GB476915A - Improvements in methods of screening thermionic amplifiers - Google Patents
Improvements in methods of screening thermionic amplifiersInfo
- Publication number
- GB476915A GB476915A GB6905/37A GB690537A GB476915A GB 476915 A GB476915 A GB 476915A GB 6905/37 A GB6905/37 A GB 6905/37A GB 690537 A GB690537 A GB 690537A GB 476915 A GB476915 A GB 476915A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- screen
- conductors
- screens
- sheath
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0064—Earth or grounding circuit
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Communication Cables (AREA)
- Amplifiers (AREA)
- Cable Accessories (AREA)
Abstract
476,915. Preventing inductive disturbance. SIEMENS & HALSKE AKT.- GES. March 9, 1937, Nos. 6905 and 6906. Convention dates, March 9, 1936 and Dec. 14, 1936. [Class 40 (iv)] (Also in Group XL] A thermionic amplifier of the kind having constant gain over a very wide frequency range comprises two screens, of which the inner surrounds the signal path through the amplifier and the outer surrounds the inner, the inner screen being connected by a low-impedance path to one point on the signal path. The invention relates particularly to amplifiers connected with a cable such as shown, in which the inner conductor 1 has an outer concentric return conductor 2 surrounded by a concentric sheath 3. The inner screen 4 of the amplifier is connected to the outer conductors 2 at 5 and to the cathode of the amplifier 7, and may include screening partitions 6 between amplifier stages. The screen 4 is connected also by conductors L1, L2 to the outer screen 10 which is connected at 11 to the sheath 3. Except for these earthing connections L1, L2 (which prevent feedback in the amplifier as explained in Fig. 3 (not shown)), the screens 4 and 10 are carefully insulated. The supply batteries 15 are housed either between the screens 4 and 10 or outside 10 as shown, high-frequency interference being prevented by filters 12, 16, 13, 14. The inner screen 4 may have a copper rail extending through it and connected to the outer conductors 2. The invention may also be applied to transmission systems having symmetrical two-wire lines ; the connection between the inner screen 4 and conductors 2 may then be dispensed with, and only a single connection between inner and outer shields is then required, Fig. 2 (not shown). If the cable comprises several coaxial two-conductor lines, each with its own amplifier, a common outer shield is provided and connected to the cable sheath. Reference has been directed by the Comptroller to Specification 450,280, [Group XL].
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE476915X | 1936-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB476915A true GB476915A (en) | 1937-12-17 |
Family
ID=6542057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6905/37A Expired GB476915A (en) | 1936-03-09 | 1937-03-09 | Improvements in methods of screening thermionic amplifiers |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2170050A (en) |
| FR (1) | FR818963A (en) |
| GB (1) | GB476915A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR962874A (en) * | 1943-04-27 | 1950-06-22 | ||
| US2483189A (en) * | 1944-09-13 | 1949-09-27 | Hartford Nat Bank & Trust Comp | Transmission line oscillator |
| US2537194A (en) * | 1945-11-05 | 1951-01-09 | Edison Inc Thomas A | Phonograph control mechanism |
| GB627933A (en) * | 1947-08-15 | 1949-08-18 | Standard Telephones Cables Ltd | Improvements in or relating to housings for apparatus installed in sub-aqueous cables |
| US2739286A (en) * | 1950-09-01 | 1956-03-20 | Robert W Schede | Alpha survey meter circuit |
| US2881266A (en) * | 1953-06-26 | 1959-04-07 | Bell Telephone Labor Inc | High impedance input circuit amplifier |
| US3196364A (en) * | 1961-05-16 | 1965-07-20 | Honeywell Inc | Shielded differential amplifier |
| US3896425A (en) * | 1973-10-16 | 1975-07-22 | Tyco Laboratories Inc | Proximity detector |
| JP2003101431A (en) * | 2001-09-26 | 2003-04-04 | Hitachi Kokusai Electric Inc | Wireless receiver |
-
1937
- 1937-03-09 FR FR818963D patent/FR818963A/en not_active Expired
- 1937-03-09 US US129823A patent/US2170050A/en not_active Expired - Lifetime
- 1937-03-09 GB GB6905/37A patent/GB476915A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2170050A (en) | 1939-08-22 |
| FR818963A (en) | 1937-10-07 |
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