Title:
【発明の名称】トランシーバ
Document Type and Number:
Japanese Patent JP3063089
Kind Code:
B2
Abstract:
A time division duplex transceiver incorporating a dual conversion superheterodyne receiver, and in which the first receiver local oscillator (6) doubles as the frequency source for the transmitter. The oscillator (6) is a voltage controlled oscillator VCO forming part of a mixer-type phase locked loop (21). Frequency deviation in the loop is achieved by mixing the VCO output with a selected harmonic of the output of the second receiver local oscillator (11). The reference oscillator is a crystal controlled oscillator (41) whose output is switched as between transmit mode and receive mode at a switch (55) before being passed to the loop phase detector (28). The transceiver is able to rapidly and repeatedly alternate beween transmit and receive modes and is thus well suited to time division multiplex operation.
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Inventors:
Graham Edgar Beesley
Application Number:
JP6233789A
Publication Date:
July 12, 2000
Filing Date:
March 16, 1989
Export Citation:
Assignee:
81&T Wireless Communications Products Limited
International Classes:
H04B1/56; H04B1/40; (IPC1-7): H04B1/40
Domestic Patent References:
| JP5157116A | ||||
| JP5553929A | ||||
| JP60183856A |
Attorney, Agent or Firm:
Keiichi Yamamoto