GB436856A - Improvements in and relating to radio receivers - Google Patents
Improvements in and relating to radio receiversInfo
- Publication number
- GB436856A GB436856A GB502734A GB502734A GB436856A GB 436856 A GB436856 A GB 436856A GB 502734 A GB502734 A GB 502734A GB 502734 A GB502734 A GB 502734A GB 436856 A GB436856 A GB 436856A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- circuit
- resistance
- signal
- 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
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
- H03G3/26—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems
Abstract
436,856. Valve circuits for wireless reception. FERRANTI, Ltd., and TAYLOR, M. K., Hollinwood, Lancashire. Feb. 15, 1934, No. 5027. [Class 40 (v)] Relates to receivers embodying automatic volume control and including means for inter-channel noise suppression and comprises the provision of a common ohmic resistance in the anode-cathode circuit of a noise suppressor valve and a low frequency amplifier valve and also included in the grid biassing circuit of the latter. In one embodiment, the diode portion of a valve V1, Fig. 1, is fed with signals from a circuit LC, the demodulated component of its output, developed across the load resistance b, being applied through a condenser d to the grid e of the triode portion for low frequency amplification. Bias for the grid e is due to the cathode resistance f which carries also the anode current of a compensating valve V2, the grid of which is connected to a tapping h on the resistance b. When no signal is being received the valve V2 passes a large current through resistance f to block the grid of valve V1. When a signal is being rectified by the diode the grid of valve V2 is rendered negative its anode current drops and the grid bias of valve V1 attains a value permitting normal amplification. In a modification the grid bias of the valve V1 may be in part due to a potential divider connected across the plate supply. In another embodiment the valve V2 is arranged to oscillate and so pass a large anode current during the no-signal periods. The variable grid bias for the compensating valve may be derived by the rectification of a specially produced intermediate frequency. Thus the valve V2, Fig. 4, is biassed by the potential due to the load resistance w of a rectifier R fed from an I.F. circuit L3, C3, associated with the anode circuit of a heptode frequency changer V3, fed with signals from the circuit LC through a condenser q. Alternatively the valve V2 may itself act as the rectifier of the I.F. signal. Specification 405,124<*> is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB502734A GB436856A (en) | 1934-02-15 | 1934-02-15 | Improvements in and relating to radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB502734A GB436856A (en) | 1934-02-15 | 1934-02-15 | Improvements in and relating to radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB436856A true GB436856A (en) | 1935-10-15 |
Family
ID=9788358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB502734A Expired GB436856A (en) | 1934-02-15 | 1934-02-15 | Improvements in and relating to radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB436856A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2586230A (en) * | 1945-07-20 | 1952-02-19 | Cornell Dubilier Electric | Inverter amplifier and automatic limiter |
-
1934
- 1934-02-15 GB GB502734A patent/GB436856A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2586230A (en) * | 1945-07-20 | 1952-02-19 | Cornell Dubilier Electric | Inverter amplifier and automatic limiter |
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