GB625407A - Improvements in or relating to radio transmitters - Google Patents
Improvements in or relating to radio transmittersInfo
- Publication number
- GB625407A GB625407A GB1437438A GB1437438A GB625407A GB 625407 A GB625407 A GB 625407A GB 1437438 A GB1437438 A GB 1437438A GB 1437438 A GB1437438 A GB 1437438A GB 625407 A GB625407 A GB 625407A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- carrier
- pulse
- decay
- amplifiers
- 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
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplitude Modulation (AREA)
- Amplifiers (AREA)
Abstract
625,407. Pulsing carrier frequencies. DODDS, J. M., LUDLOW, J. H., and METROPOLITANVICKERS ELECTRICAL CO., Ltd. May 13, 1938, No. 14374. [Class 40 (v)] In a radio transmitter arranged to transmit rapid changes in carrier level, e.g. for " marks " and " spaces," signal distortion due to exponential growth 2, Fig. 2, and/or decay 3 of the transmitted pulse is reduced by applying additional pulses 4, 5 to increase the rate of growth 8 and/or decay 10 of the signal waveform. This is accomplished as shown in Fig. 3, by two amplifiers 5, 6 connected in anti-phase with the carrier source 1 and grid-controlled by a signal controlling device 9 which receives the original signals on terminals 13. The arrangement is such that on the arrival of the signal front, the impulse 4 is generated in the device 9 by a condenser-resistance switching device, Fig. 4 (not shown), which at the termination of the signal pulse also produces the anti-phase pulse 5. The parallel output connection of the amplifiers 5, 6 ensures that no energy of carrier frequency reaches the final amplifier 12 of the transmitter during " space " periods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1437438A GB625407A (en) | 1938-05-13 | 1938-05-13 | Improvements in or relating to radio transmitters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1437438A GB625407A (en) | 1938-05-13 | 1938-05-13 | Improvements in or relating to radio transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB625407A true GB625407A (en) | 1940-02-07 |
Family
ID=10040046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1437438A Expired GB625407A (en) | 1938-05-13 | 1938-05-13 | Improvements in or relating to radio transmitters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB625407A (en) |
-
1938
- 1938-05-13 GB GB1437438A patent/GB625407A/en not_active Expired
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