US1788073A - Automatic frequency controller - Google Patents

Automatic frequency controller Download PDF

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Publication number
US1788073A
US1788073A US280730A US28073028A US1788073A US 1788073 A US1788073 A US 1788073A US 280730 A US280730 A US 280730A US 28073028 A US28073028 A US 28073028A US 1788073 A US1788073 A US 1788073A
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US
United States
Prior art keywords
fork
frequency
energy
transformer
station
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 - Lifetime
Application number
US280730A
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English (en)
Inventor
Gester J Wolf
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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.)
Filing date
Publication date
Priority to BE360937D priority Critical patent/BE360937A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US280730A priority patent/US1788073A/en
Application granted granted Critical
Publication of US1788073A publication Critical patent/US1788073A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Definitions

  • This invention relates to relaying systems for radio communication and particularly to systems in which two radio transmitting stations at a distance apart are to be maintained 5 at exactly the same wave length;
  • a tunmg fork at thehome station impresses a modulation upon the energy tionlproduces
  • the fork at the home station is impressed upon a local the influence of its regenera when, because of fading or' oeasesto control the fork at the distant sta tion, the two forks will become outof phase.- If, after such an event, the interruption ends and the fork at the home station can again produce an influence at the distant station,
  • the incorrect phase relation may cause this influence to tend to stop the fork at the distant station, which would result in an interruption of broadcasting from-the distant station.
  • the sending set 1 is ,at the home'station. It is intended tosend out either a frequency produced by. a tuning fork at the sending station or 'a' high fre-' quency modulated y the frequency of the fork.
  • the antenna 2 at the receiving stathe circuits and apparatus tion' is connected to a receiving set 3 which is tuned to the signals sent but by sending" set paratus at the distant station. Adjustment of the receiving set must, therefore, be controlled over a line l, and the key 5 is for such control.
  • a filter 6 is provided between line 4 and the con trally located apparatus at the distant station. This filter is of the type which Will deliver only currents of tration, this connection to the relay is shown as associated with, the input circuit of the frequency multiplier but it may equally well be included in the connection to the grid of any of the tubes in said multiplier.
  • the contacts of the relay 38 control a shunt 39 which preferably includes a resistor 40, the shunt extending across the grid-filament connection of any one of the device including tubes 16 and 17 arranged in cascade. r
  • the fork 10 a frequency determined by the fork at. the tubes between the transformer 30 and the sending station. '---magnet-23,-Bir ferab ly, however, one of the At the distant station the fork 10 is tuned, tubes in the amplifier, between the fransas closely as can conveniently be done, to former 30 and the transformer 33, is chosen.
  • the receiv- Details of the provisions for maintaining ing set 3 delivers to the line 4 currents of. a this fork at constant temperature and thus frequency determined by. the fork in the insuring its constant frequency are described sending set 1.
  • this frequency is in the above-mentioned co-pending applicavery close to'the frequency of the fork 10. tion.
  • Any suitable means for adjusting the re- A regenerative system of circuits is proceiving set 3 may be controlled over the line vided whereby the fork may be maintained 4 by means of the key 5, and the receiving in vibration even when no energy is received set may thus be adjusted to best conditions from the receiving set 3.
  • These regenerafor delivering impulses of the fork fi'etive circuits include a coil 11 mounted upon quency to the filter 6. Impulses of a freone tine of the fork. Electromotive forces, quency very different from this will fail to developed in this coil by the vibration of the traverse the filter 6.
  • the transformer 30, fork establish currents through the resistor therefore, will deliver to the tube 31 im- 12 and so impress a potential upon the grid ul f o l th f k frequenc of a tube 13.
  • the potentials amplified by Such impulses, amplified by t e cascade this tube are delivered, through a condenser amplifier including tubes 31 to 17 inclusive, 14 and a transformer 15, to an amplifying cause the magnet 23 to impress a periodic force upon the fork 10. Since this periodic
  • the output of this amplifier is delivered, as the natural ffequency of the fork, the fork through a filter, including condensers 18 will have forced vibrations of the frequency and 19 in series and an inductor 20 in parof the impulses received over the line 4:.
  • allel to a magnet 23-whi'ch drives the fork Only a small part of the energy needed to 10.
  • the inductor 20 is made adjustable in maintain the fork in vibration comes over order to assist in controlling the frequency thedin 4, The vibration of the fork, by of the fork 10.
  • a still closer control over d Y i ti f i th i da d que y is rded y t e u e 24 ing 11, deliversen ergy, rough the tube 1.3 which is controlled by the grid-biasing deand condenser 14, to th input, circuit vice 25., tube 16.
  • the tubes 16 and 17, with their force is of very nearly the samehfrequency
  • the energy delivered to the transformer associated circuits, and the tube 13, with 15 through the tube 13 is pp n y its associated'circuits, constitute a regeneraenergy from the tra s or r 30 w (3011'- tive system of circuits which cooperates with neots the filter (H0 a c cade a ph y g sy the fork 10 to maintain it in vibration.
  • tem including tubes 31 d 3 and The regenerative action of this system is former 33.
  • the potential across reslstor 12 1S de indefinitely or, at least for a period of several cred t0 the Input clrcillt Of a q e y m seconds after impulses cease to arrive over tiplier 35.
  • the frequen y multipli r may the line 4.
  • the fork 10 and the tubes 13 to be of any preferred form but, for my pur- 17, with their associated circuits, may thus poses, I have found the o m t at in be regarded as a local source of oscillation Fig. 3 of the above-mentioned co-pending of nearly the same frequency as the impulses application to be convenient.
  • the multiarriving over the line 4; plier may include a number of vacuumtubes.
  • the electromotive force delivered by the The input circuit of such a frequency mulcoil 11 not only acts upon the tube 13 but also tiplier is connected to the grid and filaacts upon the frequncy multiplier 35.
  • a condenser 36 is inserted, and ing in the production of higher frequencies leads 37 from the two sides of the condenser in the frequency multiplier shall not be lost, extend to the winding38 of a relay biased as condenser 36 bridges an openin in the' to closed position.
  • the shunt 39 is, therefore, open and without effect upon the tube 31.
  • the circuit through the winding 38 extends from the upper end of the resistor 12 through the leads 37 and said winding to the grid of the first tube of the frequency multi her and from the filament of said tube to t e lower end of the resistor 12.
  • the rectifying action of the filament and grid in said' first tube gives a unidirectional character to the force exertedby the winding 38 upon the contacts of the relay.
  • the bias of the relay to closed position may, therefore, properly be a magnetic bias such as polarized relays ordinarily possess.
  • the magnitude of this bias is so chosen that, normally, the current in winding 38 is just suflicient to hold the relaycontacts open.
  • the nornfal condition is that in which the output from the -local source comprising thev 'fork and its associated regenerative system of circuits is neither increased'nor diminished by energy from the transformer 33.
  • the natural frequency of the local oscillating device- is. not-the same as that of the currents over the line 4. Consequently, when these currents cease, aslowly varying phase 4 difierence'will arise between the ork at the sending station 1 and the fork 10.
  • the energy'de ivered to the transformer 15 may actually be less when the interruption is over than it was during said interruption. This will result in a diminution in the amplitude of the vibration of the fork -10.
  • the diminution in amplitude of the fork may be very rapid. Even of the diminution isnot rapid, it will unless prevented, continue until the fork has been brought to rest or nearly to rest. Then, until the fork has had time enough to again buildv u oscillations in phase with those at the stationl, little or no energy will be delivered to the frequency multiplier 35 and little or no energy will be broadcasted cally, but vectorially in'the transformer 15.
  • the resistor 40 must have somewhat less resistance than for the adjustment used in the operation first described.
  • a local oscillation device having a natural frequency
  • Means for controlling the frequency of an oscillating system from a distance comprising regenerative connections forming part of said system, a frequency-selective receiving device adjusted to be responsive to arriving signals of a frequency approximately that of the natural period of the oscillation system, means for delivering inipulses from said receiving set to said regenerat'ive connections and automatic means for diminishing the effect of Sn cl impulses upon said oscillating system whenever the sense of the impulses is opposed to that of the oscillations.
  • a device having a natural period of mechanical vibration, a regenerative system associated therewith to maintain said device in vibra'-, tion, means controlled from a distance for impressing on said regenerath'e system oscillatory energy of a period nearly equal to said natural period, whereby forced oscillations are maintained in said regenerative sys tem ip synchronism with said oscillatory energy, means for diverting :aid oscillatory energy and means controlled by the resultant current in said regenerative-system for controlling said diverting means.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Particle Accelerators (AREA)
US280730A 1928-05-26 1928-05-26 Automatic frequency controller Expired - Lifetime US1788073A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE360937D BE360937A (enrdf_load_stackoverflow) 1928-05-26
US280730A US1788073A (en) 1928-05-26 1928-05-26 Automatic frequency controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US280730A US1788073A (en) 1928-05-26 1928-05-26 Automatic frequency controller

Publications (1)

Publication Number Publication Date
US1788073A true US1788073A (en) 1931-01-06

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US280730A Expired - Lifetime US1788073A (en) 1928-05-26 1928-05-26 Automatic frequency controller

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US (1) US1788073A (enrdf_load_stackoverflow)
BE (1) BE360937A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671897A (en) * 1945-07-03 1954-03-09 Roger B Woodbury Automatically synchronized long range navigation pulse transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2671897A (en) * 1945-07-03 1954-03-09 Roger B Woodbury Automatically synchronized long range navigation pulse transmitter

Also Published As

Publication number Publication date
BE360937A (enrdf_load_stackoverflow)

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