DE854225C - Method and device for center adjustment when receiving frequency shift keyed telegraph transmitters - Google Patents
Method and device for center adjustment when receiving frequency shift keyed telegraph transmittersInfo
- Publication number
- DE854225C DE854225C DEL904A DEL0000904A DE854225C DE 854225 C DE854225 C DE 854225C DE L904 A DEL904 A DE L904A DE L0000904 A DEL0000904 A DE L0000904A DE 854225 C DE854225 C DE 854225C
- Authority
- DE
- Germany
- Prior art keywords
- frequency
- tube
- screen
- deflection system
- frequency shift
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/16—Frequency regulation arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/20—Cathode-ray oscilloscopes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/06—Measuring depth of modulation
Description
Die Erfindung bezieht sich auf ein Verfahren und auf eine Vorrichtung zur Auffindung und Einstellung der Symmetrie der beiden abwechselnd getasteten Signalfrequenzen zu einer gedachten Mittenfrequenz beim Empfang eines nach dem Frequenzumtastverfahren betriebenen Telegrafiekanals. The invention relates to a method and an apparatus to find and adjust the symmetry of the two alternately keyed signal frequencies to an imaginary center frequency when receiving a frequency shift keying operated telegraphic channel.
In Telegrafiekanäle, die nach dem Frequenzumtastverfahren betrieben werden, laufen nur die beiden abwechselnd gesendeten Frequenzen der Signale, die um den Signalhub voneinander entfernt sind. Die mittlere Frequenz zwischen den beiden Signalfrequenzen, die Nennfrequenz des Senders, wird nicht ausgesendet, läuft also nicht im Kanal. Trotzdem ist es zur Vermeidung von Zeichenverzerrungen notwendig, die Nennfrequenz des Senders in der Hubmitte zu halten. In telegraphic channels operated according to the frequency shift keying process only run the two alternating frequencies of the signals that are separated from each other by the signal deviation. The middle frequency between the two Signal frequencies, the nominal frequency of the transmitter, is not transmitted, so it runs not in the canal. Nevertheless, in order to avoid character distortion, it is necessary to keep the nominal frequency of the transmitter in the middle of the stroke.
Die bisher bekannten Vorrichtungen zur Mitteneinstellung genügten nicht allen Anforderungen, insbesondere dann nicht, wenn der Hub des frequenzumgetasteten Senders einstellbar ist. Man hat zu diesem Zweck z. B. schon Instrumentenanzeiger verwendet, bei denen man aber nicht erkennen kann, nach welcher Seite eine etwaige Mittenabweichung stattgefunden hat. Andere bekannte Vorrichtungen ließen zwar die Richtung der Abweichung erkennen, erforderten jedoch eine Feststellung der Größe des Hubes vor Verkehrseröffnung. The previously known devices for center adjustment were sufficient not all of the requirements, especially not when the stroke of the frequency-shifted Transmitter is adjustable. One has for this purpose z. B. already instrument display are used, but you cannot tell which side any Center deviation has taken place. Other known devices let the Detecting the direction of the deviation, however, required determining the size of the hub before the opening of traffic.
Das Verfahren der Erfindung vermeidet nun alle diese Nachteile der bekannten Verfahren dadurch, daß die aus den umgetasteten Signalfrequenzen erzeugten Gleichstromimpulse einem, z. B. dem waagerecht ablenkenden, Ablenksystem einer Oszillographenröhre aufgegeben werden. Es erscheinen dann auf dem Schirm der Oszillographenröhre zwei Strahlaufsatzmarken. The method of the invention now avoids all of these disadvantages known method in that the generated from the keyed signal frequencies DC pulses a, z. B. the horizontally deflecting, deflection system of an oscilloscope tube to be abandoned. Two will then appear on the screen of the oscilloscope tube Jet attachment marks.
Die Fig. I der Zeichnung zeigt den Schirm einer zu diesem Zweck benutzten Oszillographenröhre mit den beiden Strahlaufsatzpunkten I und 2. Fig. I of the drawing shows the screen of a used for this purpose Oscillograph tube with the two beam attachment points I and 2.
Es ist dabei von Vorteil, wenn man durch Aufgabe einer Frequenz auf ein Ablenksystem der Oszillographenröhre, das den Strahl senkrecht zu der Ablenkrichtung des erstgenannten Systems ablenkt, die ursprünglich als Punkte erscheinenden Strahlaufsatzmarken zu Strichen auseinanderzieht. Die zu diesem Zweck benutzte Frequenz kann auf beliebige Weise erzeugt werden, ihre Größe ist unkritisch; sie kann z. B. zwischen Io und Ioo kHz liegen. It is an advantage here if you can give up on a frequency an oscilloscope tube deflection system that places the beam perpendicular to the direction of deflection of the first-mentioned system deflects the jet top marks originally appearing as points pulls apart into lines. The frequency used for this purpose can be set to any Manner, their size is not critical; she can z. B. between Io and Ioo kHz lie.
Die Fig. 2 zeigt den Schirm einer Oszillographenröhre, bei der die Strahlaufsatzmarken der Fig. I zu Strichen 3, 4 auseinandergezogen sind. Die auf dem Schirm angebrachte waagerechte Linie 5 hat dabei eine Einteilung, die eine Messung der Hubhöhe und ein leichtes Erkennen der Mitte (Nennfrequenz) 6 zuläßt. Fig. 2 shows the screen of an oscilloscope tube in which the Jet attachment marks of Fig. I are pulled apart to lines 3, 4. The on The horizontal line 5 attached to the screen is divided into one measurement the lifting height and easy identification of the center (nominal frequency) 6.
Bei höheren Tastgeschwindigkeiten macht der Strahlaufsatzpunkt auf der Oszillographenröhre dabei den Eindruck einer Wasserwaagenblase (Fig. 3), so daß auch eine uneingearbeitete Bedienungsperson die Vorrichtung der Erfindung leicht begreifen und bedienen kann. Bei nicht ausreichenden Tastgeschwindigkeiten kann dieser Effekt auch durch Verwendung einer lang nachleuchtenden Substanz für den Schirm der Oszillographenröhre erreicht werden. The beam contact point opens at higher scanning speeds the oscilloscope tube gives the impression of a bubble level (Fig. 3), see above that even an unskilled operator can easily use the device of the invention understand and operate. If the scanning speed is not sufficient, this effect also by using a photoluminescent substance for the Screen of the oscilloscope tube can be reached.
Die Vorrichtung der Erfindung zeigt jederzeit den Hub an, so daß es auch möglich ist, in längeren Gebepausen bei laufendem Sender stets den eingestellten Hub bzw. die Sendernennfrequenz zu halten. Dieser ist dann durch eine einseitige Markierung (Fig. 4) auf dem Schirm kenntlich. The device of the invention shows the stroke at all times, so that it is also possible to always use the set one during longer breaks with the transmitter running Hub or the nominal frequency of the transmitter. This is then unilateral Marking (Fig. 4) recognizable on the screen.
Die Figur 5 zeigt beispielsweise schematisch eine Schaltungsanordnung für die erfindungsgemäß verwendete Oszillographenröhre. An die Klemmen 7, 8 wird der Ausgang des Empfängers gelegt, während der Generator g eine Frequenz zwischen IO und IOO kHz liefert. FIG. 5 shows, for example, a schematic diagram of a circuit arrangement for the oscilloscope tube used in the present invention. The terminals 7, 8 are connected the output of the receiver placed while the generator g a frequency between Supplies IO and IOO kHz.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL904A DE854225C (en) | 1950-01-14 | 1950-01-14 | Method and device for center adjustment when receiving frequency shift keyed telegraph transmitters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL904A DE854225C (en) | 1950-01-14 | 1950-01-14 | Method and device for center adjustment when receiving frequency shift keyed telegraph transmitters |
Publications (1)
Publication Number | Publication Date |
---|---|
DE854225C true DE854225C (en) | 1952-10-30 |
Family
ID=7255135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL904A Expired DE854225C (en) | 1950-01-14 | 1950-01-14 | Method and device for center adjustment when receiving frequency shift keyed telegraph transmitters |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE854225C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1018904B (en) * | 1956-05-12 | 1957-11-07 | Arnstadt Fernmeldewerk | Method and circuit arrangement for measuring the reference distortion of telegraphic step sequences |
DE1051339B (en) * | 1956-12-17 | 1959-02-26 | Siemens Ag | Circuit arrangement for generating a frequency adjustment voltage for the oscillator of a receiving system for frequency-shift keyed signals |
DE1076199B (en) * | 1958-08-08 | 1960-02-25 | Siemens Ag | Arrangement for the voting display |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2481354A (en) * | 1948-03-11 | 1949-09-06 | Teletype Corp | Bias indicator |
US2480878A (en) * | 1943-12-20 | 1949-09-06 | Bell Telephone Labor Inc | Telegraph signal distortion measuring apparatus and system |
-
1950
- 1950-01-14 DE DEL904A patent/DE854225C/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2480878A (en) * | 1943-12-20 | 1949-09-06 | Bell Telephone Labor Inc | Telegraph signal distortion measuring apparatus and system |
US2481354A (en) * | 1948-03-11 | 1949-09-06 | Teletype Corp | Bias indicator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1018904B (en) * | 1956-05-12 | 1957-11-07 | Arnstadt Fernmeldewerk | Method and circuit arrangement for measuring the reference distortion of telegraphic step sequences |
DE1051339B (en) * | 1956-12-17 | 1959-02-26 | Siemens Ag | Circuit arrangement for generating a frequency adjustment voltage for the oscillator of a receiving system for frequency-shift keyed signals |
DE1076199B (en) * | 1958-08-08 | 1960-02-25 | Siemens Ag | Arrangement for the voting display |
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