GB160251A – Improvements in or connected with radio-navigational apparatus and the like
– Google Patents
GB160251A – Improvements in or connected with radio-navigational apparatus and the like
– Google Patents
Improvements in or connected with radio-navigational apparatus and the like
Info
Publication number
GB160251A
GB160251A
GB3134619A
GB3134619A
GB160251A
GB 160251 A
GB160251 A
GB 160251A
GB 3134619 A
GB3134619 A
GB 3134619A
GB 3134619 A
GB3134619 A
GB 3134619A
GB 160251 A
GB160251 A
GB 160251A
Authority
GB
United Kingdom
Prior art keywords
circuit
frequency
wave
heterodyne
tuned
Prior art date
1919-12-15
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
Application number
GB3134619A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JAMES ERSKINE MURRAY
Original Assignee
JAMES ERSKINE MURRAY
Priority date (The priority date 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 date listed.)
1919-12-15
Filing date
1919-12-15
Publication date
1921-03-15
1919-12-15
Application filed by JAMES ERSKINE MURRAY
filed
Critical
JAMES ERSKINE MURRAY
1919-12-15
Priority to GB3134619A
priority
Critical
patent/GB160251A/en
1921-03-15
Publication of GB160251A
publication
Critical
patent/GB160251A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G01—MEASURING; TESTING
G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
Abstract
160,251. Murray, J. Erskine-, Robinson, J., and Crowther, H. L. Dec. 15, 1919. Bearings, determining; heterodyne receiving systems.-In a direction-finding system of the typo in which the frequency of the transmitted wave is a function of the direction of transmission, the receiving station is provided (1) with a tuned circuit to give a heterodyne effect of high or inaudible frequency to the continuous signalling wave, and (2) with another tuned circuit on which the heterodyne effect is impressed to give a superimposed heterodyne effect of low or audible frequency. The transmitting station comprises a directive transmitter adapted to emit successively along bearings between North and South continuous waves having a different frequency for each direction of propagation. Preferably the transmitter is adapted to transmit during 180‹ of rotation only. As the frequency for each direction of propagation is known at the receiving station, by listening for the minimum transmission of the signalling wave, that is, for the wave propagated in line with the receiving station but in the opposite direction, and recording its wavelength, the bearing of a line joining the transmitting and receiving stations can be found. The receiving station comprises two tuned circuits 4, 5, and 8, 9, 10 adapted to self-oscillate, as shown in Fig. 1, or having oscillations induced therein from an independent source. The circuit 4, 5, 6 is tunable between the range of the transmitting wave, for example 1000 to 2000 metres, whilst the circuit 8, 9, 10 is tunable to a low frequency, for example 20000 to 40000. When the circuit 4, 5, 6 is tuned to the wave-length corresponding to the direction of minimum transmission, two equal heterodyne ” swells ” will be produced as the signalling wave rotates about the transmitting station, but if the circuit 4, 5, 6 is not tuned to the correct wave-length two heterodyne “swells” of unequal intensities are produced. As the limit of audibility is restricted, ordinary heterodyne between the signalling wave and the circuit 4, 5, 6 could only be compared over a very small angle on either side of the minimum, where signals may be very weak. For this reason, heterodyne effects in the circuit 4, 5, 6 are superimposed on the circuit 8, 9, 10 to obtain beats of audible frequency. An audible beat frequency will thus not be produced in the circuit 8, 9, 10 until the frequency of the signalling wave has varied sufficiently to produce beats in the circuit 4, 5, 6, which are of the order of the frequency of the oscillations in the circuit 8, 9, 10. The angle at which signals are heard may therefore be widened by increasing the frequency of the circuit 8, 9, 10. Specification 149,827 is referred to.
GB3134619A
1919-12-15
1919-12-15
Improvements in or connected with radio-navigational apparatus and the like
Expired
GB160251A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB3134619A
GB160251A
(en)
1919-12-15
1919-12-15
Improvements in or connected with radio-navigational apparatus and the like
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB3134619A
GB160251A
(en)
1919-12-15
1919-12-15
Improvements in or connected with radio-navigational apparatus and the like
Publications (1)
Publication Number
Publication Date
GB160251A
true
GB160251A
(en)
1921-03-15
Family
ID=10321742
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3134619A
Expired
GB160251A
(en)
1919-12-15
1919-12-15
Improvements in or connected with radio-navigational apparatus and the like
Country Status (1)
Country
Link
GB
(1)
GB160251A
(en)
1919
1919-12-15
GB
GB3134619A
patent/GB160251A/en
not_active
Expired
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