US1224499A - Radio telegraphy and telephony receiver. - Google Patents

Description

G. W. PICKARD.

RADIO TELEGRAPHY AND TELEPHONY RECEIVER.

APPLICATION FILED APR. 17. 1914. RENEWED MAR. 13. 1911.

1,224,499., Patented Ma l, 1917.

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vG. W. PICKARD.

RADIO TELEGRAPHY AND TELEPHONY RECEIVER.

APPLICATION FILED APR. 17, 1914. RENEWED 1111111. 13.1911.

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1 5 X51 ,Bf 6 Em IWWMWW WWWHME [WW 1 J .K 6 6 W 1 DWWDHHHW )WHWWHHHW 1E HWWWW) MWWWMW 6 5 Inventor: 'feka hzLi'htr Pick 63 GREENLEAF WHITTIER PICKARD, 0F AMESBURY, MASSACHUSETTS, ASSIGNOR TO WIRELESS SPECIALTY APPARATUS COMPANY, OF BOSTON, MASSACHUSETTS, A.

CORPORATION OF NEW YORK.

RADIO TELEGRAPHY AND TELEPHONY RECEIVER.

Application filed April 17, 1914, Serial No. 832,591. Renewed March 13, 1917, Serial No. 154,560.

to be the best of the various forms in which.

the principles of the bodied.

This invention relates to improvements in receiving apparatus for radio telegraphy and telephony, and consists of the apparatus and arrangements thereof disclosed herein, the object of the invention being to provide simplified and more efiicient'apparatus.

Of the drawings, which are largely diagrammatic, Figure 1 shows an arrangement wherein the second coil C has only one side invention may be em connected to the receiving apparatus D, T,

which may be grounded, as shown; Fig. 2 shows a like arrangement, save that the coupling between antenna A and coil B is made inductively, by way of coil B instead of directly'and conductively as in Fig. 1; Fig.

Fig. l chiefly in the inductive coupling rep-' 3 shows an arrangement similar to that of Fig. 1, save that instead .of one coil B as in Fig.1, two coils B and B are employed, so wound and connected that their corresponding ends are of opposite polarity, as indicated by the signs at their left ends; Fig. t shows an arrangement similar to Figs. 3 and 1, save that the coupling between. antenna A and coils B and B is made inductively, by way of coils B and B as in the case of B Fig. 2; Figs. 5 and 6 show modifications of the arrangement of Fig. 3, that of Fig. 5 being a direct or conductive antenna coupling and that of Fig. 6 being an inductive coupling by way of coil B and Fig. 7 is a modification involving the combination of an adjustable conducting bridge E connecting coils B and B In each of the figures, A represents any ordinary or suitable antenna or aerial, G a. ound connection or a suitable substitute or equivalent thereof, '1 a suitable indicator as an ordinary electromagnetic telephone re- Specification of Letters Patent.

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Patented May 1, 19317..

ceiver, and D a suitable detector, as one of the crystal rectifier or gas rectifier types. Also K represents any suitable electrical condenser, the arrow indicating adjustability of the capacity thereof. In all the figures, the .double arrows indicate variability of coupling between the coils shown adjacent to such arrows; and the single arrows at the ends of leads indicate adjustability of the 'inductances at which the arrows are directed.

In Fig. 1. coil B is a coil of suflicient length to cause its natural period to be equal to the shortest desired wave-length. As shown, only a small portion of this coil is included in the connection A G, and this is variable as. shown, to permit adjustment of said connection AG to theperiodicity of the waves from the distant. transmitter. .The coil C is adapted to slide inside'coil B as shown (or outside), and consists of only a few turns of coarse or flat wire, its natural period being much smaller than the shortest desired wave-length. lhe variation of coupling between coils B and G causes a variation of the natural period of the left hand part of coil B which is not included in the connection A-G. V

The arrangement of Fig. 2 difiers from resented as-by Way of coil B In this'case, however, the tuning of the connection A-Gr to the waves is efl'ected by the operation of adjustable condenser K. 7 The arrangement of Fig. 3, comprises, in addition to the parts described above, two coils C,'C -instead of the single coil C of Fig. 1, each of the pair cooperating with its corresponding coil B, B the detector D being connected between the left hand ends of coils C, C. By the coupling adjustments indicated by the double arrows,,the natural period of the system B,-B C, C may be made to correspond to any desired wavelength. An adjustable connection A is provided for the second coil B, so that it,

as well as coil B, may be varied as to their above stated, the two coils B, B have their right hand ends connected by a lead A the coils B and B 1 providing the inductive coupling with coils B and B As in the other figures, the left hand ends of coil B,

, the inductive coupling is employed.

obyway of condensers K and K respectively.

B are open circuited, as are the right hand ends, adjacent to them, of the coils C, C.

In Fig. 5, the long coil B, B has a few turns at or about the center connected, by

way of the variable connections, in the connection AG. Observe the positive and negative signs. in Figs. 3 and 4 were placed back to back, in respect of their right hand ends. Coils C, C are arranged, as in Figs. 3 and 4, one" adjacent to a positive end of the long coil, and the other adjacent to the negative end. The arrangement of Fig. 6 is like that of Fig. 5, save that the inductive coupling is employed, by way ,of coil-B as in Fig. 4, and the connection AG is tuned by variable condenser K as i n'FigsQ and 4 where In the-arrangement of Fig. 7 the long coils B B are connected to antenna coil.

B in any suitable way, as electrostatically Coils C, C and intermediates D, 'I are arranged, as before, at the free or open ends of coils B, B respectively. 'The proper adjustments are obtained here not only by varying the coupling between C, C and B B but by the movement to leftor right of the conductin bridgeindicated at E which connects coils 1 and B to form a potential node. j

The arrangements ofFigs. 2-7 inclusive embody all desired or necessary features of the arrangement of Fig. 1 as described and shown. K

This is as if coils B, B

and the coils being bodily. movable with reference to one another; the second coilv having unilaterally connected to it suitable means for indicating the received intelligence, substantially as and for the purpose described.

2. In' a radio receiving system, the combination with two coils, of sufiicient length to "permit the natural period thereof to be substantially equal to the shortest desired wave length, of a second pair of coils, consisting of a few turns and having a natural period much smaller'than the shortest desired wave-length, each pair of coils being open-circuited, and the first pair of coils being so wound and connected that their free ends are of opposite polarity; the second pair of coils being arranged in cooperative relation with the first pair and being movable relative thereto and having unilaterally connected to them suitable means for indicating the received intelligence, substantially as and for the purpose described.

@ GREEN LEAF WHITTIER PICKARD.

In presence'of .M. C. HANNoN, W. J. BARKLEY.

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