US1404574A

US1404574A - Telephone and wireless-telegraphy installation

Info

Publication number: US1404574A
Application number: US230795A
Authority: US
Inventors: Brillouin Leon Nicolas
Original assignee: Individual
Current assignee: Individual
Priority date: 1918-04-25
Filing date: 1918-04-25
Publication date: 1922-01-24
Anticipated expiration: 1939-01-24

Description

L. N. BRILLOUIN. TEL EPHONE AND wmmss TELEGRAPHY"INSTALLATION.

v APPLICATION FILED APR. 25, I918. 1 ,4Q4,574 Patented Jan. 24, 1922.

2 SHEETS-SHEET I.

Z6 072/ @1372 Zza gvi L. N. BRILLOUIN. TELEPHONE AND WIIRELESS TELEGRAPHY INSTALLATION.

APPLICATION FILED APR-2521918- 'Patented Jan. 24, 1922.

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fivemior Z6070 (1612970 550 u an/ wzekse as arrange such installations so as v LEON NICOLAS BRILLOUIN, OFIARIS, FRANCE.

TELEPHONE AND WIRELESS-TELEGRAPHY INSTALLATION.

Specification of Letters Patent. Patented Jan 24 1922 Application filed April 25, 1918. Serial No. 230,795.

To all whom it may concern:

Be it known that I, LnoN NICOLAS BR L- LoUIN, citizen of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Telephone and Wireless-Telegraphy Installations, of which the following is a specification.

This invention relates to telephone and telegraph installations and more particularly b to wireless telegraphy, which form the sub- 'ect of the United States patent application lVo. 174,633 filed on the 13th June 1917 by Brillouin and Beauvais which mainly consists in inserting a condenser into each of the connections of the electrodes to each other, and using as an amplifier at the receiving stations of such installations, a number of audions or repeaters each comprising a filament heated by an electric current and two different electrodes, and in connecting the second electrode or plate of one audion b to the first electrode or grid of the next audion, and the first electrode or grid of the first a-udion to the line, in connecting moreover the second electrodes or plates of each audion by means of a resistance to one of the poles of a source of current.

The invention has for its main object to to avoid the production of internal resonance, and so as to ensure amplification of any waves which they receive, whatever be their length, with or without heterodyning. The heterodyning can occur when the receiving apparatus is almost synchronized for the lengths of external sustained waves to be received. Such external sustained waves then generate in the apparatus internal Waves which are almost synchronized with the external waves. The combined effects of the external wavesand the internal waves produce beats such as are produced in a heterodyne system. These beats are audible in'the telephone. The invention mainly consists in connecting, by means of a suitable capacity, the first electrode or the grid of the first audion of such installations to the second electrode or the plate of another suitably selected audion. The invention comprises other arrangements, more particularly referred to hereinafter.

In the accompanying drawing, by way of example:

Fig. 1 shows diagrammatically a wireless telegraphy receiving station arranged in accordance with a first method of carrying out the invention;

Fig. 2 shows diagrammatically a Wire'- less telegraphy receiving station arranged in accordance with a second method of carrying out the invention.

First of all, and in accordance withthe application hereinbefore referred to, a numerof audions a c a a, is taken each comprising a filament 10, 20, 30, 40, a first electrode or grid 100, 200, 300, 400 next to the filament and a second electrode or plate 1 2,013 4, separated from the filament by the gri v A source of electricity, for instance a battery b, is taken, intended to supply the current for heating the filaments 10, 20, 30, 40 of the audions a a a a, and the said filaments are connected to the terminals of the said source ofelectricity, the connection eing in parallel.

Another source of electricity 0 is provided, intended to give a tension V in the plates 1, 2, 3, 4. One of the terminals of the said source 0 is connected to the terminal of opposite sign of the sourceof electricity 6, and the plates 1, 2, 3, 4 are connected to the other pole of the said source of electricity 0, a resistance d d d being inserted between said other pole and each of the said plates, with the exception of that of the last audion.

One of the receiving terminals 6 of the installation which is adapted to be connected to any known form of radio receiver is connected to that pole of the source b, which is connected to the source 0, and the other re. ceiving terminal e ,'whichis adapted to be connected to the other terminal of the radio receiver, is connected to the grid 100 of the first audion, a condenser 7 being preferably inserted between the said termlnal and the said grid.

The plate 1 of the first audion is connected to the grid 200 of the second audion, a condenser f being inserted between the said plate and grid. Identical connections are made between the plates. and the grids of the next audions.

The resistance inserted between the plate 4: of the the last audion, and the source ofelectricity 0, is replaced by a telephone instrument g.

Each grid is then connected, by means of a resistance 7Z1, 7?, if, 72, either to the source of current I) or, still better, to a potentiometer j shunted acrossthe terminals of audion in accordance with the length of "a certain delay an a source of current It, one of the terminals of which is connected to one of the terminals, preferably to the positive terminal, of the'source of current Z).

Nevertheless, carev must be taken, when connecting such an installation, to avoid creation of any reaction capacity that acts on any other element than the grid of the first audion. It is therefore advisable not only to avoid any auxiliary connection that audion is then connected by means of a capacity- Z to a plate such as the plate 2, 3

or t or one of the following audions.

The capacity Z is preferably arranged, so that its value may be modified at will, and also so that it may beconnected, according to circumstances'to the plate of any one of the audions a, a a

It is necessary to point out that when the value of the capacity Z is increased, there is first produced an increase of the amplification, then heterodyning, and that by regulating the capacit Z regulation of the apparatus may be e ected in a very simple manner.

It is however impossible to select any audion, the plate of which is to be connected by the capacity Z to the grid 100 of the first audion. If the audion is wrongly selected, either heterodyning does not take place, or the heterod nmg takes place with (l suddenly and it is necessary subsequently to reduce'the value of the capacity Z considerably in order to ship the heterodyning.

n the contrary, if the audion is properly selected, the heterod ning takes place gradually and without do ay, and it .ceases to take place as soon as the capacity Z is brought to a value slightly below that for which the heterodyning began to take place.

For the choice of the audion, it must be pointed out that a given audion does not ensure heterodyning for wave lengths smaller than a given wave length, and that for wave lengths exceeding a given value, the heterodyning takes place suddenly and with a delay.

It is therefore necessary to choose the Wave to be received, bearing in mind'that' as the lengths of wave increase, it is necessary to take the audions in an order depending on their order number, and also on the telephone,

rename fact whether this order number is an even or an odd number.

It is advisable to choose suitably, on the one hand, the resistance h which connects the grid of the audion to the installation, the plate of which is connected by the capacity Z to the grid of the first andion,

to the plate of the last audion (a in the construction shown in Fig. 2}, and in addition are used the following arrangements;

Between vthe terminals of the telephone 9 which is inserted between theplate of the last audion and the positive pole of the high voltage source of electricity 0the said telephone may be moreover replaced either by the primary of a transformer, the secondary of which is connected to the or by any desired suitable measuring instrumentis inserted a capacity g and between the plate of the last au'dion and the telephone gor its substituteds inserted a resistance and a suitable self-inductance coil 9 In this way it-is possible to produce heterodyning for any desired lengths of sustained waves, from the smallest to the lar est.

preceding audions in the series, and a suitable capacity connecting the grid of the first audion to the plate of another audion of the series.

2. A wireless receiving system comprising receiver terminals, an amplifier embodying a series of audions each embodying a filament, a grid, and a plate, a circuit connecting the grid of the first audion to one of the receiver terminals, circuits connecting the grids of other audions to the respective plates of the preceding audions in the series, and a variable capacity connecting the grid of the first audion to the plate of another audion of the series.

3. A Wireless receiving system comprising receiver terminals, a series of audions each comprising a filament, a grid and a plate, a circuit connecting the grid of the first audion to one of the receiver terminals, circuits connecting the grids of the other audions to the respective plates of the preceding audionsin the series, and a suitable capacity adapted to connect the grid of the first audion to the plate of another audion of the series.

4. A wireless receiving system comprising receiver terminals, a series of audions each comprising a filament, a grid and a plate, a circuit connecting the grid of the first audion to one of the receiverterminals, circuits connecting the grids of the other audions to the respective plates of the preceding audions in the series, and a variable capacity connecting the grid of the first'audion to the plate of. another audion of the series, the latter audion being so selected that heterodyning takes place gradually and with delay and ceases when the capacity is reduced to a value slightly below that at which heterodyning commences.

5. A wlreless receiving system comprising receiver terminals, a series of audions each 1 comprising a filament, a grid, and a plate, a

circuit connecting the grid of the first audion -to-one of the receiver terminals, a source of current supply for the filaments of the audions,'another source of current supply of given voltage, resistances connecting the latter source of current supply to the-plates of the audions, va circuit connecting the grid of the first audion to one of the. receiver terminals, circuits connecting the grids of the other audions to the respective plates of the preceding audions in the series, and a suit- I audion to the receiver terminals, a series of audionseach able capacity connecting the grid of the first series.

6. A wireless recelvmg system comprising plate of another audion of the I embodying a filament, a grid, and a plate, a

. necting the grid of the first audion to a plate of another audion-of the series, the said resistance and the capacity being of such relative value that they will avoid reduction of amplification and will also prevent singing.

7. A wireless receiving system comprising receiver terminals, a series of audions each comprising a filament, a grid, and a plate, a source of current supply connected to the filaments of the audions, another source of current supply, resistances connecting the latter source of current supply to the grids of the audions, the grid of the first audion being connected to one of the receiver terminals, circuits connecting the grids of the other audions to the plates of the preceding audions in the series, a capacity connecting the grid of the first audion to the plate of the last audion in the series, and a telephone circuit connected to the plate of the last anclion, said telephone circuit containing a resistance and a self inductance coil in series with the telephone, and also containing a capacity which shunts the telephone.

In testimony whereof I have'hereunto set my hand in presence of two subscribing witnesses.

' V Witnesses:

CHAS. P. PREssLY, PAUL BLUM.