GB782071A - Improvements in or relating to radio receivers - Google Patents
Improvements in or relating to radio receiversInfo
- Publication number
- GB782071A GB782071A GB1116653A GB1116653A GB782071A GB 782071 A GB782071 A GB 782071A GB 1116653 A GB1116653 A GB 1116653A GB 1116653 A GB1116653 A GB 1116653A GB 782071 A GB782071 A GB 782071A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- aerial
- condenser
- signals
- medium
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
782,071. Aerial coupling arrangements. ELECTRIC & MUSICAL INDUSTRIES, Ltd. April 23, 1954 [April 23, 1953], No. 11166/53. Class 40 (7). An aerial coupling arrangement for feeding selectively signals in two different wavebands to a receiver comprises a coupling impedance arranged so as to couple the aerial to each of two input circuits designed for operation one in each of the two wavebands. In one embodiment the coupling impedance consists of the primary winding 4 of an input transformer in series with a condenser 5. The aerial end of the impedance is coupled through a built-in medium wave loop aerial 1 to the medium wave contact 6 of the selector switch 11. Medium waves signals are developed largely across condenser 5. For short wave signals condensei 5 presents a very low impedance and signal transfer is between the primary and secondary of transformer 4, 8 and thus to the short-wave contact 7 of the switch 11. Trimming condensers 9 and 10 and a tuning condenser 12 common to both inputs complete the circuit. In the embodiment the inductance of the winding 4 presents a negligible impedance. However, in a modification (Fig. 2, not shown) the condenser 5 may be dispensed with and the primary winding designed to have a sufficiently high impedance for medium waveband signals to be generated across it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1116653A GB782071A (en) | 1953-04-23 | 1953-04-23 | Improvements in or relating to radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1116653A GB782071A (en) | 1953-04-23 | 1953-04-23 | Improvements in or relating to radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB782071A true GB782071A (en) | 1957-08-28 |
Family
ID=9981228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1116653A Expired GB782071A (en) | 1953-04-23 | 1953-04-23 | Improvements in or relating to radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB782071A (en) |
-
1953
- 1953-04-23 GB GB1116653A patent/GB782071A/en not_active Expired
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