US1434986A - Radioreceiving system - Google Patents

Radioreceiving system Download PDF

Info

Publication number
US1434986A
US1434986A US472531A US47253121A US1434986A US 1434986 A US1434986 A US 1434986A US 472531 A US472531 A US 472531A US 47253121 A US47253121 A US 47253121A US 1434986 A US1434986 A US 1434986A
Authority
US
United States
Prior art keywords
waves
antenna
receiving apparatus
currents
receiving
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
US472531A
Other languages
English (en)
Inventor
Harold H Beverage
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.)
General Electric Co
Original Assignee
General Electric Co
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
Application filed by General Electric Co filed Critical General Electric Co
Priority to US472531A priority Critical patent/US1434986A/en
Priority to FR27863D priority patent/FR27863E/fr
Priority to GB14773/22A priority patent/GB180683A/en
Priority to DEG56689D priority patent/DE425670C/de
Application granted granted Critical
Publication of US1434986A publication Critical patent/US1434986A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Definitions

  • My present invention relates to radio receiriup systems, and more particularly to means for preventing interference in such systeu'is by waves of a wave length in the neighborhood of that of the waves which are to he received and which are traveling in the same direction as the waves to be received.
  • the object of my present invention is to provide means for permittin of the desired reception in a case such as t at referred to where the ordinary tuning customarily employed in the receiving circuit will not offer a high enough degree'of selectivity to effcctively eliminate the interference of signaling waves.
  • the unidirectional antenna which l have described in my application referred toabove is preferably untuned so that it odors no discriminating selectivity between the desired signaling waves and interfering waves.
  • Fig. i is a diagrammatic representation of a circuit which is the equivalent of the circuit of Fig. 3
  • Fig. 5 is a representation of tuning curves which may be obtained in the receiving system under different conditions of operation.
  • I employ a long horizontal antenna which is preferably c made up of two parallel conductors 1 and it which are grounded at the ends 3 and 4-. turrents received upon this antenna by signaling waves traveling through the other from the end toward the end 3 will be substantially zero. value at the end 4-, and will increase to a maximum value at end 3. 0n the other hand, currents produced in the antenna by other waves traveling from the end. 3 to the end i will be of substantially zero value at the end 3 and will be of a maximum value at the end at.
  • the signaling currents produced in theantenna at the end 3 may be impressed upon the receiving apparatus without any interference from currents produced by waves traveling in the opposite direction.
  • the ground connection at the end 3 may he made through the primary 5 of the transformer, the secondary 6 of which has its terminals connected respectively withconductors l and 3 2.
  • the conductors 1 and 2 will then serve as a transmission line for transmitting the desired signaling currents from the end 3 to the opposite end.
  • the conductors 1 and 2 thus form the two sides of a transmission line in which the desired si aling currents will flow in opposite directions.
  • the middle point of transformer secondary 6 is connected to ground at 3, andat the opposite end of the antenna the middle point of the primary winding 7 by means ofwhich the desired signaling currents will be impressed upon the receivln apparatus, is also connected to ground.
  • y 'reason ofthis connection currents produced in the antenna by waves traveling from the end 3 toward the end 4 and which flow in the same direction through conductors 1 and 2 will be divided equally between the two halves of the primary 7 and will produce no effect in the secondary 8.” If the ground connection at 4 is made through a resistance 9 having a value substantially equal to the surge impedance of the antenna, there will be no reflection of the signaling currents flowing toground at 4. These currents will then produce no interference with the reception of the desired signaling currents transmitted over the conductors 1 and 2 of the transmission line.
  • I provide a resonant circuit made up of inductance 11 and capacity 12 which is connccted in shunt to the primary 7 and which is tuned to the frequency of the interfering waves.
  • the impedance of this shunt circuit to the interfering currents will be so low in comparison with the impedance of the primary 7 that the effect of these interfering currents in the secondary 8 will be substantially eliminated.
  • the nature of the results which are obtained by the arrangement which i have described is indicated by the tuning curve shown in Fig. 5. which illustrates results which have been obtained under actual operating conditions.
  • the tuning curve A rep left-hand side of the tunin resents an actual tuning curve obtained in the receiving apparatus upon si als of a wave length of 14,200 meters without any interference shunt and with a near-by station operating at a wave length of 13.900 meters.
  • ⁇ Vhen an interference shunt tuned to the 13,900 meter wave length was employed the curve was shifted to the full line curve ,By using a second interference shunt 13 tuned to a wave len th of 14,500 meters the right-hand side of the tuning curve is shifted to the dotted'line C.
  • An interference shunt such as I have described may in some cases be more effectively employed in abridge circuit such,
  • the two halves of the winding 7 form two arms of the bridge
  • the interference 'shunt made of inductance 14 and capacity 15 forms the third arm
  • variable resistance 16 forms the fourth arm.
  • This bridge circuit may balanced by tuning the shunt to the interfering wave and then ad'usting the resistance 16 until the inter ering signal disappears.
  • the points 17 and 18 to which the receiving apparatus 10 "is connected will then be at equipotential points with respect to the interfering wave and the interference will be eliminated.
  • the bridge will not be balanced for the desired signals and the points 17 and 18 will not beat the same potential with respect to the desired signalin waves.
  • ave indicated another bridge arrangement in which two interference shunts are employed which are tuned for interfering frequencies above and below that of the desired signals.
  • the arms 19 and 20 of the bridge are each made up of two parallel interference shunts 21 and 22, while the other two arms of the bridge are formed by resistances 23 and 24.
  • the interference shunts are tuned to the two frequencies, one above and one below the desired signals, the points 25 and 26 to which the receiving apparatus is connected will be equipotential points with respect to si nalin waves of the two frequencies for w ich tie interference shunts are tuned.
  • the bridge will not be balanced for the desired signals and these signals will consequently be impressed upon the receiving apparatus without interference from the interfering waves.
  • each of two of the arms of said bridge including two parallel circuits which are tuned to two different frequencies, one above and one below that of the desired waves for preventing currents produced in said antenna by waves of frequencies above and below that of the desired waves and traveling in the same direction as the desired waves from being impressed upon said receiving apparatus, each of the two arms of said bridge which includes two parallel resonant circuits being so proportioned as to ofier a substantially infinite impedance to currents of the desired signaling frequency.
  • a resonant circuit which is tuned to a difierent frequency from that of the desired waves for preventing currents produced in said antenna by waves of a frequency near that of the'desired waves and travelin in the same direction as the desired waves rom being impressed upon said receiving apparatus.
  • a radio receiving system of an aperiodic receiving antenna which is grounded at both ends and which comprises a pair of parallel horizontal wires, means for causing currents produced in said antenna by waves coming from a desired direction to flow in opposite directions through the two wires thereof, a receiving apparatus and a bridge circuit for impressing upon said receiving apparatus currents flowing in opposite directions in the two wires of said antenna, one of the arms of said bridge comprising a resonant circuit which is tuned to a different frequency from that of the desired waves for preventing currents produced in said antenna by waves of a frequency near that of the desired waves and traveling in the same direction as the desired waves from being impressed upon said receiving apparatus.
  • each of two of the arms of said bridge including two parallel resonant circuits which are tuned to two different frequencies from that of the desired waves for preventing currents produced in said antenna by waves of a frequency near that of the desired waves and traveling in the same direction as the desired waves from being impressed upon said receiving apparatus, each of the arms of said bridge which include two parallel resonant circuits being so proportioned as to offer a substantially infinite im edance to currents of the desired signaling requency.
  • the combination in a radio receiving system of an aperiodic receiving antenna which is grounded at both ends and which comprises a pair of parallel horizontal wires, means for causing currents produced in said antenna by waves coming from a desired'direction to flow in opposite directions through the two wires thereof, are oeiving apparatus, nected to the two Wires of said antenna for impressing upon said receivin apparatus currents flowing in opposite irections' in and a bridge circuit conthe two wires of said antenna, each of two of the arms of said bridge comprising two papallel to two different frequencies, one above and one below that of the desired waves for preventing currents produced in said antenna by waves of frequencies above and below that of'the desired waves and traveling in the same direction as the desired waves from being impressed upon said receiving apparatus.
  • each of the two arms of said bridge which include two parallel resonant circuits being so porportioned as to ofier a substantially infinite impedance to currents of the desired signaling frequenc In witness whereof, ll have hereunto set my hand this 23rd day of May, 1921,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
US472531A 1921-05-25 1921-05-25 Radioreceiving system Expired - Lifetime US1434986A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US472531A US1434986A (en) 1921-05-25 1921-05-25 Radioreceiving system
FR27863D FR27863E (fr) 1921-05-25 1922-05-24 Perfectionnements aux postes radio-récepteurs
GB14773/22A GB180683A (en) 1921-05-25 1922-05-25 Improvements in and relating to wireless signalling systems
DEG56689D DE425670C (de) 1921-05-25 1922-05-25 Wellenantenne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US472531A US1434986A (en) 1921-05-25 1921-05-25 Radioreceiving system

Publications (1)

Publication Number Publication Date
US1434986A true US1434986A (en) 1922-11-07

Family

ID=23875890

Family Applications (1)

Application Number Title Priority Date Filing Date
US472531A Expired - Lifetime US1434986A (en) 1921-05-25 1921-05-25 Radioreceiving system

Country Status (4)

Country Link
US (1) US1434986A (fr)
DE (1) DE425670C (fr)
FR (1) FR27863E (fr)
GB (1) GB180683A (fr)

Also Published As

Publication number Publication date
GB180683A (en) 1923-01-18
FR27863E (fr) 1924-09-17
DE425670C (de) 1926-02-23

Similar Documents

Publication Publication Date Title
US1381089A (en) Radio receiving system
US1819589A (en) Means for elimination of fading on short wave lengths
US1434986A (en) Radioreceiving system
US1855184A (en) Radio receiving system
US2226836A (en) Interference-reducing system
US1471165A (en) Radioreception
US2306121A (en) Signaling arrangement for carrier frequency systems
US2097491A (en) Transmission line for electrical signaling systems
US1546878A (en) Radio receiving system
US1942488A (en) Electric wave filter
US1703171A (en) Electric-wave filter
US1800962A (en) Electric circuit
US2281997A (en) Submarine cable signal shaping system
US1834274A (en) Radio antenna system
US2031103A (en) Ultra short wave receiver
US1738274A (en) Wave transmission means
US1768239A (en) Directive antenna system
US1188531A (en) Duplex wireless system.
US2512481A (en) Antenna input circuits
US1715701A (en) Inghottse electric
US1615896A (en) High-frequency signaling system
US2558339A (en) Interference reducing radio receiving system
US2156137A (en) Band-pass selector
US2005388A (en) Wireless apparatus
US1487308A (en) Radio receiving system