GB460221A - Improvements in or relating to radio receivers - Google Patents
Improvements in or relating to radio receiversInfo
- Publication number
- GB460221A GB460221A GB2093035A GB2093035A GB460221A GB 460221 A GB460221 A GB 460221A GB 2093035 A GB2093035 A GB 2093035A GB 2093035 A GB2093035 A GB 2093035A GB 460221 A GB460221 A GB 460221A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- intermediate frequency
- oscillators
- changing
- television
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
460,221. Wireless receiving systems. MERDLER, L. R., and BAIRD TELEVISION, Ltd. July 23, 1935, No. 20930. [Class 40 (v)] A superheterodyne receiver has permanently connected circuits at the intermediate frequency stage operating at widely different intermediate frequencies, the circuits being brought selectively into effective operation. Such a receiver is applicable for the alternative reception of sound and television. In one arrangement, Fig. 1, two separate frequency changing and intermediate frequency channels 1, 2 are provided, the channel being selected by switching the high and low tension supplies to the oscillators (not shown). The outputs of the intermediate frequency amplifiers 1, 2 are led to two diode detectors 3, 4 which, as shown, have a common cathode and common load impedance 6, 7. In another arrangement, Fig. 2, a single intermediate frequency amplifier 8 is used for both wave bands, the intervalve coupling comprising two band filters 10, 12 in series, 10 being operative at the higher frequency (e.g. 19 megacycles) and 12 at the lower frequency (e.g. 110 kilocycles). Selection may be effected by using two oscillators with switching arrangements as before, or by using a single oscillator and changing its frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2093035A GB460221A (en) | 1935-07-23 | 1935-07-23 | Improvements in or relating to radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2093035A GB460221A (en) | 1935-07-23 | 1935-07-23 | Improvements in or relating to radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB460221A true GB460221A (en) | 1937-01-25 |
Family
ID=10154210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2093035A Expired GB460221A (en) | 1935-07-23 | 1935-07-23 | Improvements in or relating to radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB460221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE955605C (en) * | 1952-07-12 | 1957-01-03 | Blaupunkt Werke G M B H Zweign | Combined television and radio set |
-
1935
- 1935-07-23 GB GB2093035A patent/GB460221A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE955605C (en) * | 1952-07-12 | 1957-01-03 | Blaupunkt Werke G M B H Zweign | Combined television and radio set |
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