GB243371A - Improvements in or relating to wireless receivers of the heterodyne type - Google Patents

Improvements in or relating to wireless receivers of the heterodyne type

Info

Publication number
GB243371A
GB243371A GB29246/25A GB2924625A GB243371A GB 243371 A GB243371 A GB 243371A GB 29246/25 A GB29246/25 A GB 29246/25A GB 2924625 A GB2924625 A GB 2924625A GB 243371 A GB243371 A GB 243371A
Authority
GB
United Kingdom
Prior art keywords
filter
frequency
pass
output
valve
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
GB29246/25A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB243371A publication Critical patent/GB243371A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies

Abstract

243,371. Marconi's Wireless Telegraph Co., Ltd., (Assignees of Goldsmith, A. N., and Dyck, A. F. van). Nov. 20, 1924, [Convention date]. Coupling aerial and detector circuits; thermionic amplifiers and detectors; tuning apparatus, control of.-In a receiver of the heterodyne type the signals are passed through a filter before the local oscillations are superimposed upon them so that the required beat frequency can be obtained only with signals of the desired frequency. Fig. 3 shows a supersonic receiver in which the tuning condenser 22, the filter condensers 24, and the local oscillator condenser 28 are simultaneously adjusted. The output from the filter C is applied to an amplifying valve 25 the output of which is applied through condenser 27<1> to the grid of detecting and oscillating valve 26. The output of valve 26 is reflexed back through transformer 29 to the valve 25 for which the output is transformer 33. The filter C may be of the high-pass, low-pass or band type and the heterodyne frequency is so arranged that according as the filter is high-pass or low-pass this frequency is below or above the signal frequency so that an interfering signal which will produce the same beat frequency is cut off by the filter. In modifications separate and auto-heterodynes are employed to produce a beat note directly.
GB29246/25A 1924-11-20 1925-11-19 Improvements in or relating to wireless receivers of the heterodyne type Expired GB243371A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US751031A US1712036A (en) 1924-11-20 1924-11-20 Electrical signaling system and signaling method

Publications (1)

Publication Number Publication Date
GB243371A true GB243371A (en) 1926-06-24

Family

ID=25020185

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29246/25A Expired GB243371A (en) 1924-11-20 1925-11-19 Improvements in or relating to wireless receivers of the heterodyne type

Country Status (4)

Country Link
US (1) US1712036A (en)
FR (1) FR243371A (en)
GB (1) GB243371A (en)
NL (1) NL18312C (en)

Also Published As

Publication number Publication date
US1712036A (en) 1929-05-07
FR243371A (en)
NL18312C (en)

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