GB630802A - Improvements in or relating to mixing circuits for the production of combination frequencies - Google Patents
Improvements in or relating to mixing circuits for the production of combination frequenciesInfo
- Publication number
- GB630802A GB630802A GB10868/47A GB1086847A GB630802A GB 630802 A GB630802 A GB 630802A GB 10868/47 A GB10868/47 A GB 10868/47A GB 1086847 A GB1086847 A GB 1086847A GB 630802 A GB630802 A GB 630802A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- impedance
- signal
- pulse train
- circuit
- 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
- H03D7/10—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 different pairs of electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
630,802. Frequency measurements. PHILIPS LAMPS, Ltd. April 23, 1947, No. 10868. Convention date, Sept. 2, 1944. [Class 37] [Also in Group XL (c)] In a mixing arrangement in which the signals to be mixed are applied respectively to the inner and outer grids of a multigrid valve, the outer grid is biassed so as to be conductive over part of the cycle and an impedance which is high at, the desired combination frequency is included in its circuit. The signal applied to the outer grid preferably consists of short periodic pulses. The impedance may comprise a tuned circuit (Fig. 1, not shown), or alternatively a network having an impedance which is substantially constant over a wide frequency range and comprises series resistance 13 and inductance 14 shunted by a condenser 15. The arrangement may be used to produce a wide range of frequencies by adjustment of the frequency of the signal 8 applied to the inner grid and by utilisation of the beats formed with the harmonics of the other signal. It may also be used for frequency measurement, the source 8 then comprising the unknown frequency. The term in the output due to beating with the nearest harmonic in the pulse train is selected by means of a low-pass filter in the anode circuit cutting-off at half the fundamental frequency of the pulse train, and is measured by known means such as comparison with a lowfrequency oscillator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL630802X | 1944-09-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB630802A true GB630802A (en) | 1949-10-21 |
Family
ID=19788730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10868/47A Expired GB630802A (en) | 1944-09-02 | 1947-04-23 | Improvements in or relating to mixing circuits for the production of combination frequencies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB630802A (en) |
-
1947
- 1947-04-23 GB GB10868/47A patent/GB630802A/en not_active Expired
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