GB674635A - Improvements in or relating to radio receivers - Google Patents
Improvements in or relating to radio receiversInfo
- Publication number
- GB674635A GB674635A GB1785649A GB1785649A GB674635A GB 674635 A GB674635 A GB 674635A GB 1785649 A GB1785649 A GB 1785649A GB 1785649 A GB1785649 A GB 1785649A GB 674635 A GB674635 A GB 674635A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformer
- primary
- selectivity
- signals
- formers
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
- H03H7/0169—Intermediate frequency filters
- H03H7/0176—Intermediate frequency filters witout magnetic core
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Amplifiers (AREA)
Abstract
674,635. Selectivity control. KOLSTER BRANDES, Ltd. June 30, 1950 [July 6, 1949], No. 17856/49. Class 40 (v). In the intermediate frequency stage of a receiver adapted to receive A.M. or F.M. signals, a pair of transformers tuned to the appropriate A.M. and F.M. I.F. frequencies are arranged so that the primary of the F.M. transformer can be switched in series with the secondary of the A.M. transformer to vary the selectivity of the latter. With the ganged switches in position 1, the amplifier will pass F.M. signals through the transformer comprising primary 23 and secondary 24 or A.M. signals through the transformer comprising primary 25 and secondary 26. Upon the switches being moved to position 2 the inductor of the F.M. primary 23 is connected in series with the inductor of secondary 26 to increase the coupling in the A.M. transformer and thus decrease the selectivity. Any detuning may be overcome by a variable capacitor. The transformers preferably consist of coils on a former with adjustable magnetic cores for tuning, Fig. 1 (not shown). The coils may be adjustable on the formers and the formers may be moved relative to one another to vary the selectivity further.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1785649A GB674635A (en) | 1949-07-06 | 1949-07-06 | Improvements in or relating to radio receivers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1785649A GB674635A (en) | 1949-07-06 | 1949-07-06 | Improvements in or relating to radio receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB674635A true GB674635A (en) | 1952-06-25 |
Family
ID=10102413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1785649A Expired GB674635A (en) | 1949-07-06 | 1949-07-06 | Improvements in or relating to radio receivers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB674635A (en) |
-
1949
- 1949-07-06 GB GB1785649A patent/GB674635A/en not_active Expired
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