GB243407A - Improvements in and relating to the employment of thermionic valve circuits - Google Patents
Improvements in and relating to the employment of thermionic valve circuitsInfo
- Publication number
- GB243407A GB243407A GB1752824A GB1752824A GB243407A GB 243407 A GB243407 A GB 243407A GB 1752824 A GB1752824 A GB 1752824A GB 1752824 A GB1752824 A GB 1752824A GB 243407 A GB243407 A GB 243407A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- oscillations
- circuit
- point
- recording device
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/06—Demodulator circuits; Receiver circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
243,407. Brydon, S., and Fletcher, D. B. July 22, 1924. Thermionic amplifiers and detectors. - A back coupled valve is set at the " threshold " point withou appreciable backlash, so that it generates high-frequency oscillations contem porary with the incoming signals, the corresponding anode voltage-variations being applied to the grid and filament of a second valve, which contains a detecting or recording device in its plate circuit. The invention is distinguished from known arrangements which utilize changes in the value of direct, current in the anode circuit of a triggered valve, and from the super-regenerative circuits described in Specification 182,135. The first valve A is coupled through a condenser O, shunted by a resistance q, to the valve B which feeds a recording device R or a pair of phones. The proper setting of the valve A on the threshold point is ascertained by varying the filament current and the coupling between the coils m and g against a step-by-step adjustment of a grid potentiometer h, i. The curve X, Fig. 2, represents the " oscillation " conditions, whilst Y corresponds to the cessation of oscillations, the distance between these curves indicating the degree of back lash present. For telephony reception the valve should be set near the converging point Z, whereas for Morse reception a certain amount of back lash is desirable as providing an impulsive effect, disproportionate to the signal voltage, in the recorder R. The frequency of the oscillations generated by the valve A is determined by the tuning of the circuit g, and may differ from that of the received signals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1752824A GB243407A (en) | 1924-07-22 | 1924-07-22 | Improvements in and relating to the employment of thermionic valve circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1752824A GB243407A (en) | 1924-07-22 | 1924-07-22 | Improvements in and relating to the employment of thermionic valve circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB243407A true GB243407A (en) | 1925-11-23 |
Family
ID=10096746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1752824A Expired GB243407A (en) | 1924-07-22 | 1924-07-22 | Improvements in and relating to the employment of thermionic valve circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB243407A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2657306A (en) * | 1943-03-13 | 1953-10-27 | Williams Frederic Calland | Radio receiving circuit arrangement |
-
1924
- 1924-07-22 GB GB1752824A patent/GB243407A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2657306A (en) * | 1943-03-13 | 1953-10-27 | Williams Frederic Calland | Radio receiving circuit arrangement |
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