US1735152A - Means for energizing radio apparatus - Google Patents

Description

MEANS FOR ENERGIZING RADIO'APPARATUS Filed Sept. 7, 1928 2 Sheets-Sheet 1 INVENTOR (ORNEUS 50L BY tomzus HJMOREL .AT RNEY Nv. 12, i929.

c. BOL ET AL MEANS FOR ENERGIZING RADIO APPARATUS Filed Sept. '7. 1928 2 Sheets-Sheet 2 INVENTOR commas BOL coaueus MOREL 9w Jaum TORNEY Patented Nov. 12, 1929 UNITED STATES PATENT OFFICE I I CORNELIS BOL AND CORNELIS HENDRIX MOREL, OF EINDHOVEN, NETHERLANDS, AS-

SIGNORS T0 RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE MEANS FOR ENERGIZING RADIO APPARATUS Application filed September 7, 1928, Serial Noam 1,542, and in the Netherlands September 3, 1927.

An application for this invention has been filed in the Netherlands, September 3, 1927.

This invention relates to wireless receiving sets and has for its purpose to so construct them that they can be easily adapted, at will, for continuous current or for alternating current feeding of the incandescent cathodes of the discharge tubes.

According to the invention, for this purpose the set has mounted on or in it a row of contacts some of which are connected to supply leads of the sources of current while other ones are connected to points of the circuit-arrangement proper which have to be fed by the said sources. Optionally, these contacts may be mutually connected in groups by straps or again they may be connected to corresponding contacts of a small box arranged or adapted to be arranged within or against the set and containing a transformer, a rectifier with smoothing device and a po tentiometer, the arrangement being such that in the first mentioned case the set is adapted for continuous current feeding and in the second case for alternating current feeding, in which latter case the required negative potentials may be derived from the potentiometer.

According to the invention, in the second case the box supplying the negative potentials when alternating current is used is given about the same dimensions as those of the grid biasing battery which must be used when the filaments are fed by continuous current.

The invention will be more clearly understood by referring to the accompanying drawings which represent, by way of example, an embodiment of the invention. In the drawings- Figure 1 shows a diagram of connections of a set according to the invention.

Figures 2 and 3 are views of a set according to the invention, in which only those parts are shown which are essential for the right comprehension of the invention.

In Figure 1, the parts belonging to the re ceiving set proper are separated by a dotted line from the auxiliary apparatus which is adapted to supply the heating current and the negative bias from an alternating current mains, the first-mentioned parts being indicated by O and the latter parts byW.

The various parts of the receiving set, which are indicated in the diagram in the usual manner, will not be described in detail. The different points of the circuit-arrange- I ment 'which have to be connected to the sources of current, are connectedto contacts 2, 3, 4-, 5, 7, 8, 11 and 13. In thecase of continuous current feeding of the set, a dry or other battery V for the supply of the required negative bias may be mounted between terminals 14 and 15.

Bymeans of external leads for continuous current feeding the terminals 1 and9 are connected respectively to the positive and negative poles ofa storage-battery B, the terminal 12 being earthed.

With continued current feeding,there are provided three straps B B B which respectively establish the mutual connection of theterminalsl, 2, 3, the terminals 4, 5, 6 and the terminals 9, 10 and 11. As will be obviou's by an inspection of the drawings estab lishing the above connections will complete circuits to energize the filament of tubes 40, 41, and 42 as follows: The filament ofthe tube 40 will be connected in parallel with the battery B through circuit A+, 1, 2, r, the

filament of 40, 4, 6, 1 0, 9and A. Thefilament of 41 is put directly in parallel with B through the circuit A+, 1, 3, the filament of a 41, 5,6, 10 and A-, while the filament of 42 is connected in parallel with B through A+2,

the filament of 42, 11, 9 and A. The purpose of resitsance'r is to apply the correct voltageto the filament ofradio frequency amplifier 40. The proper grid biasing potentials for the detector 41 is obtained by connecting the grid of 41 to the movable contact of potentiometer P connected across the filament heating circuit. If one wants to feed the set exclusively with alternating current, the three straps B B B are removed and the terminals 1-9 and also the terminal 14 of the set are connected to terminals 1 to 9 inclusive and 35 respectively of the apparatus WV which last mentionedterminals are shown in the drawings opposite to the which are connected to the terminals 1 and 9 are connected directly to terminals 1 and 9 of the mains leading to the alternating current source at the left of Figure 1, instead of being connected to the storage-battery B. This connection puts the primary winding 20 of a transformer in parallel with the alternating current source. This transformer has three secondary windings 21, 22 and 23. The winding 21 supplies current to a circuit which comprises a rectifier 24, smoothing condensers 29, 30, 31 and 32 and imp-edances in the form of ohmic resistances 25, 26, 27 and 28. A lead connects the end of the resistances 28 to a terminal 33 which is connected to the terminal 1%, in which case the dry battery V for the supply of the grid bias can be dispensed with.

The transformer winding 22 which is provided with a middle-branching, supplies the heating current to the cathode of the rectifier 2e and to the cathodes of the high-frequency valve and the final valve of the receiving set. The transformer winding 23 furnishes the heating current for the detector which, in contradis'tinction to the two other valves, is indirectly heated and which therefore must be fed as a rule with another tension.

Figures 2 and 3 show two views of the same. set, in Figure 2 alternating current feeding and in Figure 3 continuous current feeding being utilized. 7

Of this set the drawing only represents a high-frequency valve 40, a detector-valve 421 and a final'valve 42 and, in addition, a lowfrequency transformer 43 and in the one case the apparatus TV with the connection-contacts and in the other case the grid biasing battery V.

As shown in Figure 2 the various contacts 1, 2, 3, etc. of the receiving set are connected for the greater part to opposite cont cts of the apparatus W whereas in Figure 3 the various contacts of the set are connected, in groups, by the three straps B B B The apparatus WV is given such a shape that, inclusive of the rectifying valve G, it has substantially the same dimensions as the grid biasing battery V and consequently can easily be mounted instead of the latter.

lVhat we claim is:

1. In radio apparatus to be used with radio receivers having thermionic tubes and filaments therein adapted to be energized by direct current or by alternating current, a plurality of contacts each associated with one or more "of the electrodes to be heated, means for connecting together groups of said contacts when applying direct current to said electrodes, means for supplying biasing voltages to the control electrodes of said tubes when the filaments thereof are energized by direct current comprising a separate source of po tential, means for connecting an alternating current source to the filaments of said tubes when the direct current source is disconnected therefrom and means for supplying biasing potentials to the control electrodes of said tubes when the filaments thereof are energized by alternating current comprising a rectifier adapted to be fed by alternating current.

2. The combination of a radio receiver including thermionic tubes, direct current sources therefor including a separate grid biasing source, an alternating current source therefor, means for connecting either of said sources in parallel with the filaments of said tubes and means adapted to replace said separate grid biasing source when the alternating current source is connected to said receiver, comprising a rectifier energized from an alternating current source.

3. The combination of a radio receiver, including thermionic tubes, direct current sources therefor including a separate grid biasing source, an alternating current source therefor, means for connecting either of said sources to the filaments of said tubes and means to provide a grid bias'p'otential for the grids of said tubes whenthe alternating current source is connected to the receiver, comprising a thermionic rectifier energized from an alternating current source.

CORNELIS BOL. CORNELIS HENDRIK MOE-EL.

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