GB796017A - Improvements in or relating to frequency changers - Google Patents
Improvements in or relating to frequency changersInfo
- Publication number
- GB796017A GB796017A GB993555A GB993555A GB796017A GB 796017 A GB796017 A GB 796017A GB 993555 A GB993555 A GB 993555A GB 993555 A GB993555 A GB 993555A GB 796017 A GB796017 A GB 796017A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- frequency
- tuned
- valve
- coupled
- 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
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
- H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
796,017. Frequency-changing circuits. GENERAL ELECTRIC CO., Ltd., and DRYBROUGH, D. A. S. March 23, 1956 [April 5, 1955], No. 9935/55. Class 40 (6). A self-oscillating frequency-changer comprises a pentode with the local oscillator circuit 5, 6 connected between screen and control grids. The coil 6 is bifilar wound, with the centre-tap earthed over condenser 9, and is tuned by a movable ferromagnetic core. The signal input is injected by means of circuit 12, 13 which is tuned in a similar manner, and coupled to a fixed-tuned circuit 10, 11 in the cathode lead of the valve. The oscillator frequency is arranged on the higher side of the signal frequency and the circuit 10, 11 is tuned to the low-frequency end of the tuning range, thereby minimizing radiation of the local oscillations. In addition, the coils 6, 12 may be inductively coupled so as to "buck" any residual radiation. The intermediate frequency output is taken from a tuned circuit 14, 16 in the anode circuit of the valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB993555A GB796017A (en) | 1955-04-05 | 1955-04-05 | Improvements in or relating to frequency changers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB993555A GB796017A (en) | 1955-04-05 | 1955-04-05 | Improvements in or relating to frequency changers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB796017A true GB796017A (en) | 1958-06-04 |
Family
ID=9881496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB993555A Expired GB796017A (en) | 1955-04-05 | 1955-04-05 | Improvements in or relating to frequency changers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB796017A (en) |
-
1955
- 1955-04-05 GB GB993555A patent/GB796017A/en not_active Expired
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