US2151922A - Receiver for electromagnetic waves - Google Patents

Receiver for electromagnetic waves Download PDF

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Publication number
US2151922A
US2151922A US43486A US4348635A US2151922A US 2151922 A US2151922 A US 2151922A US 43486 A US43486 A US 43486A US 4348635 A US4348635 A US 4348635A US 2151922 A US2151922 A US 2151922A
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US
United States
Prior art keywords
receiver
dipole
electromagnetic waves
receiving
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US43486A
Inventor
Kramar Ernst
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel SEL AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DEL81003D priority Critical patent/DE577350C/en
Priority to DEL85653D priority patent/DE616026C/en
Priority to DE2151922X priority
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Priority to DEL90023D priority patent/DE659836C/en
Application granted granted Critical
Publication of US2151922A publication Critical patent/US2151922A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Description

RECEIVER FOR ELECTROMAGNETIC WAVES Filed Oct. 4, 1935 2 radio rmeiuer Fig. 2
fiwmfor; frflsf/framar fzarzzey Patented Mar. 28, 1939 RECEIVER FOR ELECTROMAGNETIC WAVES Ernst Kramar, Berlin-Tempelhof, Germany, as-
signor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Germany, a company Application October 4, 1935, Serial No. 43,486 In Germany October 5, 1934 Claims.
In Patent No. 2,028,510, dated January 21, 1936, for Transmitter for electro-magnetic waves, it is proposed to feed a dipole continuously from a high frequency generator and to key a reflecting antenna allotted to this dipole, or several such reflecting antennae alternately, in order to effect with the aid of the differently shaped field intensity ourves thus produced a comparison of field intensities on an aircraft, vessel or other means of transportation.
The novel invention proposes to employ arrangements of this construction also on the receiving side and also discloses special means for carrying out the receiving method.
t is well known per se, in order to obtain bearings with respect to a transmitter, to employ also on the receiving side such methods of comparing field intensities as are known in their application to the transmitting side. Arrangements of the above-mentioned type are to a peculiar degree adapted for this purpose, since by merely providing a dipole not to be keyed and one dipole to be keyed, or a dipole not to be keyed and two dipoles to be keyed, a two-beam beacon is created,
so that the direction is determined more exactly than with other beacons. There is no dificulty, however, in obtaining exact bearings by disposing a reflector dipole that acts to cause the energy to be efficient in one main direction.
The invention will be understood from the following description and be particularly pointed out in the appended claims, reference being had to the accompanying drawing in which Fig. l is a diagrammatic elevation of an example of the receiving device intended to be stationed on an aircraft or other means of transportation, Fig. 2 is a plan showing a further development of this example.
As represented in Fig. 1, a dipole E is connected to the receiver Q. On both sides of the dipole or main antenna E and preferably in line therewith are arranged two dipoles RI, R2. These are interrupted in the middle and may be closed by relays Ml, M2. Instead of interrupting the dipoles RI, R2, it is possible to provide for them to be detuned, for example. The relays MI, M2 are alternately energized and de-energized by a commutator K which is driven by a motor A. By this means the dipoles RE, R2 are opened and closed in a suitable dot-dash rhythm. It is assumed in the drawing that the dipole R! is opened, that is inactive, and the dipole R2 closed, that is active. Connected to the output circuit of the receiver Q is the primary of a transformer T, with the secondary of which an instrument J for giving a visual indication is in connection. This instrument is very sensitive in the normal position of its pointer and relatively insensitive in the range of the maximum deflection thereof. Instruments of this character are well known Der se.
Such an instrument J in connection with the transformer T has the advantage that according 'to the direction of the first potential impulse conveyed over the transformer, and which is characteristic of whether a dot or a dash is given, the pointer is strongly moved to the right or left hand side of the scale and remains in such position because the next potential impulse will act on the pointer in a position thereof where the instrument is of a less sensitiveness. This device thus allows of distinguishing between dot and dash signals, so as to indicate whether the aircraft or the like is on or off the course to befollowed. The application of this indicating method to an antenna arrangement comprising a continuously closed dipole and one or more dipoles to be keyed, has the advantage that the indicating device does no more require the provision of special switching'means so as to avoid the disturbances which are due to such switching means.
If it is desired toprovide for a unilateral direc tional characteristic a reflector dipole P, which is not to be keyed, is disposed, as shown in Fig. 2.
The whole antenna arrangement is rendered rotatable, if it is desired to obviate the necessity for turning the vehicle itself.
What is claimed is:
1. In a radio receiving arrangement for wireless direction finding, a main antenna, a radio receiver connected thereto, a reflecting arrangement in the vicinity of and cooperating with said main antenna, and means for keying said refleeting arrangement intermittently to obtain two different mutually displaced and intersecting directional characteristics.
2. In a radio receiving arrangement for wireless direction finding, a main antenna, a radio receiver connected thereto, a reflector on each side of and cooperating with said main antenna,
and means for alternately keying said reflectors intermittently to obtain two different mutually displaced and intersecting directional characteristics.
3. A radio receiving arrangement according to claim 1 and in which an additional reflector produces a unilateral directional receiving characteristic, the plane including said additional reflector and the main antenna being substantially fleeting arrangement intermittently to obtain two different mutually displaced and intersecting directional characteristics, means for comparing the intensities of the received fields of the alternately produced directional characteristics, said 5 means including an indicating instrument having a pointer and highly sensitive in the mean position of the pointer and relatively insensitive at the maximum position of the pointer, and a transformer coupling said indicating instrument 10 with said receiving device.
ERNST KRAMAR.
US43486A 1932-04-20 1935-10-04 Receiver for electromagnetic waves Expired - Lifetime US2151922A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DEL81003D DE577350C (en) 1932-04-20 1932-04-20 Send arrangement to achieve course lines
DEL85653D DE616026C (en) 1932-04-20 1934-04-07 Send arrangement for achieving course lines according to
DE2151922X 1934-10-05
DEL90023D DE659836C (en) 1934-04-07 1936-03-22 Send arrangement to achieve course lines

Publications (1)

Publication Number Publication Date
US2151922A true US2151922A (en) 1939-03-28

Family

ID=34069174

Family Applications (3)

Application Number Title Priority Date Filing Date
US638907A Expired - Lifetime US2028510A (en) 1932-04-20 1932-10-21 Transmitter for electromagnetic waves
US14212A Expired - Lifetime US2072268A (en) 1932-04-20 1935-04-02 Transmitter for electromagnetic waves
US43486A Expired - Lifetime US2151922A (en) 1932-04-20 1935-10-04 Receiver for electromagnetic waves

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US638907A Expired - Lifetime US2028510A (en) 1932-04-20 1932-10-21 Transmitter for electromagnetic waves
US14212A Expired - Lifetime US2072268A (en) 1932-04-20 1935-04-02 Transmitter for electromagnetic waves

Country Status (6)

Country Link
US (3) US2028510A (en)
BE (1) BE414649A (en)
DE (2) DE577350C (en)
FR (7) FR44877E (en)
GB (5) GB405727A (en)
NL (3) NL38464C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492354A (en) * 1945-04-09 1949-12-27 Standard Telephones Cables Ltd Dipole antenna direction finder
US2831189A (en) * 1945-06-23 1958-04-15 Robert J Kemper Wide band homing system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2229733A (en) * 1938-05-13 1941-01-28 Internat Telephone Dev Co Inc Antenna structure
DE761950C (en) * 1941-05-10 1954-01-18 Lorenz C Ag Procedure for course setting by means of frequency-modulated radiation
US2439663A (en) * 1942-02-26 1948-04-13 Hazeltine Research Inc System for navigating aircraft

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492354A (en) * 1945-04-09 1949-12-27 Standard Telephones Cables Ltd Dipole antenna direction finder
US2831189A (en) * 1945-06-23 1958-04-15 Robert J Kemper Wide band homing system

Also Published As

Publication number Publication date
FR44877E (en) 1935-04-24
FR44879E (en) 1935-04-24
GB442193A (en) 1936-02-04
FR795983A (en) 1936-03-26
DE616026C (en) 1935-07-18
NL38464C (en)
GB444005A (en) 1936-03-11
BE414649A (en)
FR741872A (en) 1933-02-22
FR45994E (en) 1936-01-17
NL46080C (en)
NL41765C (en)
US2072268A (en) 1937-03-02
GB405727A (en) 1934-02-15
FR47380E (en) 1937-03-25
FR47701E (en) 1937-06-22
US2028510A (en) 1936-01-21
GB438804A (en) 1935-11-25
DE577350C (en) 1933-05-30
GB472941A (en) 1937-10-04

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