Title: Device for a radio station comprising a jammer

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1. An arrangement at a radio station including a frequency modulated transmitter unit for jamming, a receiver unit for the reception of externally generated signals and a mixer preceding the receiver unit, the one input of the mixer being connected to a receiver antenna circuit and the second input to the output circuit of the transmitter unit, the carrier of which is frequency modulated according to an arbitrary function of time, said receiver unit is tuned to receive a frequency including side bands which lies within one range of beat frequencies produced by the mixer, varying in dependence of the transmitter unit modulation wave, an indicating device indicating the presence of output signals of the receiver unit in dependence of carrier frequencies received which lie within essentially the range of frequencies transmitted by the transmitter unit, said receiver unit including two receivers tuned to different frequencies the inputs of the receivers are fed by the mixer in parallel the output of the one receiver is connected to the one input of an AND circuit the output of which is connected to the display device or electroacoustic device, and the output of the second receiver is connected to second input of the AND circuit via a time delay circuit which provides a time delay equal to the time interval between two successive output pulses delivered in turn by the two receivers in dependence of one received signal, the AND circuit being such that it passes coinciding pulses.

2. An arrangement at a radio station including a frequency modulated transmitter unit for jamming, a receiver unit for the reception of externally generated signals and a mixer preceding the receiver unit, the one input of the mixer being connected to a receiver antenna circuit and the second input to the output circuit of the transmitter unit, the carrier of which is frequency modulated according to an arbitrary function of time, said receiver unit is tuned to receive a frequency including side bands which lies within one range of beat frequencies produced by the mixer, varying in dependence of the transmitter unit modulation wave, an indicating device indicating the presence of output signals of the receiver unit in dependence of carrier frequencies received which lie within essentially the range of frequencies transmitted by the transmitter unit, said receiver unit including a first and second receiver tuned to different frequencies the inputs of the receivers are fed by the mixer in parallel the output of the receivers each are connected to the one input of a first and a second AND circuit via a first and a second time delay circuit respectively involving a time delay equal to the time interval between two successive output pulses delivered in turn by the two receivers in dependence of one received signal, the second input of the said first AND circuit is connected to the output of the said second receiver and the second input of the said second AND circuit is connected to the output of the said first receiver.

Other info:

Inventors: Weidstam, Eskil (Stockholm, SW)

Application Number: 024912
Filing Date: 1970-03-17
Publication_date: 1976-04-27
Assignee:
Primary Class(es): 342/14
Other Classes:
US Patent Ref:

2965896	Dec, 1960	Wright et al.	343/14.
3109172	Oct, 1963	Hardinger et al.	343/14.
3195130	Jul, 1965	Adrian	343/18.

Other Refs:
Primary Examiner: Hubler, Malcolm F.
Assistant Examiner:
Attorney: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.