USRE15040E - Station - Google Patents

Description

I FffE/V/NG SET C. S. FRANKLIN.

AERIAL CQNDUCTOR FOR WIRELESS TELEGRAPHY.

APPLICATION FILED JULYZB; 1920.

Reissued Feb. 15, 1921. 15,040.

2 SHEETS$HEET I.

AWACLNT TRANSMITTING STAT/0N his M c..s. FRANKLIN.

AERIAL CONDUCTOR FOR WIRELESS TELEGRAPHY- APPLICATION FILED JULY 23, 1920.

2 SHEETS-SHEET 2.

Reisued Feb. 15, 1921.

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CHARLES s. FRANKLIN, or LONDON, E N LAND, Ass oNoR, Br MESNE ASSIGNMENTS, 'ro RADIO CORPORATION or AMERICA, a CORPORATION or DELAWARE.

i' AIiR a'nio'oNiJncToR ron wrnnnnss TELEGRAPHY.

f S pe cification of Reissued'Letters Patent. Reissued F b 15 1921 Original No. 1,322,101, datedNovember 18, 1919, Serial No. 82,042,. filed March 4, i916. Application for reissue filed July 23, 1920. Serial N6. 398,539.

DIVISION A.

Britain, residing at Marconi House, Strand,

London, England, have invented new and useful Improvements in or connected'with -Aerial Conductors for Wireless Telegraphy, of which the following is a specification.

The object of this invention is to provide an improved wireless aerial system which shall be particularly suitable fora receiving station used in conjunction with but separated from a transmitting station for duplex telegraphy. I

It is known that an aerial system consisting of two frames at right angles to each other, and used in connection with a radiogoniometer, can receive best fromany two opposite directions and eliminate signals from any two opposite directions at right an les to the first.

ccording to this invention, two similar directional aerial systems, each consisting of two vertical frames at ri ht angles to one another, are erected at equa distances froman adjacent transmitting station and at a distance apart in the direction of motion of the wave being received which is a considerable fraction of the wave length it is desired to receive. The moving coil of the radiogoniometer connected to eachdirectional aerial system is connected to a pair of wires leading to the receiving apparatus whlch is preferably arranged midway between them. Condensers are introduced Into the circuits comprising the leading wires, the movlng coils of the radio-goniometers, and the coils of the receiving apparatus in order to tune them to the desired wave. I

The invention is illustrated by the accompanying diagrams, in which Figure 1 shows a preferred relation between the recelvlng station and the adjacent transmlttlng sta= tion; Fig. 2 shows circuits wh ch I may employ at-a receiving station 1n accordance with one form of my invention; Fig. 3 shows circuits which I may employ at-ua transmitting station, and Fig. {shows the preferred arrangement of the BIllJlIB system.

In Fig. l, A, a are-two aerial or antennae systems each consisting of two equal vertical frames at right angles to each other. They mum receiving ower of the combination isobtained when and a are placed at a distance equal to one-half of the received wave length. 7 1

It is, however, generally more useful to place them at a distance apart equal to one quarter of the received wave length.

Although it is advisable to arrange A, a 1n the line of the desired communication, 1consilerable variation from this can be alowe In Fig. 2, C, c are two radio-goniometers the fixed coils of which are connected in the usual way to aerial or antennae systems A, a respectively.

The moving coils D, cl of the radiogoniometer are connected through tuning condensers E, e to coils F, farranged to act upon a common coil G which is connected up to the receiving apparatus H through the necessary tuning appliances.

As the directional systems A, a are at equal distances from the transmitting station B, the oscillations produced in them by waves from B will be equal and in phase provided all the circuits are correctly tuned; then if the coils D, d are set at equal angles and the couplings between F, G, and f, G are equal and opposite, no effect will be produced in the receiving apparatus H.

With these adjustments waves coming from any direction differing appreciably from the direction to or away from B will not produce opposing effects as the oscillations resulting in the two systems A, a will not be in phase.

To eliminate'signals from any desired direction other than that of B, it is only necessary to set the coils D, 03 respectively, to the angle at which the oscillations produced in transmitting station.

The result is that this construction provides a receiving. system which will not be affected by waves coming from four different direct ons, two of which are fixed relatively to thestation andtwo of which are controllable.

The invention can also be used in another 'way, i. e., supposing the radiogoniometer coils A and a are set to eliminate waves from B and that A and a are a quarter wave length apart, then waves coming in the line joining A and a will produce in the circuits connected to the radiogoniometers oscillations which are out of phase 90 degrees. If these circuits have their respective capacities and inductances adjusted in opposite sense-s so that-the phases of the oscillations in the two circuits are advanced and retarded 45 degrees, respectively. then waves coming from one direction will produce in the circuits oscillations which oppose, and waves coming from the other direction will produce I This arrangement is not claimed herein, however,

oscillations which are in phase.

but is claimed in m copending divisional reissue application, erial No. 398,5).

A similar construction can be applied to a In this case suitable radiogoniometers capable of dealing with the energyrare connected to two aerial systems similar to A, a, and the moving coils of the vradiogoniorneters are supplied with high frequency alternating currents from an alternatorlor other source such as indicated station S from which it is desired to receive most frequently. \Vhen receiving from S in this arrangement the circuits containing coils D, (Z being adjusted so that the phase angle between the current and electromotive force in one is equal to that between the current and electromotive force in the other, the transmitting station B may be operated at the same time provided only the coils D, d, are set at equal angles as previ ously mentioned, since the adjacent transmitting'antennaBf is equally distant from A and and"tlie coils F and f are coupled to coil G in opposition. The currents caused,

in D, d, by waves from B being thus equal and of op o'site effect, receiver H is not affected. onsequently, the operator isstill free while station B is operating, to turn,

coils D, d, to bring them into the planes of fields set up in the goniometers C, c by a third set of waves and thus to exclude undesired signals from a third station, such as B, operating at the same wave length as S and B, which may be a distant'station,

and which lies not too close to the line S,

A, a. If the station Bv approaches tooclose' to the line S A a diiiiculty arises due to the fact that the fields in the goniometers C, 0 due to waves from S and B lie in almost the same plane and a setting of the coils D, d which eliminates the undesired signals from B necessarily-eliminates most of the desired signals from S. The station B may be on either side of the line through B at right anglesto line A, a without-affecting the results just stated, the order in which the signal waves affect antennae A, a, being immaterial in this form of the invention. Moreover, the coils D,. 01 may be set to eliminate the signals from S and to receive those from B in case circumstances should render this desirable. I h

It will be seen that my invention comprises a novel arrangement including a plurality of spaced directive antennae associated with means whereby the system may discriminate between waves moving in either direction on three diverging lines, and I believe that I am the first to accomplish this result. Evidently, the positions of stations S and B may be interchanged also without affecting the results stated. It will beseen, moreover, that the novel results hereinbetore set forth are in addition to and in no wise exclusive of the methods of preventing interference by tuning as practised prior to my invention.

\Vhat I claim is:

1. A radio receiving station comprising an antenna system having directive portions separated by an appreciable fraction of a wave length inthe general direction of desired reception, and a local circuit comprising a receiver associated with said portions.

2. At a radio station,an antenna system having similar directive portions having an effective separation of an appreciable fraction of a wave length in the general direc tion of desired reception, a local circuit and means associating said local circuit and said directive portions for giving the combined structure when in use directive properties different from those of either portion alone.

3. At a radio station, an antenna system having directive portions arranged in alinement in the direction of desired reception,

' and effectively separated by an appreciable circuit, and adjustable means whereby the combined system has directive properties different from those of said directive portions alone.

4. In a'radio receiving apparatus, duplicate means having an effective separation of an app'reciable'fraction of a wave length signals as currents having different phases,

ma netic field producing means associated wit each of said duplicate means, and a local circuit associated with said last named means.

'5. In a radio receiving. apparatus, a plurality of directive antennae having an effective separation in the direction of desired reception as great as approximately one quarter wave length of the desired signals, a local receiving circuit, magnetic field pro-' ducing means associated with each. of said antennae and with said local circuit, an angularly adjustable coil in each field producmg means affected by said field and effecting an adjustment of current in said local cir-., cuit and means associated with said local circuit'for'detecting signal currents therein.

- 6. The combination at a wireless station oftwo similar aerials, each consisting of two vertical frames at right'angles to one another, two radiogoniometers connected thereto anda common circuit inductively coupled to the moving coils of the two gonitwo vertical frames at right angles to one another, two radiogoniometers connected thereto, a common receiving circuitfinduc- .tively coupled to themoving coils of the two goniometers and an adjacent transmitting station equidistant from the two aerials.

' 8. The combination at a wireless receiving station of two similar aerials situate at a distance apart equal to a quarter of the wave length ofthe waves to be received and each consisting of two vertical frames at right angles to one another, two radiogoniometers connected thereto, and a common receiver inductively coupled tothe moving coils of the two goniometers.

9. The combination at a wireless receiving station of two similar aerials situate at a distance apart equal to a quarter of the wave length of the waves to be received and each consisting of two vertical frames at right angles to one another, two radiogonioineters connected thereto, a common receivingcircuit inductively coupled to the moving coils of the two goniometers and an adjacent transmitting station equidistant from the two'aerials.

10. The combination at a wireless station of two similar directive aerials spaced apart, said aerials each having a plurality of aerial sections, which form parts of distinct cir: cuits, and a common circuit inductively coupled to said aerials.

11. The combination at a wireless station to, and common receiving means inductively the two aerials. I

distance apart equal to a fraction of the wave length of the waves to be received, each of said aerials having a plurality of aerial sections which forin parts of distinct circuits, and a common circuit inductively coupled to said aerials.

12. .The combination at a wireless station of two similar directive aerials situate at a distance apart equal to a quarter of the wave length of the wavesto be received, and a common circuit inductively coupled thereto.

13. The combination at a receiving station of two similar directive aerialssituate a distance apart equal to a fraction of the wave len' th of the waves'tobe received,'each of sai aerials having a plurality of aerial sections which form parts of distinct circuits, aj common receiver inductively coupled to said aerials, and an adjacent transmitting station equidistant from the two aerials.

14. The combination at a wireless station of two similar aerials, each consisting of two vertical frames at right angles to one another, two radiogoniom'eters connected there-- oupled to the moving coils of the two goniometers. r I v 15. The combinationat a receiving station of two similar aerials each consisting of two vertical frames at right angles to one another, two radiogoniometers connected there to,.receiving means. inductively connected to the moving coils of the two goniometers, and an adjacent transmitting station equidistant from the two aerials.

16. The combination at a wireless receiving station of two similar aerials situate at a distance apart equal to a fraction of the wave length of the waves to be received, and each consisting of two vertical frames at right angles to one another, two radiogoniometers connected thereto, and common receiving means inductively. coupled to the jmovin coils of the two goniometers. 17.. .he combination at a wireless receiv- 110 ing station of two similar aerials situate at a distance apart equal to a quarter of the wave length of the wavesto be received, and each consistingoftwo vertical frames at right angles-to one another, two radiogoniometer s connected thereto, receiving means inductively coupled to the moving. coils of the two goniometers, and-an adja-' cent transmitting station equidistant from 120 i 18 The combination atn'i'lwireless station of two similar directiveaenial systems whose centers are spaced apart, each of said aerial systems comprising a plurality of horizontally extending aerial sections arranged ap-' 125...

proximatelyparallel to aerialsections of the other aerial system and a common circuit inductively coupled to said aerial systems.

19. The combination at a wireless station of two similar directive aerial systems when 30 centers are situated at a distance apart equal to a fraction of the Wave length of the Waves to be received, each of said aerial systems comprising a plurality of horizontally extending aerial sections arranged approximately parallel to aerial sections of the other aerial system, and a common circuit injductivelv coupled to said aerial systemslifi 20. The combination at a receiving station of two similar directive aerial systems Whose centers are situated a distance apart equal to: a fraction of the Wave length of the Waves to be received, each of said aerial systems comprising a plurality of horizontally extending aerial sections arranged approximately parallel to aerial sections of the other aerial system, and a common'receiver inductively coupled to said aerial systems, and an adjacent transmitting station equidistant from the two aerials.

21. The combination in a radio system of two directive antennae spaced apart an appreciable-portion of a Wave length in the direction of desired signal reception, and

means'associating said antennae in a single antenna system for adjusting said system to render it unresponsive toward Waves moving at right angles to the line of the signals and also unresponsive to Waves in a line differing from the line of the signals.

0.. s. FRANKLIN.-

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