GB500045A - Improvements in or relating to modulating arrangements suitable for use in carrier current signalling systems - Google Patents
Improvements in or relating to modulating arrangements suitable for use in carrier current signalling systemsInfo
- Publication number
- GB500045A GB500045A GB2120837A GB2120837A GB500045A GB 500045 A GB500045 A GB 500045A GB 2120837 A GB2120837 A GB 2120837A GB 2120837 A GB2120837 A GB 2120837A GB 500045 A GB500045 A GB 500045A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- modulating
- anode
- carrier
- source
- 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
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
- H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
- H03C1/20—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to anode
Landscapes
- Selective Calling Equipment (AREA)
Abstract
500,045. Valve modulating circuits. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and TERRONI, T. B. D. July 30, 1937, No. 21208. [Class 40 (v)] The modulating voltage is injected into the anode-cathode circuit of a wave generating or amplifying valve both on the anode and cathode sides of the high-tension source. As shown the modulating-valve PV is a pentode and two of its grids are back-coupled by the circuit LC to produce the carrier wave. Between the anode and the positive side of the H.T. source are connected a resistance R1 and the secondary coil of a transformer T3, and a further resistance, R2 and transformer T2 are connected between the cathode and the negative HT terminal. The primary coils of transformers T2, T3 are in series in the plate circuit of a valve TV, the grid of which is fed from the source of modulation M. The outer ends of resistances R1, R2 are connected by a carrier byepass condenser C3, whilst their inner ends are connected by condensers C1, C2 to the output terminals, which may be used to feed a push-pull amplifier for the modulated wave. The pentode may be replaced by a screen-grid valve, and the carrier may be generated by a separate valve and fed to a control grid of the modulating-valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2120837A GB500045A (en) | 1937-07-30 | 1937-07-30 | Improvements in or relating to modulating arrangements suitable for use in carrier current signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2120837A GB500045A (en) | 1937-07-30 | 1937-07-30 | Improvements in or relating to modulating arrangements suitable for use in carrier current signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB500045A true GB500045A (en) | 1939-01-30 |
Family
ID=10158995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2120837A Expired GB500045A (en) | 1937-07-30 | 1937-07-30 | Improvements in or relating to modulating arrangements suitable for use in carrier current signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB500045A (en) |
-
1937
- 1937-07-30 GB GB2120837A patent/GB500045A/en not_active Expired
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