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US 4,542,531 AGranted
Radio transmitter/receivers with non interferring local oscillator frequency
AssigneeNippon Electric Co., Ltd.
InventorYukio Fukumura
Life of this patent
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Abstract
In a radio transmitter/receiver comprising a transmitter, a superheterodyne receiver, and a local oscillator for supplying a local oscillation signal to the superheterodyne receiver, the intermediate frequency f.sub.if of the superheterodyne receiver is set to have a value expressed by f.sub.if =(2K-1).times.f.sub.ch /2 where f.sub.ch represents a frequency spacing between radio frequencies assigned to a communication and K represents a natural number.
Claims3
A radio transmitter/receiver comprising:
- a transmitter;
- a superheterodyne receiver, and
- a local oscillator for supplying said transmitter and receiver with local signals at a plurality of frequencies;
- said transmitter and receiver operation on a plurality of radio channels with different transmission and reception frequencies for each channel said transmission and reception frequencies being a natural number multiple of the frequency spacing between said radio channels and the output frequencies of said local oscillator being between the transmission frequencies of two adjacent channels
- mixing means in said receiver for mixing an output from said local oscillator with a reception frequency to provide an intermediate frequency f.sub.if wherein said intermediate frequency f.sub.if of said superheterodyne receiver is set to have a value expressed by
- f.sub.if =(2K-1).times.f.sub.ch /2
- where f.sub.ch represents a frequency spacing between radio frequencies assigned to adjacent channels, and K represents a natural number.
4 more elements
Dependencies are inferred from the claim text.