Communication apparatus for transmitting and receiving signals o

Details Communication apparatus for transmitting and receiving signals o Communication apparatus for transmitting and receiving signals o

1984-12-26

1986-12-02

Ng, Jin F.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 86, H04B 140

Patent

active

046270990

ABSTRACT:
A communication apparatus comprises a first oscillator for generating a frequency fp.sub.1 at each channel step; a second oscillator for generating a modulated frequency fp.sub.2 ; a first mixer for creating a transmission frequency which is a sum fp.sub.1 +fp.sub.2 of the frequencies of the first and second oscillators and a difference fp.sub.1 -fp.sub.2 therebetween on high and low band transmissions respectively; a third oscillator for generating a frequency fp.sub.3 which is higher or lower than the frequency fp.sub.2 of the second oscillator by a given frequency .DELTA.f; and a second mixer for creating a sum fp.sub.1 +fp.sub.3 of the frequencies of the first and third oscillators means and a difference fp.sub.1 -fp.sub.3 therebetween on low and high band transmissions respectively.

REFERENCES:
patent: 3435367 (1969-03-01), Little, Jr.
patent: 4086545 (1978-04-01), Teshirogi
patent: 4231116 (1980-10-01), Sekiguchi et al.
patent: 4449250 (1984-05-01), Kurby
patent: 4450583 (1984-05-01), Strobel et al.

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