SU146808A1 - Method of receiving phototelegraphic signals during radio communication with the transmission of one sideband - Google Patents
Method of receiving phototelegraphic signals during radio communication with the transmission of one sidebandInfo
- Publication number
- SU146808A1 SU146808A1 SU656029A SU656029A SU146808A1 SU 146808 A1 SU146808 A1 SU 146808A1 SU 656029 A SU656029 A SU 656029A SU 656029 A SU656029 A SU 656029A SU 146808 A1 SU146808 A1 SU 146808A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- receiving
- phototelegraphic
- sideband
- transmission
- frequency
- Prior art date
Links
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- Optical Communication System (AREA)
- Mobile Radio Communication Systems (AREA)
Description
СПОСОБ ПРИЕМА ФОТОТЕЛЕГРАФНЫХ СИГНАЛОВ ПРИ РАДИОСВЯЗИ С ПЕРЕДАЧЕЙ ОДНОЙ БОКОВОЙ ПОЛОСЫ ЧАСТОТMETHOD OF RECEIVING PHOTO TELEGRAPH SIGNALS UNDER RADIO CONNECTION WITH TRANSMISSION OF ONE SIDE BAND OF FREQUENCIES
За влено 24 феврал 1960 г. за Л 656029/26 в Комитет по дела.м нзобретенин и открытий при Совете Министров СССРFebruary 24, 1960, for L 656029/26, to the Committee on the case of inquisition and discoveries at the Council of Ministers of the USSR
Опубликовано в «Бюллетене изобретений .N 9 за 1962 г.Published in the “Bulletin of inventions .N 9 for 1962
Известны способы приема фототелеграфных сигналов с передачей одной баковой полосы частот путем восстановлени несущей частоты в точке приема и выделени низкой частоты детектированием поднесущей .Methods are known for receiving phototelegraphic signals with transmission of one tank band by restoring the carrier frequency at the receiving point and selecting the low frequency by detecting the subcarrier.
Описываемый способ отличаетс от известных тем, что в точке приема остаток несущей частоты полностью .подавл ют, а вы вление сигнала низкой частоты осуществл ют путем частотного детектировани спектра переданной одной боковой полосы частот, выделенной фильтрами приемника. Это повышает качество приема фототелеграфных сигналов при использовании стандартных коротковолновых магистральных приемников.The described method differs from the known ones in that at the reception point the rest of the carrier frequency is completely suppressed, and the low frequency signal is detected by frequency detection of the spectrum of the transmitted one sideband allocated by the receiver filters. This improves the reception quality of phototelegraphic signals using standard short-wave trunk receivers.
Сущность способа состоит в следующем.The essence of the method is as follows.
Приемник настраиваетс на середину боковой полосы частот однополосной передачи. Полоса пропускаемых частот беретс не шире необходимой дл приема полезного сигнала. Остаток несущей подавл ют фильтрами промежуточной частоты. При необходимости дл подавлени несущей можно использовать режекторный фильтр, включенный в тракт промежуточной частоты. На выходе усилител промежуточной частоты .приемника получают полезный частотно-модулированный фототелеграфный сигнал, который детектируют известными способами.The receiver is tuned to the middle of the sideband of a single sideband transmission. The band of transmitted frequencies is not wider than necessary to receive a useful signal. The remainder of the carrier is suppressed by intermediate frequency filters. If necessary, a notch filter included in the intermediate frequency path can be used to suppress the carrier. At the output of the intermediate-frequency amplifier of the receiver, a useful frequency-modulated phototelegraphic signal is obtained, which is detected by known methods.
Если приемник снабжен оконечным устройством дл приема фототелеграфных сигналов, переданных способом частотной модул ции несущей передатчика, то детектирование осуществл ют так же, как и в случае приема обычных частотно-модулированных фототелеграфных сигналов.If the receiver is equipped with a terminal device for receiving photo-telegraphic signals transmitted by the method of frequency modulation of the carrier of the transmitter, the detection is carried out in the same way as in the case of receiving conventional frequency-modulated photo-telegraphic signals.
№ 146808No. 146808
Если приемник е имеет устройства дл приема ЧМ сигналов, то примен ют еще одну ступень преобразовани частоты. Промежуточна частота .понижаетс до стандартной поднесущей частоты. После этого частотное детектирование осуществл ют обычным способом.If the receiver has devices for receiving FM signals, then another frequency conversion step is used. The intermediate frequency is reduced to the standard subcarrier frequency. Thereafter, frequency detection is carried out in the usual manner.
Описанный способ приема может быть широко использован на радиофототелеграфных св з х большой прот женности.The described method of reception can be widely used on radiophototelegraphic links of great extent.
Предмет изобретени Subject invention
Способ приема фототелеграфных сигналов при радиосв зи с передачей одной боковой полосы частот и частотной модул цией поднесущей , отличаюшийс тем, что, с целью повышени качества приема указанных сигналов на стандартные коротковолновые магистральные приемники, в .приемнике производ т полное подавление несущей и выдел ют полезный спектр частотно-модулировапной поднесущей. фильтрами приемника с последующим детектированием поднесущей частотным детектором.The method of receiving phototelegraphic signals during radio communication with the transmission of one sideband and subcarrier frequency modulation, characterized in that, in order to improve the reception quality of these signals to standard short-wave backbone receivers, the receiver produces full carrier suppression and allocates useful spectrum frequency modulated subcarrier. receiver filters followed by subcarrier detection by a frequency detector.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU656029A SU146808A1 (en) | 1960-02-24 | 1960-02-24 | Method of receiving phototelegraphic signals during radio communication with the transmission of one sideband |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU656029A SU146808A1 (en) | 1960-02-24 | 1960-02-24 | Method of receiving phototelegraphic signals during radio communication with the transmission of one sideband |
Publications (1)
Publication Number | Publication Date |
---|---|
SU146808A1 true SU146808A1 (en) | 1961-11-30 |
Family
ID=48302236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU656029A SU146808A1 (en) | 1960-02-24 | 1960-02-24 | Method of receiving phototelegraphic signals during radio communication with the transmission of one sideband |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU146808A1 (en) |
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1960
- 1960-02-24 SU SU656029A patent/SU146808A1/en active
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