| 摘要 |
A transmitting and receiving system having two or more radios, each capable of transmitting and re- ceiving a transmission signal on two or more radio frequencies where a first radio transmits on a selected frequency at a predetermined time interval and a second radio recovers the transmitted signal. The second radio has a first intermediate frequen- cy generator which generates an intermediate fre- quency signal which is substantially equal to an integer multiple of the channel spacing whereby an image response corresponding to the selected fre- quency is separated by twice the intermediate fre- quency signal from the selected frequency. Thus, locations for the two or more transmission frequen- cies can be selected so as not to be located on the image responses corresponding to any and all of the two or more transmission frequencies.
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