GB658942A - Improvements in or relating to radio repeater stations - Google Patents
Improvements in or relating to radio repeater stationsInfo
- Publication number
- GB658942A GB658942A GB2408149A GB2408149A GB658942A GB 658942 A GB658942 A GB 658942A GB 2408149 A GB2408149 A GB 2408149A GB 2408149 A GB2408149 A GB 2408149A GB 658942 A GB658942 A GB 658942A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- control valve
- grid
- potential
- pentode
- 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
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
Abstract
658,942. Radio signalling. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 19, 1949, No. 24081. [Class 40 (v)] In a V.H.F. radio repeater station transmission is prevented when the signal strength falls below a predetermined value, or the noise level exceeds a predetermined value, by means actuated in dependence upon received signal strength or upon noise level at a predetermined circuit of the station. As shown in Fig. 2 a control voltage, derived from the LF. stage of a repeater of the type in which the received carrier frequency is retransmitted on a slightly different frequency, is applied to the control grid G2 of a control valve. The oscillator of the transmitting portion of the station comprises the tuned circuit L1, C1, and the other half of the double triode, the grid G1 of the oscillator valve being connected through a resistor R2 to the anode A2 of the control valve and through a resistor R3 to earth. While the grid G2 is highly negative with respect to the cathode no current flows through the control valve, the cathode tap T being adjusted so that in this condition the oscillator portion is working normally. When the negative potential on the grid G2 is reduced current commences to flow through the control valve increasing the potential drop across resistor R1 and lowering the potential of the grid G1 until oscillations stop, the position of the tap T or variation of one of the other resistors determining when this occurs. In Figs. 3 and 4 (not shown), this arrangement is applied to crystal controlled oscillators. In Figs. 5 and 6 (not shown), the oscillator valve is a pentode whose screen potential is reduced, to stop oscillations, by the increase of anode current through the control valve. In a further modification, Fig. 7 (not shown), the oscillator comprises a pentode associated with one portion of a double triode which acts as a cathode follower feeding back to the pentode through a piezo-electric crystal, the other portion of the double triode acting as a control valve to stop the oscillator.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL81401D NL81401C (en) | 1949-09-19 | ||
| GB2408149A GB658942A (en) | 1949-09-19 | 1949-09-19 | Improvements in or relating to radio repeater stations |
| FR1010907D FR1010907A (en) | 1949-09-19 | 1950-02-06 | Improvements in retransmission radio stations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2408149A GB658942A (en) | 1949-09-19 | 1949-09-19 | Improvements in or relating to radio repeater stations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB658942A true GB658942A (en) | 1951-10-17 |
Family
ID=10206056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2408149A Expired GB658942A (en) | 1949-09-19 | 1949-09-19 | Improvements in or relating to radio repeater stations |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR1010907A (en) |
| GB (1) | GB658942A (en) |
| NL (1) | NL81401C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3928573A1 (en) * | 1988-08-31 | 1990-03-08 | Yamatake Honeywell Co Ltd | RADIO WAVE ANSWER DEVICE DEVICE IN AN ANSWER SYSTEM |
-
0
- NL NL81401D patent/NL81401C/xx active
-
1949
- 1949-09-19 GB GB2408149A patent/GB658942A/en not_active Expired
-
1950
- 1950-02-06 FR FR1010907D patent/FR1010907A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3928573A1 (en) * | 1988-08-31 | 1990-03-08 | Yamatake Honeywell Co Ltd | RADIO WAVE ANSWER DEVICE DEVICE IN AN ANSWER SYSTEM |
| GB2224183A (en) * | 1988-08-31 | 1990-04-25 | Yamatake Honeywell Co Ltd | Radio transponder apparatus |
| GB2224183B (en) * | 1988-08-31 | 1992-12-23 | Yamatake Honeywell Co Ltd | Radio transponder apparatus in transponder system |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1010907A (en) | 1952-06-17 |
| NL81401C (en) |
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