US1953002A

US1953002A - Radio device

Info

Publication number: US1953002A
Application number: US507951A
Authority: US
Inventors: Benjamin H Magoon
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-01-10
Filing date: 1931-01-10
Publication date: 1934-03-27
Anticipated expiration: 1951-03-27

Description

B. H. MAGOON RADIO DEVICE March 27, 1934.

Filed Jan. 10, 1931 (I v' V Patented Mar. 27, 1934 UNETED STATES PATENT OFFECE RADIO DEVICE 2 Claims.

This invention relates to a radio device, the general object of the invention being to provide means for eliminating static and other electrical interferences to a great extent and to control the radio wave and hold back foreign signals.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinaiter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawing which shows diagrammatically the invention applied to a radio device.

In this drawing, the numeral 1 indicates a binding post to which the antenna wire 2 is connected, and the numeral 3 indicates a conductor leading from the post to the terminal 4 of a switch arm 5. This arm is adapted to be moved into contact with any one of the terminals 6, 7, 8 and 9. The terminal 7 is connected by the conductors 10 to the radio device which is shown generally at A. Two sets of coils, shown at B and 0, form part of the invention, each set comprising a pair of coils, the coil 11 of each set being wound over the other coil 12 of the set, the ends of the wire of each coil being capacitively coupled, as shown at 13. The coil 12 of the set E is connected with the post 1 and the coil 12 of set C is. connected with the conductor 10. Coil ll of the set B is connected by the conductors 14 with the post or terminal 9 and the coil 11 of the set C is connected by the conductors 15 with the terminal 8.

A blocking condenser 16 is connected with the conductors l4 and 15 and a variable resistance 17 is placed in a conductor 15 between the coil 11 of the set C and the condenser.

This invention, through its inductive coupled coils, blocking condenser and variable resistance, will, eliminate a great amount of static and other electrical interferences, thus controlling the radio waves and holding back foreign signals.

When the switch arm is contacting the post 6, the radio waves will pass through all working parts of the circuit and when switched to post 7, the antenna is connected directly to the radio set and when this is done, the invention absorbs a large percentage of interference and static. When the arm is in contact with the post 8, the waves will pass through the variable resistance and the output coil, the other coil absorbing interference, and when the arm is in engagement with the post 9, the blocking condenser is brought into the circuits. The coils should be from one to three or more inches long and from one-fourth to one inch in diameter. They should be made as small as possible in order to keep the size of the unit as small as possible. The coils are preferably wound with from twenty to seventy-five or more turns of double cotton covered or silk covered wire, the size of wire dependin upon the size of the tubing used to make the same. The coil 12 of set E is first wound upon the tubing and the open or free end of the wire is brought back and capacitively coupled to the other end of coil, as shown at 13. Then the coil 11 of the same set is wound over the first coil and is composed of the same number of turns of wire of the same size and kind of wire as the first coil with the open end of this second coil capacitively coupled to the other end of the coil. This completes the first inductively coupled input coil. The set C or output coil is constructed in the same manner.

All the parts may be mounted upon a panel of mica, bakelite or the like and when built in a radio device, should be properly shielded.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts, provided that such changes fall Within the scope of the appended claims.

What I claim is:

1. In combination with the antenna and input terminal of a radio receiver, two pairs of inductances, the inductances of the respective pairs being inductively coupled, one terminal of one inductance of one pair being connected with the antenna and one terminal of one inductance of the other pair being connected with the input terminal, the ends of each inductance of each-pair being capacitively connected, and one terminal of the remaining inductance of one pair being connected through a blocking condenser and a variable resistance with one terminal of the remaining inductance of the other pair.

2. In combination with the antenna and input terminal of a radio receiver, a pair of concentric inductances one of which has one terminal connected with said antenna, a second pair of concentric inductances one of which has one terminal connected with said input terminal of the receiver, the remaining inductances of both pairs being connected with each other through a blocking condenser and a variable resistancaeach of said inductances being open and having its terminals capacitively coupled.

BENJAMIN H. MAGOON.