GB670302A - Improvements in or relating to two-way radio communication stations - Google Patents
Improvements in or relating to two-way radio communication stationsInfo
- Publication number
- GB670302A GB670302A GB1789748A GB1789748A GB670302A GB 670302 A GB670302 A GB 670302A GB 1789748 A GB1789748 A GB 1789748A GB 1789748 A GB1789748 A GB 1789748A GB 670302 A GB670302 A GB 670302A
- Authority
- GB
- United Kingdom
- Prior art keywords
- receiver
- oscillator
- transmitter
- circuit
- amplifier
- 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
- 238000012544 monitoring process Methods 0.000 abstract 3
- 239000013078 crystal Substances 0.000 abstract 2
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000006467 substitution reaction Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/34—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being vacuum tube
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
670,302. Monitoring transmitters; valve generating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 28, 1950 [July 6, 1949], No. 17897/49. Classes 40 (v) and 40 (vi). The terminal station of a two-way radio communication system comprises a transmitter operating on one frequency and a superheterodyne receiver operating on another, and the receiver is provided with an additional local oscillator circuit which may be substituted for its normal local oscillator whereby the receiver is tuned to the operating frequency of the transmitter at the terminal station for monitoring the performance of the transmitter or receiver or both. As shown in Fig. 1 the receiver comprises R.F. amplifier 5, frequency changing stage 6, I.F. amplifier 7, and a demodulator or discriminator 8, local oscillations being provided by a harmonic amplifier 10 driven by a crystalcontrolled oscillator 11a or 11b selected by a switch 14. Alternatively, interchangeable plugin crystals may be used. With the oscillator 11a in circuit the receiver is tuned to the distant transmitter, substitution of the oscillator 11b tuning the receiver to the local transmitter for monitoring. Fig. 2 shows a suitable local oscillator circuit which includes two frequency determining circuits 12 and 13 each comprising a crystal in series with a parallel-tuned circuit, one or other circuit being selected by ganged switches 14a, 14b, and the output of the oscillator applied to the harmonic amplifier 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1789748A GB670302A (en) | 1949-07-06 | 1949-07-06 | Improvements in or relating to two-way radio communication stations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1789748A GB670302A (en) | 1949-07-06 | 1949-07-06 | Improvements in or relating to two-way radio communication stations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB670302A true GB670302A (en) | 1952-04-16 |
Family
ID=10103161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1789748A Expired GB670302A (en) | 1949-07-06 | 1949-07-06 | Improvements in or relating to two-way radio communication stations |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB670302A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3177430A (en) * | 1961-11-29 | 1965-04-06 | Gen Electric | Test arrangement for communication systems |
-
1949
- 1949-07-06 GB GB1789748A patent/GB670302A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3177430A (en) * | 1961-11-29 | 1965-04-06 | Gen Electric | Test arrangement for communication systems |
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