GB684058A - Improvements in or relating to frequency changers for radio receivers - Google Patents
Improvements in or relating to frequency changers for radio receiversInfo
- Publication number
- GB684058A GB684058A GB130651A GB130651A GB684058A GB 684058 A GB684058 A GB 684058A GB 130651 A GB130651 A GB 130651A GB 130651 A GB130651 A GB 130651A GB 684058 A GB684058 A GB 684058A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- valve
- circuit
- tuned
- 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
- 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
- H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
684,058. Superheterodyne circuits. MULLARD RADIO VALVE CO., Ltd. Jan. 17, 1951, No. 1306/51. Classes 40 (v) and 40 (vi). A self-oscillating frequency-changer comprises a valve 9 having a parallel resonant circuit 13 tuned to the oscillator frequency, connected between grid and earth, a signal source supplying a second resonant circuit 5, 8 tuned to signal frequency and connected between the cathode and earth, while intermediate frequency output is taken from a further tuned circuit 10 connected to the anode of the valve. The signal frequency is lower than the local oscillator frequency, so that at the latter the circuit 5, 8 presents a capaciattive impedance, which in conjunction with the gridcathode capacity of the valve 9 causes the valve to present a negative resistance to the circuit 13 whereby oscillations are generated. Grid condenser 11 is selected to resonate with the circuit 13 at signal frequency so that the grid is effectively grounded at this frequency. The signal source comprises a triode amplifier 6 having the circuit 5, 8 as anode load, the anodegrid capacity of this valve being tuned out at signal frequency by means of inductance 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB130651A GB684058A (en) | 1951-01-17 | 1951-01-17 | Improvements in or relating to frequency changers for radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB130651A GB684058A (en) | 1951-01-17 | 1951-01-17 | Improvements in or relating to frequency changers for radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB684058A true GB684058A (en) | 1952-12-10 |
Family
ID=9719694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB130651A Expired GB684058A (en) | 1951-01-17 | 1951-01-17 | Improvements in or relating to frequency changers for radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB684058A (en) |
-
1951
- 1951-01-17 GB GB130651A patent/GB684058A/en not_active Expired
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