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76
Radio Broadcast
FIG. 5
Front view of set using manufactured coils. The has plenty of leeway in building his own set
connecting its primary both ways to see which works right. In connecting windings N and P, first connect the outside lead of one to the inside lead of the other. Be sure not to simply connect the outside lead of one to its own inner lead.
The neutralizing capacity, C, is easily made by leaving two inches of bus bar projecting from the grid terminal of the 201 -A tube. This is covered with spaghetti. A brass tube connected to the free end of winding N is then slipped over the spaghetti, fitting snugly. (Bare wire wrapped tightly around the spaghetti will do instead of the tube.)
See the article in the April RADIO BROADCAST for directions for adjusting the capacity C, and for the theory of the operation of the set.
THE SET WITH PURCHASED COILS
THE set using the Turney coils was built on a 2 1 -inch panel to make it less crowded. The baseboard, however, is only 16 inches
experimenter of this type
long. Coils A and S are mounted 2 inches from the panel and parallel to it. The circuit is the same as in the other case, although the wiring is slightly altered to suit the different arrangement of parts.
In both sets, General Radio .0005 mfd. condensers with slow motion gearing are used. The rheostat is 6 ohms. The 201 -A socket is a Paragon, while for the 199 tube, either Paragon, General Radio, or Radio Corporation sockets are recommended. Binding posts, contact points and panel, can be got at the five and ten cent store.
To get an idea of what performance to expect, the following is of interest: WGY is received quite satisfactorily on the loud speaker in Princeton, N. J. at any time of day, and KDKA can be heard faintly. At night KHJ is barely audible on the loud speaker, while KGO is almost loud, and can be separated perfectly from WLW, whose wavelength is only i per cent, different. (The respective settings of these two stations on the set using the home made coils are 23 and 22|.)
The original set described in the April RADIO BROADCAST is now being used by Dr. L. A. Turner of the Dept. of Physics, Princeton University, who has heard KGO on the loud speaker, using an indoor antenna!
What Our Readers Write Us
Wiib the Broadcast Listener in Samoa
A^ONG with this extraordinarily interesting letter from Mr. Roberts came several copies of a twenty-page radio bulletin which the enthusiastic listeners of Samoa issue "every once in a while" under the direction of Mr. Roberts who types the thing. We regret we haven't space for it. However, the transatlantic tests which RADIO BROADCAST sponsored last
November were by no means unsuccessful, as the flood of letters we received demonstrated conclusively.
Consulate at Apia, Samoa, January 21, 1924 Editor, RADIO BROADCAST, Doubleday, Page and Co.,
Garden City, L. I. DEAR SIR:
I have read in the January issue of RADIO BROADCAST an account of the transatlantic broadcasting tests. It ap