US1245267A - Radio telgraphy and telephony receiver. - Google Patents

Radio telgraphy and telephony receiver. Download PDF

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Publication number
US1245267A
US1245267A US55370A US5537015A US1245267A US 1245267 A US1245267 A US 1245267A US 55370 A US55370 A US 55370A US 5537015 A US5537015 A US 5537015A US 1245267 A US1245267 A US 1245267A
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United States
Prior art keywords
radio
telgraphy
detector
telephony receiver
coil
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
US55370A
Inventor
Greenleaf Whittier Pickard
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.)
WIRELESS SPECIALTY APPARATUS Co
Original Assignee
WIRELESS SPECIALTY APPARATUS Co
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Filing date
Publication date
Priority claimed from US82784514A external-priority patent/US1184376A/en
Application filed by WIRELESS SPECIALTY APPARATUS Co filed Critical WIRELESS SPECIALTY APPARATUS Co
Priority to US55370A priority Critical patent/US1245267A/en
Application granted granted Critical
Publication of US1245267A publication Critical patent/US1245267A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
    • H03J3/08—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
    • 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
    • H04B1/26—Circuits for superheterodyne receivers
    • H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes

Definitions

  • This invention relates to improvements in receiving apparatus for radio telegraphy and telephony, and consists of the apparatus and arrangements thereof disclosed herein, the object of the invention being to provide simplified and more eflicient apparatus.
  • the receiving coil P is preferably a long coil, so that there will be a long overhanging portion, as at the left of the adjustable connection with antenna A.
  • the other end of this over-hanging portion is connected to one terminal of the detector D, around which is connected telephone T.
  • the other terminal of detector D is connected to along coil S which does not necessarily have any coupling with respect. to primary coil P.
  • the operator adjusts the arrow connection from antenna A, and makes any desirable usual detector D adjustments, until 1 e obtains the best results from any given transmission, as indicated by telephone T.
  • the detector D is preferably of a type having high resistance and best operated by a current of high potential, and connected as it is to one end 0 coil P, it is subjected to the large potential changes thereat.
  • the detector may be any of the so-called crystal rectifiers, particularly those of high resistance, such as my silicon detector; or it may be any other suitable detector.
  • a radio receiving system the combination with a receiving coil acting as a transformer, of an open circuited coil connected therewith by way of a detector, substantially as and for the purpose described.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)

Description

G. W.,PICKARD.'
RADIO TELEGRAPHY AND TELEPHONY RECEIVEIM APPLICATION FILED OCT. 12. 19!.5.
1 45,267 Patented Nov. 6, 1917.
Attest: In Ve tor:
M W y Q/QAMAI WW 0 W m/ M.. Attyv v UNITED STATES PATENT OFFICE.
GREENLEAF WHITTIER PICKARD, OF AMESBITRY, MASSAOHUSETTS, ASSIGNOR TO WIRELESS SPECIALTY APPARATUS COMPANY, OF BOSTON, MASSACHUSETTS, A COB.-v
PORATION OF NEW YORK.
Original application filed March 28, 1914, Serial No. 827,845.
Specification of Letters Patent.
Patent No. 1,184,376, dated May 23, 1916.
Divided and this application filed October 1 2, 1915. Serial No. 55,370.
To all whom it may concern:
Be it known that I, GREENLEAF WHITTIER PICKARD, a citizen of the United States of America, and a resident of the town of Amesbury, Massachusetts, have invented certain new and useful Improvements in Radio Telegraphy and Telephony Receivers, the principles of which are set forth in the following specification and accompanying drawings, which disclose the form of the invention which I now consider to be the best of the various forms in which the principles of the invention may be embodied.
This invention relates to improvements in receiving apparatus for radio telegraphy and telephony, and consists of the apparatus and arrangements thereof disclosed herein, the object of the invention being to provide simplified and more eflicient apparatus.
In the drawings, the figure is a diagrammatic illustration of one embodiment of the invention. I
The receiving coil P is preferably a long coil, so that there will be a long overhanging portion, as at the left of the adjustable connection with antenna A. The other end of this over-hanging portion is connected to one terminal of the detector D, around which is connected telephone T. The other terminal of detector D is connected to along coil S which does not necessarily have any coupling with respect. to primary coil P.
While it is not necessary to varythe inductance of coil S, it may sometimes be found advantageous to wind this permanently for resonance with a desired wave length.
I In use, the operator adjusts the arrow connection from antenna A, and makes any desirable usual detector D adjustments, until 1 e obtains the best results from any given transmission, as indicated by telephone T.
The detector D is preferably of a type having high resistance and best operated by a current of high potential, and connected as it is to one end 0 coil P, it is subjected to the large potential changes thereat. The detector may be any of the so-called crystal rectifiers, particularly those of high resistance, such as my silicon detector; or it may be any other suitable detector.
This application is a division of my application Serial Number 827,845 filed March 28, 1914, granted as Patent Number 1,184,376, May 23, 1916.
In a radio receiving system, the combination with a receiving coil acting as a transformer, of an open circuited coil connected therewith by way of a detector, substantially as and for the purpose described.
GREENLEAF WHITTIER PICKARD.
Witnesses:
W. R. WARNER, LOUISE M. BRUNS..
Patented Nov. 6, 1917.
US55370A 1914-03-28 1915-10-12 Radio telgraphy and telephony receiver. Expired - Lifetime US1245267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US55370A US1245267A (en) 1914-03-28 1915-10-12 Radio telgraphy and telephony receiver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82784514A US1184376A (en) 1914-03-28 1914-03-28 Radio telegraphy and telephony receiver.
US55370A US1245267A (en) 1914-03-28 1915-10-12 Radio telgraphy and telephony receiver.

Publications (1)

Publication Number Publication Date
US1245267A true US1245267A (en) 1917-11-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US55370A Expired - Lifetime US1245267A (en) 1914-03-28 1915-10-12 Radio telgraphy and telephony receiver.

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US (1) US1245267A (en)

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