US1238869A

US1238869A - Valve-receiver for wireless signals.

Info

Publication number: US1238869A
Application number: US15457917A
Authority: US
Inventors: George Maurice Wright
Original assignee: Marconi Wireless Telegraph Co America
Current assignee: Marconi Wireless Telegraph Co America
Priority date: 1917-03-13
Filing date: 1917-03-13
Publication date: 1917-09-04
Anticipated expiration: 1934-09-04

Description

G. M. WRIGHT.

1 VALVE RECEIVER FOR WIRELESS SIGNALS.

APPLICATION man MAR. 13. I917.

Patented Sept. 4, 1917.

"1 ears ,as

' GEORGE MAURICE WRIGHT, LONDON, ENGLAND, ASSIGNOR T MAECONI WIRELESS TELEGRAPH COMPANY OF AMERICA, 01 NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

VALVE-RECEIVER EOE WIRELESS SIGNALS.

Specification of Letters Patent.

Patented dept. 45:, 1 .91 "3.

Application filed. March 13, 191-7. Serial No. 154,579.

To all whom it may concern:

Be it known that I, GEORGE MAunlcn- WRIGHT, a subject of the King of Great Britain, and resident of Marconi House, Strand, London, England, have invented a new and useful Improvement in Valve-Receivers for Wireless Signals, of which the following is a specification.

This invention relates to receivers of wire less slgnals which comprise a vacuous vessel containing a heated filament, a grid and an anode.

According to this invention I employ two gridsbetween the filament and the anode. By this means I am enabled to limit the strength-0f the current in the anode circuit.

One important result. of this will'bethat the sounds caused by atmospherics in a telephone will be reduced and will thus be prevented fromoverpowering the sounds caused by the signals which it is desired to detect.

My invention is'illustrated by the accompanying drawings, Figure l of which is. a diagram of the circuits of a receiver for wireless signals. Fig. 2 shows the construc tion of the vacuum tube with the ,fine and coarse mesh screens located between the filament and anode.

- as to enable the coupling to be varied. be-' In Figs. 1 and 2 a is a vacuous tube in closing a filament o heated by. a battery 0, a

. grid d, a second grid D and an anode e. In

Fig. 2 an inductance f shunted by a condenser g is connected to the outer grid 1) and to the inner grid (1 through a resistance It across a battery C and is coupled to an aerial z". A second inductance 7c shunted by a-condenser Z is connected to the anode e and through avhigh tension battery m to the inner grid 0? and is coupled to a receiver 12.. A coil 0 in the system f g is so positioned tween the oscillatory circuit f g and the oscillatory circuit k l. The coilo in the .position shown in Fig. 1 does not permit signals, -no matter" how strong, to get through unless the filament is incandescent.- Without this arrangement, signals would'rnanage to geti-through the vacuous tube, owing to the natural capacity of the tube, the leads, etc. A fixed potential is maintained between the grid d and the'filament by means of a po-' tentiometerpa The grid (2 should be of'fine mesh-and 1.. A vacuous tube containing a heated filament, a grid of coarse mes a second grid of fine mesh disposed between the first mentioned grid and the filament, an anode, an oscillatorycircuit connected to the filament and the coarse mesh. grid, and'a second oscillatory circuit connected to the fine mesh grid and to the anode.

' 2. A vacuous tube containing a heated filament, a grid of coarse mesh, a second grid of 'fine mesh disposed between the first mentioned grid and the filament, an anode, an oscillatory circuit connected to the filament and the coarse mesh grid,'andasecondosc1llatory circuit containing a high potential battery, connected to the fine mesh grid and to the anode. V i

3. y A vacuous tube containing a heated filament, a grid of coarse mesh, a second grld of fine mesh disposed between the first mentioned grid and the filament, an anode, an oscillatory circuit connected to the filament and the coarse mesh grid, and a second oscillatory circuit containing a high potential battery, connected to the fine mesh grid and to the anode, the two circuits-being inductively coupled exterior of said tube.

4:. A vacuous tube containing a heated filament, a grid of coarse mesh,a second grld of fine mesh-disposed between the first mentioned gridand the filament, an anode, an

oscillatory 'circuit connected to the filament and the coarse mesh grid, and a second osc1l-' latory circuit containing a high potential battery, connected to the fine mesh grid and to the anode, the two circuits being inductively coupled exterior of said tube, and

electrically connected to each other through a battery shunted by a resistance.

In testimony that I lann the foregoing my invention, I have signed my name this 16th day of February 1917. V anon E ion re.