SU119551A1 - Method for improving noise immunity of superheterodyne receiver - Google Patents
Method for improving noise immunity of superheterodyne receiverInfo
- Publication number
- SU119551A1 SU119551A1 SU576689A SU576689A SU119551A1 SU 119551 A1 SU119551 A1 SU 119551A1 SU 576689 A SU576689 A SU 576689A SU 576689 A SU576689 A SU 576689A SU 119551 A1 SU119551 A1 SU 119551A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- noise immunity
- superheterodyne receiver
- improving noise
- tuning
- local oscillator
- Prior art date
Links
Landscapes
- Superheterodyne Receivers (AREA)
Description
Известны способы повышени помехоустойчивости супергетеродинного приемника путем применени в нем двойного преобразовани частоты . Настройка подобных приемников производитс путем изменени рабочей частоты второго гетеродина при одновременной перестройке резонансной частоты контуров первого усилител промежуточной частоты . При подобном способе настройки не удаетс избавитьс от некоторых мощных помех, принимаемых на комбинационной частоте, равной промежуточной и образованной при алгебраическом суммировании некоторых гармоник мешающего сигнала и высших гармоник колебаний первого гетеродина. Описываемый способ позвол ет уменьшить уровень помех по комбинационному каналу. Это достигаетс путем одновременной перестройки обоих гетеродинов и фильтра усилител первой промежуточной частоты, включенного между первым и вторым смесител ми. При изменении частот гетеродинов на Д/ на эту же величину измен етс и перва промежуточна частота, в то врем как преобразованна частота помехи изменитс на п АД где п - номер гармоники гетеродина , создающий данный комбинационный канал приема. В результате уровень помехи, поступающей на второй смеситель, удаетс уменьщить, а следовательно, повысить помехоустойчивость приемника.Methods are known for improving the noise immunity of a superheterodyne receiver by employing double frequency conversion therein. Tuning such receivers is done by changing the operating frequency of the second local oscillator while simultaneously tuning the resonant frequency of the circuits of the first intermediate frequency amplifier. With this method of tuning, it is not possible to get rid of some powerful interference received at the combination frequency equal to the intermediate one and formed during the algebraic summation of some harmonics of the interfering signal and higher harmonics of the oscillations of the first local oscillator. The described method makes it possible to reduce the level of interference over the combination channel. This is achieved by simultaneously tuning both the local oscillators and the filter of the first intermediate frequency amplifier connected between the first and second mixers. When the frequencies of the local oscillators change by D /, the first intermediate frequency also changes by the same amount, while the converted interference frequency changes to n HELL where n is the number of the harmonic of the local oscillator that creates this combinational receive channel. As a result, the level of interference to the second mixer can be reduced, and consequently, the noise immunity of the receiver can be increased.
Предмет изобретени Subject invention
Способ повышени помехоустойчивости супергетеродинного приемника с двойным преобразованием частоты и сопр женной настройкой второго гетеродина и контуров первого усилител промежуточной частоты , отличающийс тем, что, с целью уменьшени уровн помех по комбинационному каналу, при настройке на станцию синхронно с перестройкой второго гетеродина и контуров первого усилител промежуточной частоты, производ т перестройку первого гетеродина.A method for improving the noise immunity of a superheterodyne receiver with double frequency conversion and conjugate tuning of the second local oscillator and loops of the first intermediate frequency amplifier, characterized in that, in order to reduce the level of interference on the combinational channel, when tuned to the station synchronously with the tuning of the second heterodyne and the loops of the first amplifier frequencies, rebuilds the first local oscillator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU576689A SU119551A1 (en) | 1955-09-17 | 1955-09-17 | Method for improving noise immunity of superheterodyne receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU576689A SU119551A1 (en) | 1955-09-17 | 1955-09-17 | Method for improving noise immunity of superheterodyne receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
SU119551A1 true SU119551A1 (en) | 1958-11-30 |
Family
ID=48391500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU576689A SU119551A1 (en) | 1955-09-17 | 1955-09-17 | Method for improving noise immunity of superheterodyne receiver |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU119551A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014042689A1 (en) * | 2012-09-13 | 2014-03-20 | Grazel Alfred | A circuit configuration using a frequency converter to achieve tunable circuit components such as filters and amplifiers |
-
1955
- 1955-09-17 SU SU576689A patent/SU119551A1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014042689A1 (en) * | 2012-09-13 | 2014-03-20 | Grazel Alfred | A circuit configuration using a frequency converter to achieve tunable circuit components such as filters and amplifiers |
US9543895B2 (en) | 2012-09-13 | 2017-01-10 | Alfred Grayzel | Circuit configuration using a frequency converter to achieve tunable circuit components such as filters and amplifiers |
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