GB1347476A - Transmitter/receiver apparatus - Google Patents

Transmitter/receiver apparatus

Info

Publication number
GB1347476A
GB1347476A GB1347476DA GB1347476A GB 1347476 A GB1347476 A GB 1347476A GB 1347476D A GB1347476D A GB 1347476DA GB 1347476 A GB1347476 A GB 1347476A
Authority
GB
United Kingdom
Prior art keywords
beacon
mhz
frequency
voice
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
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ultra Electronics Ltd
Original Assignee
Ultra Electronics Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ultra Electronics Ltd filed Critical Ultra Electronics Ltd
Publication of GB1347476A publication Critical patent/GB1347476A/en
Expired legal-status Critical Current

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
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • 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

Abstract

1347476 Radio beacon ULTRA ELECTRONICS Ltd 19 April 1971 [14 April 1970] 17627/70 Heading H4L A radio beacon, especially a distress beacon for use on aircraft, at sea, &c., can transmit and receive voice information as well as transmit the beacon signal. The voice transmission and reception can be on one of two channels the received signal being mixed (17) with the other one of the channel frequencies from that used for the voice carrier to yield a constant IF for the common IF stages 18. For each frequency 243À0 MH 3 and 282À8 MH 3 , an oscillator, 7/10 and frequency doublers, 8, 9/11, 12 are provided. Transducer 3 is a microphone in the transmission mode, and a loud-speaker in the reception mode. Two way, five pole switch 2 has arms performing the following functions (shown positions functions being given first), OFF/ON, TX/RX, 243À0 MHz/282À8 MHz, voice/beacon and use as heterodyne signal 282À8 MH 3 /243À0 MHz. The beacon signal is at 243À0 MHz only and is ON/OFF modulated at 5 by the variable frequency output of tone generator 6 and chopper 21. The outputs of the frequency doublers are fed to the mixer or transmitter power amplifier under the control of isolating switched diodes. Additional channels can be catered for by using local oscillators having frequency differences equal to the constant IF.
GB1347476D 1971-04-19 1971-04-19 Transmitter/receiver apparatus Expired GB1347476A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1762770 1971-04-19

Publications (1)

Publication Number Publication Date
GB1347476A true GB1347476A (en) 1974-02-27

Family

ID=10098450

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1347476D Expired GB1347476A (en) 1971-04-19 1971-04-19 Transmitter/receiver apparatus

Country Status (1)

Country Link
GB (1) GB1347476A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2557403A1 (en) * 1983-12-27 1985-06-28 United Technologies Corp ELECTRICALLY SWITCHED MICROWAVE RECEIVER RECEIVER OPERATING IN INTEGRAL DUPLEX

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2557403A1 (en) * 1983-12-27 1985-06-28 United Technologies Corp ELECTRICALLY SWITCHED MICROWAVE RECEIVER RECEIVER OPERATING IN INTEGRAL DUPLEX

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees