As indicated above, it has a transmission system 4 and a reception system 5. This station is connected to an antenna 2 via a waveguide 3. A terminal station 1 is represented in Figure 1. Since radio beams are two-directional, each of these stations has a reception system and a transmission system. Radio links are organized around terminal stations and relay stations. The application of the invention lies, more particularly, in the production of equipment for directional millimetre radio. The present invention relates to a remote loop-back device intended to frequency-transpose a microwave signal of frequency fl into a microwave signal of frequency f2.
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