GB572783A - Combined radio transmitter and loud speaker installation - Google Patents
Combined radio transmitter and loud speaker installationInfo
- Publication number
- GB572783A GB572783A GB316944A GB316944A GB572783A GB 572783 A GB572783 A GB 572783A GB 316944 A GB316944 A GB 316944A GB 316944 A GB316944 A GB 316944A GB 572783 A GB572783 A GB 572783A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radio transmitter
- loudspeaker
- audio
- loud speaker
- combined radio
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
-
- 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
- H04B1/02—Transmitters
- H04B1/04—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transmitters (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
572,783. Combined wireless and loudspeaker apparatus. INTERNATIONAL MARINE RADIO CO., Ltd., and WITHEY, C. G. G. Feb. 21, 1944, No. 3169. [Class 40 (iv)] [Also in Group XL] In a combined radio transmitter and loudspeaker installation for use on ships, a twoway switch S1 connects an audio-frequency amplifier V3, V4 alternatively to the modulation stage of the radio transmitter and to the loudspeaker LS, and an additional microphone, which may be located on the bridge of the ship and which includes a pressel switch, is connected to wires M3 in parallel with the normal instrument. As shown in Fig. 1, plate circuit modulation is employed and the removal of the audio-frequency input disconnects the high-tension supply. When grid circuit modulation is employed, Fig. 2 (not shown), a second audio-frequency amplifier is provided for feeding the loudspeaker.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE476384D BE476384A (en) | 1944-02-21 | ||
GB316944A GB572783A (en) | 1944-02-21 | 1944-02-21 | Combined radio transmitter and loud speaker installation |
ES175300A ES175300A1 (en) | 1944-02-21 | 1946-10-15 | `IMPROVEMENTS IN OR RELATED TO COMBINED RADIOTRANSMITOR AND SPEAKER INSTALLATIONS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB316944A GB572783A (en) | 1944-02-21 | 1944-02-21 | Combined radio transmitter and loud speaker installation |
Publications (1)
Publication Number | Publication Date |
---|---|
GB572783A true GB572783A (en) | 1945-10-23 |
Family
ID=9753224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB316944A Expired GB572783A (en) | 1944-02-21 | 1944-02-21 | Combined radio transmitter and loud speaker installation |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE476384A (en) |
ES (1) | ES175300A1 (en) |
GB (1) | GB572783A (en) |
-
0
- BE BE476384D patent/BE476384A/xx unknown
-
1944
- 1944-02-21 GB GB316944A patent/GB572783A/en not_active Expired
-
1946
- 1946-10-15 ES ES175300A patent/ES175300A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES175300A1 (en) | 1946-11-16 |
BE476384A (en) |
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