US1567848A - Radiofrequency transmission system - Google Patents

Description

Dec. 29, 1925- 1,567,848

. L. L. KUMEILIKE RADI OFREQUENCY TRANSMI S SION SYSTEM Filed March 9, 1922 Dec. 29, 1925.

LORENZ LEI KUMEILIKE, OF NAPA, CALIFORNIA.

RADIOFREQUENCY TRANSMISSION SYSTEM.

Application field March 9, 1922.

To all whom it may concern:

Be it known that I, LORENZ LEI KUMEI- LIKE, resident of Napa, county of Napa, State of California, have invented certain new and useful Improvements, in Radiofrequency Transmission Systems, particularly a uniwave signalling system for are radio transmitters, of which the following is a specification.

The invention has for an objectto provide an improved and more efficient transmission system embodying an untuned intermediate circuit electro-magnetically coupled to the local oscillatory circuit and antenna circuit for the purpose of eliminating the arc mush and harmonics of the Poulson arc converter used in connection with said antenna circuit.

A further object of the invention is to provide a transmission system of this character having keyed circuits controlling the power and antenna circuits by which the power may be balanced and the antenna detuned when desirable Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the drawings, Figure 1 is a diagrammatic circuit arrangement by which the antenna circuit may be detuned; Figure 2 is a similar view of a modified form of such ar 'angeinent; and Figure 3'is a like view of a further modification thereof.

Referring to the form of circuit shown in Figure 1, the numeral 5 designates a source of electric energy, such as a direct current generator, which is converted at 8 into radio frequency energy by an arc in a hydrocarhon atmosphere and strong magnetic field supplied from 6. The are 8 oscillates through'the loading coil 9 and local capacitance 10 at a period depending upon the values thereof, and radio frequency energy is transferred to a tuned resonant antenna circuit 11, 12 and 13 by single loops 14c and 15 forming the untuned intermediate or Clll rent transforming circuit'which is provided with a signalling relay key at 1 and The direct current circuit may be provided with a reactance 7 and resistance 16 controlled by key contacts 3 and at which operate in synclu'onism with contacts -1 and 2 for power balancing elifect. The key circuit 3, l and r ance 6 in be disp rse in ether rele' Serial No. 542,434.

tion to the local oscillatory circuit for power balancing effect if desired.

When contacts 1 and 2 are closed uniwave energy is radiated by the antenna, but when contacts 1 and 2 are opened no energy is preferably used to choke the radio frequency current from hacking into the generator armature when it is desired to unground the arc by opening switch 17 to ground at 13. The local oscillatory circuit may employ a thermionic tube, as usual in this art. The power balance key at 3, 4 controls the resistance 16 in the negative side of the direct current source. In this manner power balance is elfected when the key is in non-signalling position. The use of the single loop intermediate circuit closely coupled at the low voltage end of the loading inductors of the local oscillatory circuit and the antenna circuit and having the relay key to interrupt and establish the flow of current provides for the minimum step down voltage transformation from the source and the inaximumtransfer of energy to the antenna circuit under resonant conditions between the source of oscillations and the antenna circuit. This closed oscillatory circuit producing continuous or undamped waves is excited intermittently at two different periods, viz: the signalling and non-signalling frequency. Oscillations are maintained locally at the non-signalling frequency, and as shown in Figures 2 and 3, this frequency has no effect on the antenna circuit in close proximity thereto, because of the antenna detuning key circuits provided. The circuit shown in Figure 1 provides for a key in the untuned intermediate circuit and a power balance key disposed in the local diroot current circuit so that the combinathm of these circuit-s produces improved and. most c iicient results.

In the circuit arrangement shown in Figure 2, when the contacts 1 and 2 are closed radio frequency energy is transferred from the local oscillatory circuit L as in Figure 1, t t e me res n nt circ L by single coupling loops 4 and 5 and uniwave energy is radiated from the antenna, While contact 3 controlling the antenna detuning loop 6 and resistor 7 is released thus opening this circuit. lVhen contacts 1 and 3 are closed the antenna circuit is detuned by the loop 6 and resistor 7 so that no energy is radiated by the antenna. It has been found that when the L/C ratios of the oscillatory circuit and the antenna circuit are equal and large the best effects are secured for minimum arc mush and harmonic interference. In the practical application of the form of circuit shown in Figure 2 the local oscillatory or direct current circuit is provided with a power balancing key as shown in Figure 1. It is important to detune the antenna circuit to prevent the radiation of energy from the antenna when the key in the intermediate circuit is in non-signalling position while oscillations are maintained in the local oscillatory circuit which provides for a uniwave system.

The form of circuits shown in Figure 3 differs from Figure 2 in the control key for the intermediate, antenna, and local oscillatory circuit, as the power balancing ef ect upon the latter is effected by the loop coupled to the loading coil of the local oscillatory circuit. In this preferred form of the invention the control of the several circuits is effected in combination by the intermediate circuit loops and key arrangement disclosed. When contacts 1 and 2 are closed and corn tact 3 released, radio frequency energy is transferred from the local oscillatory circuit to the tuned resonant antenna circuit by the coupling loops 4: and 5 and uniwave energy radiated from the antenna. When contacts 1 and 3 are closed and contact 2 released, the antenna circuit is detuned by the neutralizing effect of the differential loop 6 and no energy is radiated by the antenna.

The coupling loop 4 of the intermediate circuit is disposed at the low voltage end of the loading inductor in the local oscillatory circuit, thus making a closed loop circuit which can be adjusted to absorb power from the local oscillatory circuit equivalent to the power dissipated by the untuned loop circuit and antenna circuit. In this manner power balance is effected when the key is in non-signalling position, while oscillations are maintained in the local oscillatory circuit. This disposition of the coupling loop at the low voltage end of the loading inductor in the local oscillatory circuit reduces to a minimum the losses due to the use of a loop circuit and produces very efficient results.

The invention presents essential novelty in the keying of the intermediate circuit to produce signalling effect, together with power balancing and antenna detuning effects when the key is in non-signalling position. The successful operation of this uniwave system depends upon the proper cooperating functions of the signalling, an tenna detuning, and power balancing keys, which may be interchangeably used in the several circuit arrangements hereinbefore explained.

The circuits disclosed are diagrammatic applications of the invention which is not specifically confined thereto as changes and alterations may be made therein without departing from the spirit of the invention as recited in the following claims.

What I claim is- 1. In a radio frequency transmission system, a local oscillatory circuit, an antenna circuit, an intermediate untuned loop circuit coupled to the oscillatory and antenna circuits and provided with a signalling key, and power balance means cooperatingwith said oscillatory circuit. I

2. In a radio frequency transmission system, a local oscillatory circuit, an antenna circuit, an intermediate untuned circuit coupled to the oscillatory and antenna circuits and provided with a signalling key, power balance means cooperating with said oscillatory circuit, and means for detuning said antenna circuit.

3. In a radio frequency transmission system, a local oscillatory circuit, an antenna circuit, an intermediate untuned circuit coupled to the oscillatory and antenna circuits and provided with a signalling key, and a key for detuning said antenna circuit.

4-. In a radio frequency transmission system, a local oscillatory circuit, an antenna circuit, an intermediate untuned circuit coupled to the oscillatory and antenna circuits and provided with a signalling key, a key for detuning said antenna circuit, and power balancing the oscillatory circuit by the loading inductor thereof.

5. In a radio frequency transmission system, a local oscillatory circuit, an antenna circuit, a single loop circuit coupling the oscillatory and antenna circuits, and keying means in said loop circuit for signalling and also neutralizing and detuning the antenna circuit.

6. In a radio frequency transmission system, a local oscillatory circuit including a loading inductor, an antenna circuit, an intermediate circuit coupled to the oscillatory and antenna circuits and nrovided with a signalling key, and keyed loops from the intermediate circuit for detuning the antenna and power balancing the loading inductor.

In testimony whereof, I have hereunto set my hand at Napa, California, this 18th day of February, 1922.

LORENZ LEI KUMEILIKE.

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