US1888065A - Differential volume control for diversity reception - Google Patents

Differential volume control for diversity reception Download PDF

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Publication number
US1888065A
US1888065A US325304A US32530428A US1888065A US 1888065 A US1888065 A US 1888065A US 325304 A US325304 A US 325304A US 32530428 A US32530428 A US 32530428A US 1888065 A US1888065 A US 1888065A
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US
United States
Prior art keywords
antennas
amplifiers
energies
volume control
amplifier
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
US325304A
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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.)
RCA Corp
Original Assignee
RCA Corp
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 NL27083D priority Critical patent/NL27083C/xx
Priority to US255608A priority patent/US2004107A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority to US325304A priority patent/US1888065A/en
Priority to DER77098D priority patent/DE494222C/de
Priority to GB38041/29A priority patent/GB339499A/en
Priority to DER80084D priority patent/DE543903C/de
Application granted granted Critical
Publication of US1888065A publication Critical patent/US1888065A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Definitions

  • This invention relates to diversity reception, and more particularly toa method. and means for advantageously regulating the output from a plurality of antennas.
  • Short wave signals are subject to fading which varies both in frequency and degree in an unpredictable manner. Inasmuc'h as the fading ⁇ at any instant may differ very Widely at geographically spaced points, or in different planes of polarization, it has been suggested that a receiving station be equipped With a number of antennas having different fading characteristics,the energies Lcollected by which are fed to a single signal responsive means.
  • my invention includes simultaneously making'la plurality Vof separate energy collections of relatively 100 different fading characteristics, preferably by collecting the energy on a plurality of geographically spaced antennas, separately amplifying each of the collected energies, controlling the gain in the aforesaid step of amplification of the energies in accordance with the amplitudes of the other energies, in order to strengthen the maximum signal or greatly magnify the ratio of the initial signal strengths, even to the point of completely cutting 0E a weaker signal, thereafter combining the energies, and translating the combined energy.
  • the foregoing method is unstable, because with even a very slight initial difference in the signal strength, the stronger signal is amplified, which then weakens the weaker signal, which then serves to more greatly. amplify the'stronger signal, so that almost instantaneously the weaker signal is completely cut out, while the stronger signal is greatly amplified. Thereafter the arrangement will not function to receive energy from the antenna. which has been cut out, even though its signal shouldgrow stronger, except if the signal on the antenna which before was a "maximum should fade practically to zero, in which event the'amplification gain is shifted rapidly, so as to greatly amplify the signal which then is a maximum.
  • the energy supplied to the translating device is kept constant by reason of the normal volume control operation of the first amplifier.
  • the second amplifier of the other antenna begins to be made conductive, and energy passing therethrough makes the second amplifier of the formerly active antenna grow non-conductive, and at the same time makes the first amplifier ⁇ of the now active antenna attain such a. bias as will supply the desired constant amount of energy to the translating device.
  • the antenna which is cut out'by reasonlof its second amplifier being negatively biased, at the same time has its first amplifier made highly conductive, which permits admission of the cut out signal init-s turn with little or no initial difference in signal amplitude.
  • the volume control means preferably com ⁇ prise detector tubes with impedan'ces in their anode circuits from which th-e amplifier bias potentials are obtained through electrically slow circuits.
  • I combine the rectified energies obtained from the volume control detectors, thus dispensing'with separate detectors, and this combination may vbest be made through coupling tubes connected to the detectors. the output of the coupling tubes being fed to a common translating device.
  • Figure 2 is a modification showing how my invention may be applied toa system having more than two antennas
  • Figure 3 indicates an alternative form of bias lead connection when two antennas are l employed.
  • Figure 4 indicates an alternative form of biaslead connection when three antennas are employed.
  • antennas 2 and. Il which are arranged to have different fading characteristics, either by being positioned inY different planes of polarization or ⁇ more prefl erably, by being geographically spaced a substantial distance apart relative to the working wave length, or both.
  • the antenna 2 is coupled by a transmission line 6 to a first amplifier 8. which in turn leads to a second amplier 10. while the antenna 4l is coupled by a transmission line 12 to a first amplifier '14, which leads to a second amplifier lf3.
  • the amplified outputs are fed to detector tubes 18 and 20, which also act as volume con ⁇ trol detectors.
  • the anode circuits of the tubes include low pass filters 22 and 24e.' and sources of direct anode potential 26 and 28,
  • the conpling impedances 30and 32 which complete' feo f the :anode circuits to ground.
  • the weaker signal is weakened and due to the.
  • volume control circuit 34, 38 By means of a lead 50 to the amplifier 8 vand the volume control circuit 36, 40 by a lead 52 to the amplifier 14.
  • This volume control functions in ordinary fashion, and serves tokeep the volume of the signal being utilized at a desirable level, land at the same time, makes the change-over from one antenna to another practically unnoticeable because the nal energy output to which the translating device is responsive is always ⁇ keptat the desired signal level.
  • the coupling Yimpedances 30 'and 32 are each led to coupling tubes 54 and 56 through blocking conldensers ⁇ 58 ⁇ and 60.
  • the controlelectrodes of the tubes are biased by batteries 62 and 64,
  • the anode circuit is then completed to a source of direct Aanode potential and to ground.
  • My invention may be applied 'to systems ⁇ having any number of antennas, it being control circuits 162, 164, and 166.
  • the desired signal is fed to coupling tubes v'172, 17 4, l
  • each of the electrically/slow volume control circuits are coupled to the control electrodes of the tubes in the correspondingr firstzamplifier, andalso to t-hecontrolV electrodes .of the .tubes in either the secondV or the third amplier of the other antennas.
  • the volume control circuit 162 j willbias the amplifiers 144, 'and-',136 to cutv ofi" While a maximum signal on the'antenna -104V will Vcause the volume control circuit 164V tobias the amplifiers 142 and 146 to cut off,
  • the connections may be arranged as in Figures 3 :and 4, in which all of the first amplifiersare ⁇ coupled together and -to-a volume control unit, whileall of the .second amplifiersare vcoupled together and to a second volume control unit, and, in the case of Figure 4, all of the third amplifiers are coupled together and to a third volume control unit.
  • this arrangement any desirednumberof antennas. f Y y
  • the method of diversity reception which includes making a plurality of energy collections having different fading characteristics, separately amplifying each of the collected energies, controlling the gain in the aforesaid step of amplification ofthe energiespartially in accordance with the magnitude of the other energies, and partially in accordanceV with the magnitudeof the energy in question, in order to strengthen the maximum signal and to make the change overV ther amplification in accordance with the output of the other energies, combining the final output energies, and translating the combined energy.
  • the method ofdiversit-y reception whichv includes making a plurality of energy collections at geographically spaced points,
  • the method of diversity reception which includes making aplurality'of energy collections of different fading characteristics, separately amplifying each of the-collected energies a plurality of times, rectifying the amplified energies, controlling the gain 'in some of the steps of amplification in accordance with t-he amplitude of the corresponding rectified energy, controlling the gain in the other steps of amplification in accordance with the amplitude of the other rectified energies, combining the rectified energies, and translating the combined energy.
  • the method of Y diversity reception which includes making a plurality of energy collections at geographically spaced points,
  • a diversity receiving system comprising a plurality of antennas having different fading characteristics, an amplier coupled Ito each of the antennas, volume control means following each of the amplifiers, and means so coupling each of the volume control means to the amplifiers as to control the gain in the amplifiers partially inV accordance with .the magnitude of the energies from the other amplifiers, and partially in accordance with theV magnitude of their own outputs, in order'to strengthen the maximum signal and to make the change-overl from one signal to another more stable and less noticeable, means to combine the volume controlled energies, and means to translate the combined energy.
  • a diversity receiving system comprising a plurality of geographically spaced'antennas, an amplifier coupled to each of the antennas, further amplifiers coupled to each of the first amplifiers, a rectifier coupled-to each of the 'last amplifiers, a volume control impedance in each of the rectifier circuits, means coupling the volume control impedances to corresponding first amplifiers and tov the further amplifiers of the other antennas, means to combine the rectified energies, and means to translate'the combined energy.
  • a diversity receiving system comprising two geographically spaced antennas, an electron emission tube amplifier coupled to each ofthe antennas, a second electron emission tube amplifier coupled to each of the first amplifiers, a detector coupled to each of the second amplifiers, a volume controlling bias lead connected from the anode circuit of l each of the detectors-to thecontrol electrodes of the tubes inthe corresponding first amplifier and to the control electrodes of the tubes in the other second amplifier, means to combine the rectified energies, and means to lating device, and means coupling the anode circuits of the coupling tubes togetherV and to the translating device.
  • a diversity receiving system comprising three geographically spaced antennas, an electron emission tube amplifier coupled to each of the antennas, second and -third electron emission tube amplifiers coupled to each of the first amplifiers, a detector coupled to each of the third amplifiers, a volume control lo bias lead connected from the anode circuit of each of the detectors to the control electrodes of the tubes in the corresponding rst amplifiers and to the control electrodes of the tubes in one of the second and third ampli- ,5 horrs of the other antennas, a coupling tube connected to each of the detectors, a translating device, and means coupling the anode circuits of the coupling tubes together and to the translating device. 2u HAROLD H. BEVERAGE.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radio Transmission System (AREA)
US325304A 1928-02-20 1928-12-11 Differential volume control for diversity reception Expired - Lifetime US1888065A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL27083D NL27083C (enrdf_load_stackoverflow) 1928-12-11
US255608A US2004107A (en) 1928-02-20 1928-02-20 Radio receiving system
US325304A US1888065A (en) 1928-12-11 1928-12-11 Differential volume control for diversity reception
DER77098D DE494222C (de) 1928-02-20 1929-02-05 Verfahren zur Verminderung der Schwundwirkung bei drahtlosem Empfang
GB38041/29A GB339499A (en) 1928-02-20 1929-12-11 Improvements in or relating to radio receiving systems
DER80084D DE543903C (de) 1928-12-11 1929-12-12 Anordnung zur Verminderung der Schwundwirkung bei drahtlosem Empfang mittels einer Mehrzahl von Antennensystemen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US325304A US1888065A (en) 1928-12-11 1928-12-11 Differential volume control for diversity reception

Publications (1)

Publication Number Publication Date
US1888065A true US1888065A (en) 1932-11-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US325304A Expired - Lifetime US1888065A (en) 1928-02-20 1928-12-11 Differential volume control for diversity reception

Country Status (3)

Country Link
US (1) US1888065A (enrdf_load_stackoverflow)
DE (1) DE543903C (enrdf_load_stackoverflow)
NL (1) NL27083C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423437A (en) * 1934-08-25 1947-07-08 Bell Telephone Labor Inc Direction finder
US2424972A (en) * 1945-04-02 1947-08-05 Standard Telephones Cables Ltd Transmitter control circuit
US2553271A (en) * 1945-12-11 1951-05-15 Rca Corp Diversity receiver
US2845528A (en) * 1953-03-17 1958-07-29 Bendix Aviat Corp Dividing and limiter circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423437A (en) * 1934-08-25 1947-07-08 Bell Telephone Labor Inc Direction finder
US2424972A (en) * 1945-04-02 1947-08-05 Standard Telephones Cables Ltd Transmitter control circuit
US2553271A (en) * 1945-12-11 1951-05-15 Rca Corp Diversity receiver
US2845528A (en) * 1953-03-17 1958-07-29 Bendix Aviat Corp Dividing and limiter circuit

Also Published As

Publication number Publication date
NL27083C (enrdf_load_stackoverflow)
DE543903C (de) 1932-02-11

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