DE478314C - Method for wireless communication with simultaneous modulation of the carrier wave in amplitude and frequency - Google Patents
Method for wireless communication with simultaneous modulation of the carrier wave in amplitude and frequencyInfo
- Publication number
- DE478314C DE478314C DET33145D DET0033145D DE478314C DE 478314 C DE478314 C DE 478314C DE T33145 D DET33145 D DE T33145D DE T0033145 D DET0033145 D DE T0033145D DE 478314 C DE478314 C DE 478314C
- Authority
- DE
- Germany
- Prior art keywords
- carrier wave
- frequency
- amplitude
- wireless communication
- simultaneous 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/12—Electrically-operated arrangements for indicating correct tuning
Landscapes
- Mobile Radio Communication Systems (AREA)
Description
Verfahren zur drahtlosen Nachrichtenübermittlung mit gleichzeitiger flodulierung der Trägerwelle in Amplitude und Frequenz. Die Erfindung betrifft ein System zur bestimmten Erkennung arbeitender Rundfunksender und beruht darauf, daß, die durch die Sprache in der Amplitude modulierte Trägerschwingung des Senders im Rhythmus eines für jeden Sender besonderen Ruf-oder Erkennungszeichens um :einige hundert Schwingungen erhöht, d. h. in der Frequenz moduliert wird. Diese doppelte Modulation ist an sich bekannt. Ebenso bekannt ist das Mittel zur Hervorbringung der Frequenzänderung, nämlich ein Kondensator von entsprechend geringer Kapazität, welcher den offenen Schwingungskreis des Senders mittels eines automatischen Schalters parallel schalten wird. Dieser Schalter, von einem kleinen Motor oder Uhrwerk angetrieben, wird so ausgebildet, daß er während einer Umdrehung eine bestimmte Anzahl Kontakte von längerer oder kürzerer Dauer, dem vorerwähnten Rhythmus entsprechend, zwischen dem Zusatzkondensator und Erde vermittelt. Die andere Belegung wird an der Antennenseite des Schwingungskreises fest angeschlossen. Die geringe Änderung der Trägerfrequenz um einige hundert Schwingungen bedingt keine merkliche Lautstärkeänderungen in den auf die Trägerwelle abgestimmten normalen Empfänger.Method for wireless messaging with simultaneous Flodulation of the carrier wave in amplitude and frequency. The invention relates to a System for the specific identification of working radio stations and is based on the fact that, the carrier oscillation of the transmitter in the amplitude modulated by the speech Rhythm of a special call or identification symbol for each transmitter around: some hundred vibrations increased, d. H. is modulated in frequency. This double Modulation is known per se. The means of production is just as well known the frequency change, namely a capacitor with a correspondingly low capacity, which the open oscillation circuit of the transmitter by means of an automatic switch will switch in parallel. This switch, driven by a small motor or clockwork, is designed so that it has a certain number of contacts during one revolution of longer or shorter duration, according to the rhythm mentioned above, between mediated by the additional capacitor and earth. The other assignment is on the antenna side of the oscillation circuit is firmly connected. The small change in the carrier frequency a few hundred oscillations does not cause any noticeable changes in volume in the normal receiver tuned to the carrier wave.
Um einen derart arbeitenden Sender mit einem entfernten Empfänger suchen zu können, wird der Empfangskreis nach vorheriger grober Abstimmungmittels eines,Überlagerersfüreinen kurzen Moment zu Schwingungen erregt und fein nachgestimmt. Während des Durchpfeifens, wird man den gesuchten Sender sofort an dem Rhythmus seines Erkennungszeichens feststellen können. Hierauf wird auf normalen Empfang übergegangen.To such a working transmitter with a remote receiver to be able to search, the receiving circle becomes after rough coordination means beforehand a superimposer excited to vibrations for a brief moment and fine-tuned. During the whistling, you will immediately find the station you are looking for at the rhythm be able to determine its distinguishing mark. Normal reception is then activated passed over.
Der große Vorteil des Verfahrens beruht darauf, daß man einen Sender, auf den abgestimmt werden soll, nicht erst während einer Programmpause an dem bisher üblichen Pausenzeichen oder durch den Ansager als den gesuchten oder falschen erkennt, sondern der Empfänger wird an Hand der neuen Erkennungseinrichtung jederzeit, auch während der Übermittlung der telephonischen Nachricht, sofort richtig eingestellt werden können, was bei der großen Anzahl dicht beieinanderliegender Sendestationen von außerordentlicher Bedeutung ist, da die wenigsten Empfänger mit einem genügend genau arbeitenden Wellenmesser eingerichtet sind. Außerdem werden die bisherigen, manchmal dauernden Rückkopplungsstörungen nicht, wie man vielleicht annehmen dürfte, vermi,hrt, sondern im Gegenteil vermindert; ein Empfang bei schwingender Antenne ist vollständig ausgeschlossen, weil die Darbietungen sofort von dem Erkennungszeichen übertönt werden. Wenn auch die Einrichtung für die reinen Detektorempfänger ohne Abstimmungsüberlagerer nicht in Frage kommt, so ist diese für letztere wegen ihrer geringen Reichweite zu entbehren.The great advantage of the process is based on the fact that you have a transmitter, to be coordinated with, not only during a program break on the previous one recognizes usual pause signs or by the announcer as the wanted or wrong one, but the recipient will be on hand to the new recognition device at any time, too during the transmission of the telephone message, immediately set correctly what with the large number of closely spaced transmitting stations is of extraordinary importance, since few recipients with one enough precisely working wave knife are set up. In addition, the previous, sometimes persistent feedback disturbances not, as one might assume, miss, hear, but on the contrary diminished; a reception with a vibrating antenna is completely excluded because the performances immediately from the distinctive mark be drowned out. Albeit the establishment for that pure detector receiver is out of the question without voting superimposers, this is because of the latter to do without their short range.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET33145D DE478314C (en) | 1927-03-03 | 1927-03-03 | Method for wireless communication with simultaneous modulation of the carrier wave in amplitude and frequency |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET33145D DE478314C (en) | 1927-03-03 | 1927-03-03 | Method for wireless communication with simultaneous modulation of the carrier wave in amplitude and frequency |
Publications (1)
Publication Number | Publication Date |
---|---|
DE478314C true DE478314C (en) | 1929-12-31 |
Family
ID=7557537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET33145D Expired DE478314C (en) | 1927-03-03 | 1927-03-03 | Method for wireless communication with simultaneous modulation of the carrier wave in amplitude and frequency |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE478314C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE759713C (en) * | 1940-07-30 | 1953-06-08 | Lorenz C Ag | Arrangement for secret message transmission by means of a high-frequency carrier wave |
DE931113C (en) * | 1952-01-26 | 1955-08-01 | Fernseh Gmbh | Receiver for double modulated carrier shafts |
DE1000070B (en) * | 1954-09-18 | 1957-01-03 | Pintsch Electro Gmbh | Method for inserting a service channel into the transmission path of a carrier-frequency message path |
DE1015503B (en) * | 1951-08-28 | 1957-09-12 | Gen Electric Co Ltd | Method for the transmission of signals by double modulating a carrier wave in frequency and amplitude |
DE1157510B (en) * | 1957-03-22 | 1963-11-14 | Bbc Brown Boveri & Cie | Multiple transmission method for telemetry purposes |
-
1927
- 1927-03-03 DE DET33145D patent/DE478314C/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE759713C (en) * | 1940-07-30 | 1953-06-08 | Lorenz C Ag | Arrangement for secret message transmission by means of a high-frequency carrier wave |
DE1015503B (en) * | 1951-08-28 | 1957-09-12 | Gen Electric Co Ltd | Method for the transmission of signals by double modulating a carrier wave in frequency and amplitude |
DE931113C (en) * | 1952-01-26 | 1955-08-01 | Fernseh Gmbh | Receiver for double modulated carrier shafts |
DE1000070B (en) * | 1954-09-18 | 1957-01-03 | Pintsch Electro Gmbh | Method for inserting a service channel into the transmission path of a carrier-frequency message path |
DE1157510B (en) * | 1957-03-22 | 1963-11-14 | Bbc Brown Boveri & Cie | Multiple transmission method for telemetry purposes |
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