GB535106A - Emergency signals radio receiver - Google Patents
Emergency signals radio receiverInfo
- Publication number
- GB535106A GB535106A GB2920939A GB2920939A GB535106A GB 535106 A GB535106 A GB 535106A GB 2920939 A GB2920939 A GB 2920939A GB 2920939 A GB2920939 A GB 2920939A GB 535106 A GB535106 A GB 535106A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emergency
- stages
- screens
- channel
- normal
- 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
- H04B1/06—Receivers
- H04B1/08—Constructional details, e.g. cabinet
Abstract
535,106. Wireless signalling. WALKER, W. A. H. Nov. 2, 1939, No. 29209. [Class 40 (v)] A radio receiver comprises a normal receiving channel and an emergency receiving channel tuned to to a pre-determined wavelength, the arrangement being such that when a signal is received on the emergency wavelength the normal channel is rendered inoperative. The normal channel comprises the H.F. amplifier V1, frequency changer V2 and I.F. amplifier V3 the output from which passes to further I.F. and A.F. stages not shown. The emergency channel comprises the corresponding H.F., F.C., and I.F. stages V4, V5, V6, the output from which passes to the same audio-frequency stages. A lead is taken from the grid of V6 to a pair of amplifiers V8, V9 which provide a voltage for V10 which is normally biased to cut-off by the main negative feed-resistance R. The anode feed resistances of V10 are common to the screens of V1 and V2 the point x being connected to the screens of V1 and V2. The arrival of an emergency signal reduces the negative bias of valve V10 so that the increased anode current reduces the voltage on the screens of VI and V2 to render the normal channel inoperative. The emergency signal passes by way of link A, B to the output stages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2920939A GB535106A (en) | 1939-11-02 | 1939-11-02 | Emergency signals radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2920939A GB535106A (en) | 1939-11-02 | 1939-11-02 | Emergency signals radio receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB535106A true GB535106A (en) | 1941-03-28 |
Family
ID=10287876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2920939A Expired GB535106A (en) | 1939-11-02 | 1939-11-02 | Emergency signals radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB535106A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3031570A (en) * | 1959-01-16 | 1962-04-24 | John K O'neil | Signal receiving system |
| GB2211701A (en) * | 1987-10-27 | 1989-07-05 | Kevin Stanley Fuller | An audio frequency sensing switch |
-
1939
- 1939-11-02 GB GB2920939A patent/GB535106A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3031570A (en) * | 1959-01-16 | 1962-04-24 | John K O'neil | Signal receiving system |
| GB2211701A (en) * | 1987-10-27 | 1989-07-05 | Kevin Stanley Fuller | An audio frequency sensing switch |
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