GB661957A - Improvements relating to amplitude modulated radio transmitters - Google Patents
Improvements relating to amplitude modulated radio transmittersInfo
- Publication number
- GB661957A GB661957A GB29476/48A GB2947648A GB661957A GB 661957 A GB661957 A GB 661957A GB 29476/48 A GB29476/48 A GB 29476/48A GB 2947648 A GB2947648 A GB 2947648A GB 661957 A GB661957 A GB 661957A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- resistor
- modulator
- transmitter
- unwanted harmonics
- 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
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/02—Details
- H03C1/06—Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator
Landscapes
- Transmitters (AREA)
Abstract
661,957. Modulating apparatus; valve amplifying circuits. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Nov. 12, 1948 [Nov. 17, 1947], No. 29476/48. Classes 40 (v) and 40 (vi). The final low-frequency amplifier of a radio transmitter is coupled to the modulator through a circuit arranged to filter off unwanted harmonics of the audio signals to an auxiliary loading resistor, and to present a substantially constant impedance to the amplifier over the useful audio frequency range. As shown, the final L.F. amplifier 3 is coupled to the modulator and R.F. stages of a transmitter by a circuit comprising a shunt capacitor 9 in series with a resistor 10 and a series inductor 8. The values R, L and C of the resistor 10, inductor 8 and capacitor 9 are chosen so that R = #C/C, and R is substantially equal to the input resistance of the modulator 7. This ensures that a constant impedance is presented to the output of the amplifier, while unwanted harmonics are dissipated in the resistor 10. Part of the modulated output of the transmitter is rectified at 11 to give an overall feed-back, which is combined at 13 with unwanted harmonics taken from a tap 12 on the resistor 10 and fed through an amplifier 15 to the input of the low-frequency amplifier.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR661957X | 1947-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB661957A true GB661957A (en) | 1951-11-28 |
Family
ID=9011216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29476/48A Expired GB661957A (en) | 1947-11-17 | 1948-11-12 | Improvements relating to amplitude modulated radio transmitters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB661957A (en) |
-
1948
- 1948-11-12 GB GB29476/48A patent/GB661957A/en not_active Expired
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