SU1764171A1 - Testing device for multichannel repeater - Google Patents

Abstract

Use: radio engineering. The essence of the invention: the device contains 1 transmitter (1). 1 test translator (2), 1 receiver (3). 1 block (4) of instrumentation, 1 repeater (5), 1 noise source (6), 1 bandpass filter (7), 2 ramizers (8.10). 1 block

Description

The invention relates to radio engineering measurements, namely to measurements of parameters of active four-terminal networks with input and output different frequencies, and can be used for. measuring indicators of the repeater (frequency characteristics, noise characteristics, output power level, etc.). The purpose of the invention is to increase the reliability of control by ensuring the loading of all channels. . ·

The drawing shows the electrical structural diagram of the device.

The device comprises a transmitter 1, a test translator 2, a receiver 3, a control instrumentation unit 4, a tested repeater 5. a noise source 6. a band-pass filter 7, a first splitter 8, a switching unit 9, a second splitter 10. adder 11 switch 12. control unit 13.

The device operates as follows. .

The noise source 6 performs the function of a high-temperature broadband noise source; an avalanche diode is used as an active element of the noise generator. ί

The band-stop filter 7 has a bandwidth equal to the frequency band in which the control transmitter operates (channel bandwidth), and is made on a fierit band-pass filter and a circulator. As splitters 8, 10 applied bridges and directional couplers. and as block 9 switching ~ switches and taps.

The adder 11 combines the outputs of the repeater channels into one common channel and is made on bridges.

The switch 12 is made on ferrite. As the control unit 13, a control panel on push-button switches and relays is used. The control unit can also be implemented using microprocessor technology or microcomputers.

/ In the self-monitoring mode, the test signal from the transmitter 1 is sent to the test translator 2, then the frequency-converted signal through the switch 12 is sent to the receiver 3. The frequency transfer in the test translator is exactly the same amount as in the repeater. In block 4 of the control and measuring equipment, information is recorded about the parameters of test translator 2, which has several times higher quality indicators than the tested repeater.

When monitoring, for example, frequency characteristics (AFC, GVZ, DU and DF) the transmitter is modulated by a low-frequency signal coming from block 4 of the control and measuring equipment.

The operation mode corresponding to the test channel for the transmitter 1, receiver 3 and switching unit 9 is set by the control unit 13.

In the control mode of the repeater 5, the test signal from the transmitter 1 through the splitter 10 is fed to the switching unit 9 and, depending on the position of its switch, is sent to one of the inputs of the studied relay 5, and then through the adder 11 and the switch 12 to the receiver 3. The switch 12 is used to transferring the control device from self-monitoring mode to measurement mode. At the same time from the noise source 6 through the band-stop filter 7, the splitter 8 and the switching unit 9 to the input of the relay 5 receives a broadband noise signal. Filter 7 cuts out a part of the band of the noise signal equal to the band of the operating frequencies of the transmitter 1, in which the relay 5 is monitored. The remaining channels of the relay “are loaded with a noise signal. Information about the parameters of the controlled channel of the relay 5 is received at the receiver 3 and then is recorded in the block 4 of the control and measuring equipment. The operating mode of the band-stop filter 7 and block 4 of the control and measuring equipment is set by the control unit 13.

Claims (1)

Claim A device for monitoring a multi-channel repeater containing a series-connected receiver, a block of instrumentation and a transmitter, a test translator, characterized in that, in order to increase the reliability of control by ensuring the loading of all channels, a control unit is introduced, connected in series to a noise source, a blocking filter, the control input of which is connected to the corresponding output of the control unit, the first splitter and switching unit, the outputs of which are signal inputs of the studied repeater, a series-connected adder, the inputs of which are the signal inputs from the outputs of the studied repeater, and a switch, the output of which is connected to the information input of the receiver, the control input of which is connected to the corresponding output of the control unit, in addition, the second time the coupler, the input of which is connected to transmitter output, one output is connected to the input of the test translator, and the other output is connected to the · corresponding input of the switching unit, the output of the test translator is connected to the 5 second in Switching Valid ormatsionnomu ents, respective outputs of the control unit are connected to respective control inputs of the transmitter, respectively, the unit control devices, and the switching unit of the switch.