GB468172A - Improvements in or relating to radio receiving and other modulated carrier wave apparatus - Google Patents
Improvements in or relating to radio receiving and other modulated carrier wave apparatusInfo
- Publication number
- GB468172A GB468172A GB28430/36A GB2843036A GB468172A GB 468172 A GB468172 A GB 468172A GB 28430/36 A GB28430/36 A GB 28430/36A GB 2843036 A GB2843036 A GB 2843036A GB 468172 A GB468172 A GB 468172A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplitude
- circuits
- frequency
- tuned
- modulation
- 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
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/12—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of discharge tubes having more than two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Radio Relay Systems (AREA)
Abstract
468,172. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 19,1936, No. 28430. Convention date, Oct. 17, 1935. [Class 40 (v)] In a method of converting frequency modulation to amplitude modulation, use is made of reactive circuits so tuned that the substantially rectilinear portions of their resonance curves intersect at the carrier wave frequency of the modulated wave to be handled. The signal is passed by normal receiving apparatus 2, 4, Fig. 1, through an amplitude limiter 6 and is applied in parallel to the control grids of the amplifying valves 8, 10 in whose anode circuits are circuits 12 tuned just below and 14 tuned just above the lowest and highest frequencies present in the modulated wave. Similarly circuit 16 resonates above the highest and 18 below the lowest frequency. The outputfrequency response from circuits 16, 18 is shown at A, B in Fig. 2 ; FC being the mean carrier frequency. The signals applied to the grids of the detectors 20, 22 are thus amplitude modulated, the outputs being combined in push-pull in T, amplitude and second harmonic distortion being balanced out. If switch RS is operated and the outputs are combined in parallel, amplitude modulation is received and frequency modulation balanced out.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US468172XA | 1935-10-17 | 1935-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB468172A true GB468172A (en) | 1937-06-30 |
Family
ID=21945546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28430/36A Expired GB468172A (en) | 1935-10-17 | 1936-10-19 | Improvements in or relating to radio receiving and other modulated carrier wave apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB468172A (en) |
-
1936
- 1936-10-19 GB GB28430/36A patent/GB468172A/en not_active Expired
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