GB1485810A - Telecommunications receivers - Google Patents
Telecommunications receiversInfo
- Publication number
- GB1485810A GB1485810A GB5153674A GB5153674A GB1485810A GB 1485810 A GB1485810 A GB 1485810A GB 5153674 A GB5153674 A GB 5153674A GB 5153674 A GB5153674 A GB 5153674A GB 1485810 A GB1485810 A GB 1485810A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channel
- mhz
- frequency
- receiver
- spaced
- 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
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/02—Indicating arrangements
- H03J1/04—Indicating arrangements with optical indicating means
- H03J1/045—Indication of the tuning band, the bandwidth, tone control, the channel number, the frequency, or the like
- H03J1/047—Indication of the tuning band, the bandwidth, tone control, the channel number, the frequency, or the like using electronic means, e.g. LED's
- H03J1/048—Indication of the tuning band, the bandwidth, tone control, the channel number, the frequency, or the like using electronic means, e.g. LED's with digital indication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Circuits Of Receivers In General (AREA)
- Superheterodyne Receivers (AREA)
- Transceivers (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Electric Clocks (AREA)
Abstract
1485810 Measuring frequency; indicating channel number LICENTIA PATENT-VERWALTUNGS GmbH 28 Nov 1974 [18 Dec 1973] 51536/74 Headings H3H and H3Q The number of a channel to which a superheterodyne receiver is tuned is indicated by digitally measuring the frequency of the local oscillator in the receiver, effectively adding or subtracting the intermediate frequency of the receiver and further subtracting a reference frequency corresponding to the lowest numbered channel. The channels may be spaced at 300 kHz, starting with channel 0 at 87 MHz. There may be three transmitters for each channel spaced at 100 kHz identified as, e.g. 0_ (86-9 MHz), 0 (87 MHz) and 0+ (87-1 MHz) the -, nothing or + being derived from the final state of a counter 6 acting as a divide-by-three circuit. The Fig. 2 arrangement includes means 20 for selecting frequency or channel number to be displayed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732362853 DE2362853C3 (en) | 1973-12-18 | 1973-12-18 | Circuit for the digital display of the received transmitters in a heterodyne receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1485810A true GB1485810A (en) | 1977-09-14 |
Family
ID=5901106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5153674A Expired GB1485810A (en) | 1973-12-18 | 1974-11-28 | Telecommunications receivers |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5630977B2 (en) |
| DE (1) | DE2362853C3 (en) |
| FR (1) | FR2254910B1 (en) |
| GB (1) | GB1485810A (en) |
| HK (1) | HK5680A (en) |
| IT (1) | IT1027636B (en) |
| MY (1) | MY8100009A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4222120A (en) * | 1977-08-08 | 1980-09-09 | Rca Corporation | Tuning position display system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919496B2 (en) * | 1978-04-03 | 1984-05-07 | シャープ株式会社 | frequency counter |
| JPS5531391A (en) * | 1978-08-28 | 1980-03-05 | Sanyo Electric Co Ltd | Receiver |
| EP0009617B1 (en) * | 1978-08-28 | 1984-03-14 | Sanyo Electric Co., Ltd. | Circuit for controlling a receiving frequency and a channel display in a superheterodyne receiver |
-
1973
- 1973-12-18 DE DE19732362853 patent/DE2362853C3/en not_active Expired
-
1974
- 1974-11-28 GB GB5153674A patent/GB1485810A/en not_active Expired
- 1974-12-12 IT IT3048974A patent/IT1027636B/en active
- 1974-12-16 JP JP14434574A patent/JPS5630977B2/ja not_active Expired
- 1974-12-18 FR FR7441806A patent/FR2254910B1/fr not_active Expired
-
1980
- 1980-02-21 HK HK5680A patent/HK5680A/en unknown
-
1981
- 1981-12-30 MY MY8100009A patent/MY8100009A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4222120A (en) * | 1977-08-08 | 1980-09-09 | Rca Corporation | Tuning position display system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2362853C3 (en) | 1978-04-13 |
| FR2254910B1 (en) | 1980-06-27 |
| MY8100009A (en) | 1981-12-31 |
| JPS5093513A (en) | 1975-07-25 |
| DE2362853A1 (en) | 1975-06-19 |
| HK5680A (en) | 1980-02-29 |
| FR2254910A1 (en) | 1975-07-11 |
| DE2362853B2 (en) | 1977-08-18 |
| JPS5630977B2 (en) | 1981-07-18 |
| IT1027636B (en) | 1978-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931128 |