US2477039A - Transceiver circuit arrangement - Google Patents

Transceiver circuit arrangement Download PDF

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Publication number
US2477039A
US2477039A US726991A US72699147A US2477039A US 2477039 A US2477039 A US 2477039A US 726991 A US726991 A US 726991A US 72699147 A US72699147 A US 72699147A US 2477039 A US2477039 A US 2477039A
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US
United States
Prior art keywords
frequency
receiver
transmitter
circuit
voltage
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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
US726991A
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English (en)
Inventor
Braak Dirk Johan
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust 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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2477039A publication Critical patent/US2477039A/en
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    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/023—Neutralization of the automatic frequency correction during a tuning change
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching

Definitions

  • the control voltage derived from the: said control circuit hereinafter the usual term ire'quencydiscriminator will be used, controls this case a reactance tube or other control member coupled with the frequency-determining circuit oi the transmitter, for example in view of trequencymodulation of thecarrier waveto-be transmitted, in such a manner that deviations of the transmitting frequency relatively to the tuning. of the receiver are substantially completely made up for.-
  • transceiver circuits of this kind is obviated by temporarily varying the transmitting. frequency occurring immediately upon changing over from reception to transmission relativelf to the tuning of the receiver.
  • The" invention is based.- on the recognition that the said drawback ensues-from the properties; of the discriminator inconjunction-- with the. switching-ofr of the transmitter during listening to a counterstation, as is necessary withtrarisceivers bod'i'ment of'the-invention,
  • Fig 2 is a schematic diagram of one preferred embodiment of the invention
  • v Fig. 3' is aschematic diagram or another preferred; embodiment of the invention.
  • - y in Fig. thetuning frequency (ordinate) of, for example; the frequency-determining circuit; of a transmitter is represented-as a functiontm ofthe tuning capacity of the circuit; a discriminator bringing the tuning trequ'ency of the circuit; as much as possible into an agreement with the tuningirequency we given by, the discriminator.
  • thetuningcapacity is varied between two values, for example,- of from C1, to Q6, lying on either side of the value of Co of the tuning capacity corresponding.
  • the relation betweenthe tuning frequency of the cireuitand the tuning capacity can, in principle; be represented by the curve I, 2, 3, 3, 4, 5,5 6.: At the points I, 2 the coupling to bebrought about by the discriminatorgis not yet operative. Qnly at a capacity value 633 slightl deviatin from C0 it'bec'oines operative; as a result oi which the f r equeney ws'jsreadjusted to the value ofwe? which differs only slightly from wo.
  • I .At C9 the coupling becomes opera-121%,. at 611 inoperative.
  • the range between and C11 is'reierreda-to as the control range or the discriminator, the much smaller range betw'een Csand G9 on the contrary astherangeof interference of the discriminator.
  • the interference range covers only a fraction of thecornir-oira'nge,-- regardless of the fact whether, for example; a disc'riminator of the: so-call'e'dphase-discriminating kind or watch type?
  • the receiver by the discriminator, and 'af ter the transmitter has been cut out for some-time'wi-th avi'ew' to; listening to a'ccunter station; the transmittinga frequency and the tuning or the receiver,
  • the receiving part arranged for superheteropled by the discriminator to render coupling inoperative, for it becomes operative only when the transmitting frequency is within the narrow interference range of the discriminator.
  • the temporary variations which has to bring the transmitting frequency for amoment within the interference range of the discriminator may,
  • a construction of this kind may, however, also become operative by mechanical shocks or vibrations which, of course, is undesirable. It is there- 'fore advisable that the means procuring the required frequency variations should as much as possible be electrical.
  • the transmitting part is shown on the left, the receiving part on the right of an aerial
  • the transmitting part comprises an oscillator I4 having a frequency-determining circuit l5 with which a reactance tube I6 is coupled.
  • the oscillations generated and, as the case may be, modulated in frequency by the reactance'tube iii, are supplied to the aerial l3 through a power dyne reception comprises a high-frequency preamplification stage l8, a mixing stage IS, a local oscillator 20, an intermediate-frequency amplifier 2
  • the transmitting or receiving part is connected to the aerial [3 by means of a transceiver switch 25.
  • the transmitter is switched 011"
  • the receiver re- "mains switched on, as the case may be with reduced sensitiveness, in view of bringing the transmitting frequency and the tuning of the receiver in agreement with one another, which takes place as follows.
  • the transmitted oscillations are also supplied to the receiver through a coupling condenser 26 having a low value.
  • the oscillations picked up by the receiver control a frequency-discriminator 21 connected to the intermediate-frequency receiving part (2
  • the control voltage obtained from the discriminator is introduced with such a polarity intothe control grid circuit30 of the reactance tube l6 of the transmitter connected to a negative bias battery 29 that deviations. of the transmitting frequency relatively to the tuning of the receiver are reduced.
  • the transceiver switch 25 has coupled to it a switch 3
  • This charging circuit comprises, besides the switch 3
  • a similar effect is obtainable by shuntingthe secondary winding. of the transformer 35 bya condenser. 36.
  • the resonant circuit thus ensued in the control-grid circuit 30 receivesan impetus when closing the switch 3
  • the form of construction shown may be simplified by includingin the grid lead 30 a coil instead of the variation of the transmitting frequency to be anticipated.
  • FIG. 3 shows one form of construction of an auxiliary circuit arrangement for the production of two succeeding voltage impulses having an opposite polarity, in which no inductive switching elements, but exclusively resistances and condensers are used.
  • auxiliary circuit shown in Fig. 3 is arranged to cooperate with elements I3 to 28 and 30 in Fig. 2, the grid lead 30 for reactance tube I6 being connected serially through discriminator output resistor 28 and through the auxiliary circuit to ground.
  • the auxiliary circuit shown in Fig. 3 comprises two switches 38 and 39 which; are coupled with the transceiver switch 25 and, during reception, are turned downwards.
  • a condenser 40 connected between the grid lead 30 of the reactance tube i6 and earth has supplied to it through resistances M, 42 and the switch 39 by means of a battery 43, 44,9, voltage which is higher, for example two times as high (2 Vg), as the grid bias (Vy) required by the reactance tube I6.
  • an auxiliary condenser 45 unilaterally earthed by the switch 38 is connected to the battery 43, 44 through the switch 39 and is thus also charged to a voltage of 2 V9.
  • the condenser 45 When operating the switches 38 and 39 the condenser 45 exhibits a charging voltage of 2 Vg which becomes operative in the last-mentioned circuit with a polarity opposite to that of the charging voltage of the condenser 40 and of the voltage of the battery 43. Immediately upon changing over from reception to transmission the junction between the resistances 4
  • the voltage of the condenser 40 assumes a value between Vg and 0 or even a positive value shortly after changing over from reception to transmission, Whereas the final voltage set up at the condenser 40, after changing over from reception to transmission, will be Vg.
  • a transceiver including a transmitter provided with a. tuned circuit for determiningthe operating frequency thereof, a tunable receiver and means to switch-over from reception to transmission, apparatusfor automatically aligning the operating frequency of the transmitter with the frequency to which the receiver is tuned comprising a frequency control transceiver to apply momentarily an auxiliary control voltage to said device to swing the frequency of the transmitter into the operating range of said discriminator.
  • a transceiver including a transmitter provided with a tuned circuit for determining the operating frequency thereof, a tunable receiver and means to switch-over from reception to transmission
  • apparatus for automatically-aligning the operatin frequency of the transmitter with the frequency to-which the receiver is tuned comprising an electronic frequency control device coupled to the tuned circuit of said transmitter and arranged to adjust the frequency thereof in accordance with a control voltage, a frequency discriminator coupled to said receiver to develop a control voltage whose value is proportional to the deviation of the transmitter frequency relative to the frequency of the receiver within a predetermined range of deviation, means to apply said control voltage to said device to effect a corresponding adjustment in the'frequency of said transmitter, and means responsive to the switch-over operation in the transceiver to apply momentarily an auxiliary control voltage to said device to swing the frequency of said transmitter into said range of deviation.
  • a transceiver including a transmitter provided with a tuned circuit for determining the operating frequency thereof, a tunable receiver and means to switch-over from reception to transmission, apparatus for automatically aligning the operating frequency of the transmitter with the frequency to which the receiver is tuned comprising a grid-controlled reactance tube coupled to the tuned circuit of said.
  • a transmitter and arranged to adjust the frequency thereof in accordance with a control voltage applied to the grid of said tube, means to apply a bias voltage to the grid of said tube, a frequency discriminator coupled to said receiver to develop a control voltage whose value is proportional to the'deviatio'n or" the transmitter frequency relative to the frequency of the receiver Within a predetermined range of deviatiommeans to apply said control voltage to the gridof said tube to effect a correspondingadjustment in the ire- Y quency of said transmitter, and means responsive to the switch-over operation in said transceiver for varying momentarily the bias on the grid of said tube to swing the frequency of said transmitter into said range of deviation,
  • atransceiver includ- 7 ing a transmitter provided with a tuned circuit for determining the operating frequency thereof, a tunable receiver and means to switch-over from reception to transmission, apparatus for automatically aligningthe operating frequency of the transmitter. withthe frequency to which the receiver is tuned comprising agrid-controlled reactance tube coupled to the tuned circuitl of said transmitter and arranged to adjust the frequency thereof in accordance ,witha control voltage applied to the grid of said tube, means to apply a bias voltage to the grid of said tube, a frequency discriminator coupled to said receiver to develop a control voltage whose'value is pro-- portional to the deviation of the transmitter frequency relative to the frequency of the receiver within a predetermined range of deviation, means to apply said control voltage to'the grid of said tube to eifect a corresponding adjust-v ment in the frequency ,of said transmitter, and means responsive to theswitch-over operation in said transceiverfor varying momentarily the bias on the grid of said tube, to swing the frequency of said transmitter into said
  • a tuned, receiver and means .to'switch-over'from reception to transmission, apparatus forautomatically aligningjthe operating frequency of the '/transmitter withthe frequency to which the receiver istuned comprising a grid-controlled reactance tube'coupled to the tuned circuitof said transmitter andarranged to adjust the frequency 'thereof in accordance with acontrol voltage applied to the grid of ,said tube, a frequency discriminator coupled to said receiver to develop a control voltage whose value is proportional to the switch upon the switch-over of said transceiver further including a capacitance connected across said secondary to define a resonant circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Radar Systems Or Details Thereof (AREA)
US726991A 1944-01-05 1947-02-07 Transceiver circuit arrangement Expired - Lifetime US2477039A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL248979X 1944-01-05

Publications (1)

Publication Number Publication Date
US2477039A true US2477039A (en) 1949-07-26

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US726991A Expired - Lifetime US2477039A (en) 1944-01-05 1947-02-07 Transceiver circuit arrangement

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US (1) US2477039A (en])
BE (1) BE461892A (en])
CH (1) CH248979A (en])
DE (1) DE809210C (en])
GB (1) GB627407A (en])
NL (2) NL64005C (en])

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790072A (en) * 1951-09-27 1957-04-23 Philips Corp Tunable transceiver
US2901597A (en) * 1955-07-19 1959-08-25 Craig L Whitman Transmitter frequency control
US3935533A (en) * 1973-03-02 1976-01-27 United Technologies Corporation Single oscillator microwave transceiver

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114036A (en) * 1936-10-17 1938-04-12 Bell Telephone Labor Inc Frequency stabilization system
US2206695A (en) * 1937-07-10 1940-07-02 Radio Patents Corp Means for receiving high frequency signals
GB551472A (en) * 1941-08-20 1943-02-24 James White Dalgleish Improvements in modulated high frequency carrier wave signalling systems
US2317547A (en) * 1941-09-06 1943-04-27 Don C Mcrae Communication system
US2379395A (en) * 1944-05-05 1945-06-26 Hartford Nat Bank & Trust Co Fm transceiver
US2408826A (en) * 1943-06-21 1946-10-08 Galvin Mfg Corp Combined frequency modulation radio transmitter and receiver
US2425013A (en) * 1944-04-07 1947-08-05 Sperry Gyroscope Co Inc Frequency control system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114036A (en) * 1936-10-17 1938-04-12 Bell Telephone Labor Inc Frequency stabilization system
US2206695A (en) * 1937-07-10 1940-07-02 Radio Patents Corp Means for receiving high frequency signals
GB551472A (en) * 1941-08-20 1943-02-24 James White Dalgleish Improvements in modulated high frequency carrier wave signalling systems
US2317547A (en) * 1941-09-06 1943-04-27 Don C Mcrae Communication system
US2408826A (en) * 1943-06-21 1946-10-08 Galvin Mfg Corp Combined frequency modulation radio transmitter and receiver
US2425013A (en) * 1944-04-07 1947-08-05 Sperry Gyroscope Co Inc Frequency control system
US2379395A (en) * 1944-05-05 1945-06-26 Hartford Nat Bank & Trust Co Fm transceiver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790072A (en) * 1951-09-27 1957-04-23 Philips Corp Tunable transceiver
US2901597A (en) * 1955-07-19 1959-08-25 Craig L Whitman Transmitter frequency control
US3935533A (en) * 1973-03-02 1976-01-27 United Technologies Corporation Single oscillator microwave transceiver

Also Published As

Publication number Publication date
GB627407A (en) 1949-08-09
DE809210C (de) 1951-07-26
NL114597B (en])
BE461892A (en])
CH248979A (de) 1947-05-31
NL64005C (en])

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