean off the soldered joints with alcohol after completion. conditions of the Telegraph administration, and the selling firms must declare their readiness to pay the government a certain proportion of the profits of each sale. German Restrictions Recognizing that radio telephony in Germany has now become an important economic institution, valuable as an agent of communication with foreign countries and within Germany itself, the Federal Ministry of Posts and Telegraphs, which has hitherto exercised a restrictive monopolistic control over all wireless operations, is contemplating an early relaxation of existing restrictions for the benefit of the general public, Consul Richardson reports from Berlin. Broadcasting has been meagre in Germany. The "Eildienst Gesellschaft" at Berlin has been disseminating financial and commercial news to a clientele of subscribers. The company secured a lease from the government of the wireless station at Koenigswusterhausen in the province of Brandenburg whence it distributes bulletins received periodically from the higher power installation at Nauen. This was a strictly business proposition; the general broadcasting of music, lectures, information and features prominent among radio activities in the United States and elsewhere, has never been done in Germany. A club, comprising principally amateurs interested in wireless, was formed in Berlin in the early months of this year. One of its declared objects was to induce the government to sanction the free installation of private receiving sets ahd encourage radio progress. Apparently good results have followed the club's efforts. It is now understood that a public organization will combine and circulate a program of political, scientific and popular lectures of all sort, as well as music, etc. The federal telegraph administration will probably establish a number of sending stations. Any individual who secures a permit at his postoffice will be authorized to receive this service. The permit, which may be had at a small annual fee, will entitle the holder to use a receiver. Unauthorized "listening in" will be considered an offense against the Post and Telegraph regulations and will be punishable. Receiving apparatus will be procurable by license holders at specially designated shops. Manufacturers are to be allowed to deliver receiving sets only to such persons as possess the required permits. The sets must correspond with all the technical Overcomes Body Capacity Gives micrometric adjustment outside the field of inductivity. Testpd and approved by amateurs and expert*. Enables^ you to tune distant stations easier and more clearly. Simple as A B C. Installed from outside, no dismantling of your set necessary. Audibility made more natural or less distorted by the final adjustments obtained. One Hunt'g Device handles all dials on set several sets. Costs only one dollar on guarantee of money refunded If not satisfied. Ask your dealer or order direct from HUNT COMPANY 485 Shrine BIdg., Memphis, Tenn. STslSti PRICES REDUCED Send card today asking for our complete list of knocked down outfits and radio parts at reduced p.-ices. Our book "Radio Construction for the Amateur" will prove a big help to you. Price only fifty cents. A sample saving follows. You may order any part or parts you desire. Complete Regenerative Vacuum Tube Receiver. Approximate range 1,000 miles. Our Price Otherw Panel 7"il2" already drilled S 1.76 S 2.50 Cabinet k. d of .3 ply wood to fit 1.50 2.50 2 tlireo inoli dials at 30c each 60 1.00 IG switch points with nut at .01c 16 .48 4 switch stops with nut at .01c 04 .12 8 IjindinK posts, nickel plated at .03o .24 .48 2 switch lovers with ;>i" radius at .25c .50 .80 1 filiincQt rheostat. Good grade 50 1.00 1 180° vario-couplor — 16 taps 2.75 3.50 1 23 plate variable condenser 1.75 2.80 1 tube socket of high quality 45 .75 1 phone and 1 Krid condenser at .15o .30 .50 1 act transf era for marking panel 20 .30 9 feet spaghetti tubing at .040 .36 .64 1 tube socket support 20 .30 20 feet soft copper connecting wire 20 .30 1 1 copy "Radio Construction for the Amateur" .60 .50 $11.95 S18.32 Some other articles from our list are: — Frost head set — 2000 ohms S 3.45 $ 4.00 Transformer — Audio frequency •■Rhamstino" 3.00 4.00 Detector tube — 6 volt — "Independent" 2.96 4.00 Two step amplifier parts complete. . . . 13.95 21.50 What Thoy Say A great many unsolicited testimonials with reference to the above k. d. outfit have been received. A couple are: Roxbury, Connecticut. Am getting excellent service from one tube single circuit receiver which was bought knocked down from you. Have heard ninetyfour stations including PWX at Havana, Cuba and my friends think it is great. John S. Robinson.^ Covington, Tennessee. The set which we made from yoiir parts is giving good satisfaction. We have heard 1,500 miles or more air line. Have heard KLZ, KWII, KH.J, the last two being in Los Angeles, C.'i I i fornia. C. H. Owen Radio Parts Manufacturing Company 1Z47 Marlborough Dept. "C" Detroit, Michigan