GB628740A - Improvements in systems making use of electronic tubes, especially for frequency changing - Google Patents
Improvements in systems making use of electronic tubes, especially for frequency changingInfo
- Publication number
- GB628740A GB628740A GB9447/46A GB944746A GB628740A GB 628740 A GB628740 A GB 628740A GB 9447/46 A GB9447/46 A GB 9447/46A GB 944746 A GB944746 A GB 944746A GB 628740 A GB628740 A GB 628740A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- anode
- circuit
- valve
- frequency
- 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
Links
Classifications
-
- 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
- H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
- H03F1/14—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means
- H03F1/16—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements by use of neutralising means in discharge tube amplifiers
Abstract
628,740. Superheterodyne circuits. MERLES, A. J. March 27, 1946, No. 9447. Convention date, July 21, 1945. [Class 40 (v)] In a frequency - changing circuit local oscillations are applied to a grid 1 of the mixing-valve and signals are applied to the anode 6 via a tuned circuit, 7, both grid and anode being operated at substantially zero potential in order to reduce noise. The intermediate frequency is taken from the anode circuit by means of a tuned transformer 9. Local oscillations are generated by means of a second grid 2 back-coupled to the grid 1, the capacity coupling within the valve from grid 2 to anode being neutralized by a condenser 13 connected between grid 1 and anode.. Alternatively, Fig. 2 (not shown) oscillations may be derived from a separate oscillator, in which case the grid 2 is utilized as a screen. Further embodiments, Figs. 3, 4 (not shown) comprise respectively the use of the arrangement in a push-pull circuit and as beat-frequency oscillator in the reception of continuous waves. According to the Specification as open to inspection under Sect. 91 the signal may alternatively be applied to an outer grid of the mixing valve. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR628740X | 1945-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB628740A true GB628740A (en) | 1949-09-05 |
Family
ID=8989884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9447/46A Expired GB628740A (en) | 1945-07-21 | 1946-03-27 | Improvements in systems making use of electronic tubes, especially for frequency changing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB628740A (en) |
-
1946
- 1946-03-27 GB GB9447/46A patent/GB628740A/en not_active Expired
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