GB563620A - Frequency selective network - Google Patents

Frequency selective network

Info

Publication number
GB563620A
GB563620A GB12241/42A GB1224142A GB563620A GB 563620 A GB563620 A GB 563620A GB 12241/42 A GB12241/42 A GB 12241/42A GB 1224142 A GB1224142 A GB 1224142A GB 563620 A GB563620 A GB 563620A
Authority
GB
United Kingdom
Prior art keywords
circuits
output
frequency
resonant circuit
input
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
GB12241/42A
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
Application filed by Individual filed Critical Individual
Publication of GB563620A publication Critical patent/GB563620A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H03H7/0169—Intermediate frequency filters

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

563,620. Telephone transmission systems. WHITE, S. Y. Aug. 3], 1942, No. 12241. Convention date, April 1, 1942. [Class 40 (iv)] [Also in Group XL] A frequency selective transmission network comprises in combination, a tube of limited power handling ability connected to a resonant circuit having a low ratio of inductance to resistance, and a detecting device deriving its control electrode potential directly from a terminal of said resonant circuit and insensitive to applied voltage below a predetermined threshold value, whereby the ratio between the selectivity and the number of cycles required to build up to full amplitude in the output of said network is markedly increased over the ratio inherent in any resonant circuit alone. As shown in Fig. 1, circuits TC3, TC4 tuned to a predetermined tonal frequency and having a low Q are optimum coupled to give high selectivity. The input to the circuits is fed through a limiter VT7 and the output is fed to a detector VT9 having a preset positive bias 20 applied to the cathode. The direct voltage appearing across load resistor R11, after filtering at R12, C8 is available for control purposes at terminals 21. If an input, applied from source 10, is of the predetermined frequency, the circuits TC3, TC4 rapidly build up to an amplitude sufficient to overcome the bias 20 and provide an output at 21. For any other frequency, however, the combined effect of the limiter VT7 and tuned circuits TC3, TC4 is such that the input to the detector VT9 is insufficient to overcome the bias 20 and no output appears at 21. Fig. 3 shows a mechanical embodiment suitable for use as the tuned circuits TC3, TC4. Brass strips 39 mounted on an insulating base 36, support insulating shelves 41, 43, 48, 49 between which are mounted coils 12, 14 having dust iron cores, and tuning condensers 13, 15 adjustable by screws 52. The whole is enclosed by a screening can and is provided with plug-in terminals 38. Specification 549,7.70, [Group XL], is referred to.
GB12241/42A 1942-04-01 1942-08-31 Frequency selective network Expired GB563620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US563620XA 1942-04-01 1942-04-01

Publications (1)

Publication Number Publication Date
GB563620A true GB563620A (en) 1944-08-23

Family

ID=22003890

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12241/42A Expired GB563620A (en) 1942-04-01 1942-08-31 Frequency selective network

Country Status (1)

Country Link
GB (1) GB563620A (en)

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