GB667447A - Improvements in and relating to frequency control systems - Google Patents
Improvements in and relating to frequency control systemsInfo
- Publication number
- GB667447A GB667447A GB11787/50A GB1178750A GB667447A GB 667447 A GB667447 A GB 667447A GB 11787/50 A GB11787/50 A GB 11787/50A GB 1178750 A GB1178750 A GB 1178750A GB 667447 A GB667447 A GB 667447A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- discriminator
- amplifier
- receiver
- tuning
- 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
- 230000010355 oscillation Effects 0.000 abstract 2
- 230000035559 beat frequency Effects 0.000 abstract 1
- 230000011514 reflex Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element
- H03L7/04—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element wherein the frequency-determining element comprises distributed inductance and capacitance
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Transmitters (AREA)
Abstract
667,447. Automatic frequency control systems. BRITISH THOMSON-HOUSTON CO., Ltd. May 11, 1950 [May 21, 1949], No. 11787/50. Class 38 (iv). The local heterodyne oscillator 7 of a pulse radio-echo system has its frequency controlled by three loop circuits A, B, C of which A provides a quick-acting control over a narrow frequency range, C provides a slow-acting control over a wider range, and B varies the tuning frequency of the discriminator 17 in accordance with deviations in the intermediate frequency. The aerial system 3 is connected through a TR switch 4 to the transmitter 1 and receiver 2. The local oscillator 7, shown as a reflex klystron, feeds the mixer in the receiver 2, and also feeds a balanced off-time discriminator 17 of the kind using resonant cavities. The discriminator output is fed through an amplifier 18 and an adjustable bias device 33 to the reflector electrode 10 to adjust the frequency for small deviations. When the deviation is of larger amount, loop C comes into operation, and the control voltage from the amplifier 18 passes the limiter 30 to control an amplifier 31 and motor 32, which adjusts tuning- plugs 11, 12 in the sense to correct the frequency deviation, and also adjusts the bias device 33 in the direction to provide optimum operation of the klystron. By means of loops A and C, the local oscillator thus tends to maintain its frequency at the centre frequency of the discriminator 17. It is, however, desirable that the local oscillator frequency should follow any variations in the transmitted (and received) frequency in order that the I.F. in the receiver should be invariable. This control is effected by mixing the local oscillation with the transmitted oscillation at 20, and feeding the beat frequency through an amplifier 22 to a discriminator 23 tuned to the desired intermediate frequency, the discriminator output being amplified at 24 and passed to a motor 25 for adjusting at 171 the centre tuning of the discriminator 17. Loop A or B now operates to adjust the klystron frequency in accordance with the new setting of the discriminator 17.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US667447XA | 1949-05-21 | 1949-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB667447A true GB667447A (en) | 1952-02-27 |
Family
ID=22071412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11787/50A Expired GB667447A (en) | 1949-05-21 | 1950-05-11 | Improvements in and relating to frequency control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB667447A (en) |
-
1950
- 1950-05-11 GB GB11787/50A patent/GB667447A/en not_active Expired
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