GB1503318A - Twoway radio systems - Google Patents
Twoway radio systemsInfo
- Publication number
- GB1503318A GB1503318A GB5149074A GB5149074A GB1503318A GB 1503318 A GB1503318 A GB 1503318A GB 5149074 A GB5149074 A GB 5149074A GB 5149074 A GB5149074 A GB 5149074A GB 1503318 A GB1503318 A GB 1503318A
- Authority
- GB
- United Kingdom
- Prior art keywords
- receiver
- ship
- aerial
- transmitter
- signal
- 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
- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
- H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Transceivers (AREA)
Abstract
1503318 Interference reduction W J MULLARKEY 2 Jan 1976 [27 Nov 1974] 51490/74 Heading H4L In the operation of a two-way radio system there is provided between the aerial (10) Fig. 1 (not shown) and input (12) of the receiver (not shown) an attenuator (14), Fig. 2, bias being provided between terminals 20 and 22 to enable passage of the received signals except upon detection Fig. 3(a) of emanations, from the local transmitter, whose amplitude exceeds a predetermined level, a detector providing the signal Fig. 3(b) which is shaped and extended to provide the signal Fig. 3(d) during whose duration the bias 20, 22 is removed to attenuate the receiver input signal. The arrangement is particularly applied to systems utilizing ssb suppressed carrier. The emanations are detected by means (16) Fig. I (not shown) coupled to the receiver aerial, a separate aerial or to the local transmitter and comprising rectifier (20) differentiator (22) and threshold detector (26) Fig. 4 (not shown) the means (16) being inactive during reception from a remote transmitter. The system, particularly applicable in ship-ship or ship-shore communication, enables substantially simultaneous transmitter and receiver operation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5149074A GB1503318A (en) | 1974-11-27 | 1974-11-27 | Twoway radio systems |
| GB4731776A GB1567932A (en) | 1974-11-27 | 1976-11-12 | Two way radio systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5149074A GB1503318A (en) | 1974-11-27 | 1974-11-27 | Twoway radio systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1503318A true GB1503318A (en) | 1978-03-08 |
Family
ID=10460232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5149074A Expired GB1503318A (en) | 1974-11-27 | 1974-11-27 | Twoway radio systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1503318A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0014110A1 (en) * | 1979-01-23 | 1980-08-06 | Thomson-Csf | Transmitter-receiver and use thereof in a telecommunication network |
-
1974
- 1974-11-27 GB GB5149074A patent/GB1503318A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0014110A1 (en) * | 1979-01-23 | 1980-08-06 | Thomson-Csf | Transmitter-receiver and use thereof in a telecommunication network |
| FR2447650A1 (en) * | 1979-01-23 | 1980-08-22 | Thomson Csf | TRANSCEIVER WITH AUTOMATIC ALTERNATE CONTROL AND TELECOMMUNICATIONS NETWORK INCLUDING SUCH A TRANSCEIVER |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee | ||
| PCPE | Delete 'patent ceased' from journal |
Free format text: JOURNAL NO.4875,PAGE 2528 |
|
| PCNP | Patent ceased through non-payment of renewal fee |