Circuit arrangement for the insertion of telephone channels in the intermediate frequency junctions for repeater stations

Claim 1

In a circuital arrangement for the insertion of additional communication channels such as telephone channels and the like in the intermediate frequency junctions of repeater stations comprising a first mixer, an intermediate frequency amplifier connected to said first mixer, a first frequency conversion oscillator providing an oscillaTion angle modulated with the information of the communication channels to be inserted, said first frequency conversion oscillator being connected to said first mixer, a second mixer a band pass filter connected between the output of said first mixer and the input of said second mixer, a second frequency conversion oscillator connected to said second mixer, an output amplifier connected to the output of said second mixer, a first frequency divider whose input is connected to the output of said intermediate frequency amplifier, a second frequency divider connected to the output of said output amplifier, a phase detector, the output of said frequency dividers being connected to the inputs of said phase detector, the output of said phase detector being connected to a frequency control input of said second conversion oscillator, whereby said frequency dividers remove the angle modulation from the signals due to useful information to obtain a long term frequency stability of the output signal.