GB458149A - Method of eliminating the radiation of heterodyne receivers, more particularly those for short waves - Google Patents
Method of eliminating the radiation of heterodyne receivers, more particularly those for short wavesInfo
- Publication number
- GB458149A GB458149A GB9876/36A GB987636A GB458149A GB 458149 A GB458149 A GB 458149A GB 9876/36 A GB9876/36 A GB 9876/36A GB 987636 A GB987636 A GB 987636A GB 458149 A GB458149 A GB 458149A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- condenser
- frequency changer
- radiation
- april
- 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
- 230000005855 radiation Effects 0.000 title abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
- H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
- H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
458,149. Valve circuits for wireless reception. RADIOAKT. - GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. April 3, 1936, No. 9876. Convention date, April 6, 1935. Addition to 458,147. [Class 40 (v)] In a superheterodyne receiver using a mixing hexode radiation of the local oscillation due to coupling to the control grid to which the signals are applied is compensated by a balancing circuit as described in the parent Specification and an exact phase shift of 180 is obtained in the local oscillator circuit by dividing the tuning condenser into two parts 5<1>, 5<11> and feeding the anode and cathode through series impedances and connecting the mid-point of the series condensers to the cathode. Fig. 3 shows a circuit in which an earthed screen surrounds the frequency changer. Fig. 4 shows the separate oscillator enclosed with the tuned circuit by a screen 21 from which the condensers 5<1>, 5<11> are widely spaced and operated by an insulated spindle. The balancing condenser 19 is provided with an earthed intermediate adjusting plate and the frequency changer 1 is separately screened. The aerial is coupled through condenser 28 or a winding 30 to a choke 29 in the grid circuit of the frequency changer 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE458147X | 1935-03-12 | ||
| DE2147556X | 1935-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB458149A true GB458149A (en) | 1936-12-14 |
Family
ID=32043851
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7018/36A Expired GB458147A (en) | 1935-03-12 | 1936-03-09 | Elimination of radiation in the case of superhet receivers |
| GB9876/36A Expired GB458149A (en) | 1935-03-12 | 1936-04-03 | Method of eliminating the radiation of heterodyne receivers, more particularly those for short waves |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7018/36A Expired GB458147A (en) | 1935-03-12 | 1936-03-09 | Elimination of radiation in the case of superhet receivers |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US2131194A (en) |
| BE (2) | BE414283A (en) |
| FR (2) | FR803289A (en) |
| GB (2) | GB458147A (en) |
| NL (1) | NL46582C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH343469A (en) * | 1955-08-19 | 1959-12-31 | Hazeltine Corp | Circuit for preventing an oscillation of a predetermined frequency from being transferred from the output circuit of an amplifier to its input circuit |
| NL127041C (en) * | 1959-08-08 |
-
0
- BE BE414854D patent/BE414854A/xx unknown
-
1936
- 1936-03-05 US US67343A patent/US2131194A/en not_active Expired - Lifetime
- 1936-03-09 GB GB7018/36A patent/GB458147A/en not_active Expired
- 1936-03-10 BE BE414283D patent/BE414283A/xx unknown
- 1936-03-11 FR FR803289D patent/FR803289A/en not_active Expired
- 1936-04-02 US US72314A patent/US2147556A/en not_active Expired - Lifetime
- 1936-04-03 GB GB9876/36A patent/GB458149A/en not_active Expired
- 1936-04-03 NL NL77273A patent/NL46582C/xx active
- 1936-04-04 FR FR47248D patent/FR47248E/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL46582C (en) | 1939-09-15 |
| FR47248E (en) | 1937-02-20 |
| BE414283A (en) | 1936-04-30 |
| US2131194A (en) | 1938-09-27 |
| GB458147A (en) | 1936-12-14 |
| FR803289A (en) | 1936-09-26 |
| BE414854A (en) | |
| US2147556A (en) | 1939-02-14 |
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