GB695326A - An improved light portable short-wave transmitter-receiver requiring no adjustment - Google Patents
An improved light portable short-wave transmitter-receiver requiring no adjustmentInfo
- Publication number
- GB695326A GB695326A GB11703/51A GB1170351A GB695326A GB 695326 A GB695326 A GB 695326A GB 11703/51 A GB11703/51 A GB 11703/51A GB 1170351 A GB1170351 A GB 1170351A GB 695326 A GB695326 A GB 695326A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- crystal
- grid
- short
- inductance
- 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
-
- 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
- H04B1/3827—Portable transceivers
- H04B1/385—Transceivers carried on the body, e.g. in helmets
-
- 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
- H04B1/3827—Portable transceivers
- H04B1/385—Transceivers carried on the body, e.g. in helmets
- H04B2001/3855—Transceivers carried on the body, e.g. in helmets carried in a belt or harness
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
695,326. Radio transmitting and receiving apparatus; valve super-regenerative circuits. BENOIT, J., and SZEPESI, Z. May 18, 1951 [May 26, 1950], No. 11703/51. Class 40 (v). A portable short-wave transmitter-receiver comprises a crystal-controlled oscillator for transmission, and a super-regenerative receiver, the crystal being short-circuited during reception. With the send-receive switches at E the transmitter comprises an oscillator T1 controlled by the crystal 14, followed by a high-frequency amplifier T2. The grid of the modulating valve T3 is connected to a piezo-electric throat microphone 33 and the output from T3 is amplified by the valve T4 and modulates the screen of valve T2. The headset 30 is connected via capacitor 76 to the anode of valve T4 to provide sidetone. With the send-receive switches at R the crystal 14 is short-circuited and the screen grid of T1 disconnected, and the receiver comprises the valve T2 which becomes a high-frequency oscillator interrupted by means of the grid circuit which has a time constant dependent on the resistor 19, inductance 20, and capacitor 21, the inductance 20 preventing the grid from being earthed for highfrequency through the capacitor 21. The aerial 11 is connected to the anode of valve T2 and the detected signal appears across the inductance 23, is amplified by valves T3 and T4, and applied to the headset 30 via transformer 31. In an alternative arrangement, Fig. 7 (not shown), the functions of high-frequency amplifier for transmission and super-regenerative detector for reception are carried out by separate valves. Power is provided by a twovolt accumulator 40, a series resistor 41<SP>1</SP> dropping the voltage to 1.4 volts for the heaters, and a vibrator 43 providing the H.T. An additional winding on the transformer 44 provides through a rectifier 56 a negative voltage to bias the valve T4. The accumulator can be recharged without removing it from the case by connecting the charger to a coaxial attachment 97 and operating the switch 92. The apparatus fits into a small metal box and is fastened by straps into a shelf-like carrier of aluminium which is attached to the chest of the operator, the rod aerial being arranged well clear of the operator's body.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1019731T | 1950-05-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB695326A true GB695326A (en) | 1953-08-05 |
Family
ID=9575864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11703/51A Expired GB695326A (en) | 1950-05-26 | 1951-05-18 | An improved light portable short-wave transmitter-receiver requiring no adjustment |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE503536A (en) |
FR (2) | FR1019731A (en) |
GB (1) | GB695326A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7639824B2 (en) | 2003-09-04 | 2009-12-29 | Franzen Bo | Noise damping headset with a throat microphone |
-
0
- BE BE503536D patent/BE503536A/xx unknown
-
1950
- 1950-05-26 FR FR1019731D patent/FR1019731A/en not_active Expired
-
1951
- 1951-05-10 FR FR61758D patent/FR61758E/en not_active Expired
- 1951-05-18 GB GB11703/51A patent/GB695326A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7639824B2 (en) | 2003-09-04 | 2009-12-29 | Franzen Bo | Noise damping headset with a throat microphone |
Also Published As
Publication number | Publication date |
---|---|
FR1019731A (en) | 1953-01-26 |
BE503536A (en) | |
FR61758E (en) | 1955-05-17 |
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