GB426228A - Improvements in or relating to radio signalling - Google Patents

Improvements in or relating to radio signalling

Info

Publication number
GB426228A
GB426228A GB2436/34A GB243634A GB426228A GB 426228 A GB426228 A GB 426228A GB 2436/34 A GB2436/34 A GB 2436/34A GB 243634 A GB243634 A GB 243634A GB 426228 A GB426228 A GB 426228A
Authority
GB
United Kingdom
Prior art keywords
variations
hiss
represented
frequency
jan
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
Application number
GB2436/34A
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.)
Individual
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24620034&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB426228(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of GB426228A publication Critical patent/GB426228A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal

Abstract

426,228. Wireless signalling. ARMSTRONG, E. H., 211, Central Park West, New York, U.S.A. Jan. 24, 1934, No. 2436. Convention date, Jan. 24, 1933. [Class 40 (v)] Relates to means for reducing the ratio of valve " hiss " to signal strength, particularly in shortwave signalling. A wide band of frequency modulation is used, in combination with currentlimiters, and the signal is received on a circuit Fig. 2, comprising a pair of balanced detectors 56, 57, of the same general type as that described in Specification 290,642, which respond cumulatively to frequency-modulated variations and differentially to any amplitude variations. Assuming that an unmodulated carrier of 200 K.C., Fig. 5, is being received, audible valve " hiss " arising from filament variations is limited to the range from 190 to 210 K.C., and since the " reactance " characteristics of the two input circuits 52, 54 and 53, 55, Fig. 2, (represented by the curves AB and CD in Fig. 5) are equal and opposite this effect is wiped out. Hiss due to frequency variations is represented by OP-OQ, Fig. 5, plus OS-OR or PQ + SR in all, whilst signal strength is represented by OM<1>+ON<1>. On a six-metre wave it is stated that tube noise is reduced by this method to one per cent of that normally experienced. Specification 426,227 also is referred to.
GB2436/34A 1933-01-24 1934-01-24 Improvements in or relating to radio signalling Expired GB426228A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US653237A US1941069A (en) 1933-01-24 1933-01-24 Radiosignaling

Publications (1)

Publication Number Publication Date
GB426228A true GB426228A (en) 1935-03-29

Family

ID=24620034

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2436/34A Expired GB426228A (en) 1933-01-24 1934-01-24 Improvements in or relating to radio signalling
GB2435/34A Expired GB426227A (en) 1933-01-24 1934-01-24 Improvements in or relating to radio signalling

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB2435/34A Expired GB426227A (en) 1933-01-24 1934-01-24 Improvements in or relating to radio signalling

Country Status (6)

Country Link
US (1) US1941069A (en)
BE (1) BE433916A (en)
DE (1) DE924809C (en)
FR (1) FR771091A (en)
GB (2) GB426228A (en)
NL (1) NL44760C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB509820A (en) * 1937-11-19 1939-07-19 Edmond Maurice Deloraine Improvements in or relating to electric signalling systems
BE480549A (en) * 1938-11-12
DE927749C (en) * 1942-05-12 1955-05-16 Studiengesellschaft Fuer Elekt Circuit arrangement for limiting the amplitude
DE972138C (en) * 1943-12-31 1959-05-27 Funkstrahl Ges Fuer Nachrichte Arrangement for limiting the amplitude of alternating voltages, in particular of frequency-modulated oscillations
DE1277375B (en) * 1964-11-06 1968-09-12 Te Ka De Fernmeldeapp G M B H Method for frequency modulation of relatively low carrier frequencies, especially in the km wave range

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE361387C (en) * 1920-02-28 1922-10-13 Marconi Wireless Telegraph Co Wireless telephony transmitter
DE424239C (en) * 1920-08-31 1926-01-22 Siemens & Halske Akt Ges Method for wireless high frequency telephony
US1599586A (en) * 1922-04-27 1926-09-14 John Hays Hammond Jr Radiant signaling system
US1885826A (en) * 1926-12-08 1932-11-01 American Telephone & Telegraph System of photography employing frequency modulation
GB290642A (en) * 1927-05-18 1929-07-18 Edwin Howard Armstrong Improvements in radio telephone signalling
US1941447A (en) * 1927-05-18 1933-12-26 Edwin H Armstrong Radio telephone signaling
US1819508A (en) * 1927-08-11 1931-08-18 Rca Corp Communication by frequency variation
US1872364A (en) * 1927-10-08 1932-08-16 Westinghouse Electric & Mfg Co Radiotransmitting system
US1867567A (en) * 1929-02-01 1932-07-19 Rca Corp Detection of frequency modulated signals
US1917102A (en) * 1929-07-22 1933-07-04 Gen Electric Frequency modulation

Also Published As

Publication number Publication date
DE924809C (en) 1955-03-07
FR771091A (en) 1934-09-29
NL44760C (en) 1900-01-01
BE433916A (en)
US1941069A (en) 1933-12-26
GB426227A (en) 1935-03-29

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