US1746796A - Radioreceiver - Google Patents

Radioreceiver Download PDF

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Publication number
US1746796A
US1746796A US20902A US2090225A US1746796A US 1746796 A US1746796 A US 1746796A US 20902 A US20902 A US 20902A US 2090225 A US2090225 A US 2090225A US 1746796 A US1746796 A US 1746796A
Authority
US
United States
Prior art keywords
crystal
circuit
resistance
aerial
inductance
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
US20902A
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English (en)
Inventor
Round Henry Joseph
Rust Noel Meyer
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
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1746796A publication Critical patent/US1746796A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers

Definitions

  • the crystal was also connected to one end of a resistance which could be varied between 1000 and 12000 ohms, and the other end of this resistance was connected to the positive pole of a volt battery which could be tapped with variations of 1 volts, the negative pole being connected to the cats whisker.
  • the best results were obtained with the highest values of the resistance and of the battery voltage practicable, but not more than 50 volts are advisable as with higher voltages the cats whisker is apt to get burnt when adjusting.
  • To the high potential end of the variometer was also connected a carborundum crystal, and its metallic contact was connected to a pair of ordinary high resistance telephones shunted by a 10 jar disc 1 condenser generally used at low value, and
  • the aerial inductance When receiving wave lengths of the order of 350 meters the aerial inductance may be of the order of 150 microhenries. For 3500 meters the value of the aerial condenser would depend on the aerial employed while for small aerials such a condenser would not be necessary except for fine tuning. The value of the condenser in series with the negative resistance crystal would be of the order of @002 mid. and that of the aerial inductance from 1000 to 1500 microhenries, while for greater wave lengths the values of this condenser I and of the inductance should be roughly proportional to the wave length.
  • Arzenite is the trade name of a new product and is a nearly pure crystalline form of zinc oxide.
  • the characteristic curve of each of these crystals possesses a sharply defined kink or knee and to obtain the negative resistance effect the value of the resistance in series with the crystal should be so great that the part above the knee of the characteristic of the' crystal and resistance combined is. not too steep, otherwise the circuit will be unstable.
  • ⁇ Ve may employ more than one crystal or crystal contact and preferably we employ a separate control resistance for each crystal.
  • e may also employ a crystal connected in such a circuit for reducing the damping of a rejector circuit employed for eliminating one particular wave length.
  • a metal plate which has had a film of oxide produced on it by striking an arc on its surface.
  • Suitable metals for use in this way are zinc, aluminium, iron, copper and nickel.
  • Ve apply to the film of oxide on such a plate a loose contact, such as a cats whisker, and connect this contact to a resistance and a source of current and so to the back of the plate.
  • the contact and the back of the plate we also connect to an output circuit and are thus enabled to obtain in this output circuit a negative resistance effect or oscillations as desired.
  • this brown oxide is formed in a ring upon the white oxide.
  • the circuit A comprises a condenser 2, crystal or plate 8, as above described, a loose contact 4, such as a cats whisker which is applied to the crystal on plate 3, high resistance 5, and current source 6 connected to the aerial inductance 1, while the circuit B comprises rectifier 7 such as a carborundum crystal and telephones 8, also connected to the aerial inductance 1.
  • the circuit A is inductively coupled to the inductance 1, the circuit B being connected to the said inductance.
  • circuit A is connected to the inductance 1 and the circuit B is inductively coupled thereto.
  • a condenser 9 is provided in circuit B.
  • Fig. 4 illustrates a further modification
  • Means for effectively reducing the resistance of an aerial circuit provided with an inductance, said means including an adjustable condenser and a rectifying crystal or oxidized plate in series therewith connected across said inductance, and a source of current and a resistance in series therewith connected in parallel with said rectifying crystal or oxidized plate.
  • Means for efiectively reducing the resistance of an aerial circuit provided with an inductance, said means including a circuit comprising an adjustable condenser and a rectifying crystal or oxidized plate in series therewith, and a source of current and a resistance in series therewith connected in parallel with said rectifying crystal or oxidized plate, said last mentioned circuit being inductivay coupled to the aerial inductance.
  • Means for reception consisting of an aerial inductance, two circuits, one of which is connected to the inductance and contains a rectifying crystal and a condenser in series with one another, and a high resistance and a source of current connected across said crystal, the second circuit also being connected to the inductance and containing a rectifier in series with a sound responsive means.
  • Apparatus for receiving high frequency signals including a detector circuit and an independent auxiliary circuit coupled thereto, said auxiliary circuit including a rectifying crystal means for obtaining a negative resistance effect and a biasing battery electrically associated with the crystal means.
  • Apparatus for receiving high frequency signals including a detector circuit and an independent auxiliary circuit coupled there to, said auxiliary circuit including a rectifying oxidized plate shunted by a biasing battery for obtaining a negative resistance effeet.
  • Apparatus for receiving high frequency signals including a detector circuit and an independent auxiliary circuit coupled thereto, said auxiliary circuit including a loW resistance rectifying crystal for obtainin a negative resistance effect, the operative ace of the crystal being fused and a source of potential connected to said crystal.
  • Apparatus for receiving high frequency signals including an aerial, a circuit coupled to said aerial and comprising a rectifier and sound detecting means, and an independent auxiliary circuit also coupled to the aerial for efiectively reducing the resistance of the aerial, comprising a condenser and a low resistance rectifying crystal, and a source of current and a resistance in'series therewith connected across said crystal.
  • means for obtaining negative resistance whereby the circuit resistance may be effectively reduced said means including a rectifying crystal of low resistance, the current-potential characteristic curve of which possesses a sharply defined knee.
  • Means for obtaining negative resistance including a rectifying crystal or plate having a film of oxide formed upon its surface.
  • An arrangement for producing negative resistance effects comprising a rectifying crystal or oxidized plate shunted by a biasing battery, said crystal or oxidized plate having the characteristic of decreasing resistance with increase of potential beyond a certain critical value.
  • Means for obtaining negative resistance eifects comprising a tuned circuit having in series an inductance, a variable condenser and a low resistance rectifying crystal, and a biasing battery and resistance in parallel with said crystal, the arrangement being such that with increase of potential beyond a certain critical value the resistance ofthe crystal will decrease.
  • means, for reducing the resistance thereof which comprises a second circuit coupled to said first circuit, said second circuit containing a rectifying crystal, and means, electrically associated with the crystal, for adjusting the potential across said crystal to cause the latter to function on a suitable portion of its current-potential characteristic.
  • a high frequency translating circuit including means for reducing the resistance thereof, said means comprising a second circuit coupled to said translating circuit the second circuit including a negative resistance rectifying crystal, and biasing means, electrically associated with the crystal, whereby the latter functions as a resistance compensating device.
  • a second circuit containing a mineral rectifier the mineral being one of a group having the property of acting as a negative resistance when subjected to a certain voltage, and a source of potential connected to the rectifier.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Thermistors And Varistors (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US20902A 1924-04-09 1925-04-06 Radioreceiver Expired - Lifetime US1746796A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9039/24A GB236648A (en) 1924-04-09 1924-04-09 Improvements in radio receivers

Publications (1)

Publication Number Publication Date
US1746796A true US1746796A (en) 1930-02-11

Family

ID=9864206

Family Applications (1)

Application Number Title Priority Date Filing Date
US20902A Expired - Lifetime US1746796A (en) 1924-04-09 1925-04-06 Radioreceiver

Country Status (4)

Country Link
US (1) US1746796A (xx)
FR (1) FR596490A (xx)
GB (1) GB236648A (xx)
NL (1) NL18604C (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901613A (en) * 1957-08-05 1959-08-25 Hubert H Patterson Detector for modulated and unmodulated signals

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794917A (en) * 1953-01-27 1957-06-04 Bell Telephone Labor Inc High frequency negative resistance device
DE1101622B (de) * 1956-01-03 1961-03-09 Csf Halbleiterdiode mit einem PI- oder NI-UEbergang im Halbleiterkoerper
US3125725A (en) * 1959-07-20 1964-03-17 chang
US3061786A (en) * 1960-01-27 1962-10-30 Rca Corp Signal translating circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2901613A (en) * 1957-08-05 1959-08-25 Hubert H Patterson Detector for modulated and unmodulated signals

Also Published As

Publication number Publication date
GB236648A (en) 1925-07-09
FR596490A (fr) 1925-10-24
NL18604C (xx)

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