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Radio relay channel branch cascade exhibiting uniform transit-time-and-attenuation-characteristics of all channels

  • US 4,161,694 A
  • Filed: 06/24/1977
  • Issued: 07/17/1979
  • Est. Priority Date: 06/28/1976
  • Status: Expired due to Term
First Claim
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1. A multi-channel radio relay system in which a plurality of high-frequency channels are provided in a link between a transmitting and a receiving station, said channels being combined at the transmitting station to form a common high-frequency group over a cascade circuit comprising channel branch elements, each of which contains a circulator and a band-pass filter, and separated at the receiving station over a similar cascade circuit, the allocation of frequencies being such that each channel passes over an equal number of circulators in said link, the edge channel of highest frequency being allotted to the circulator, of one of said cascades, most remote from the antenna associated therewith, and with the circulator, of the other cascade, closest to the antenna associated therewith, the edge channel of lowest frequency being allocated to the circulator of each cascade at the opposite end to that allotted to the highest frequency, all of said circulators being similarly arranged in their respective cascades, the band-pass filter of each cascade connected to the circulator most remote from the associated antenna being detuned by an amount Δ

  • f, from its middle channel frequency in the direction of the middle frequency of the channel adjacent in frequency position, and the remaining band-pass filters being tuned to the middle frequency of the channel involved.

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