SU1215182A1 - Device for automatic measuring of relative level of power of stray radiation of radio transmistter - Google Patents

Description

i t-M, -n fHKa 38, which is the normalization of this mode. The 32 nm puppies counter has 12 outputs, which receive switching pulses for the operation of the corresponding units. The goal is achieved by introducing IWC 37, two FSS 35.36, block

The invention relates to radio engineering and can be used to measure and control the production of radio transmitters.

The purpose of the invention is to improve accuracy while reducing the measurement time.

The drawing shows a structural electra; The schematic diagram of the proposed device.

The device for automatic measurement of the relative power level of the spurious radiation of the radio transmitter includes a switch 1, a generator of 2 sound frequencies, a memory block 3, a signal level adjustment unit 4, a master oscillator 5, a modulator 6, a first signal divider 7, a phase shifter 8, a control unit 9 amplitudes and phases, bandpass filter 10, compensation block 11, noise generator 12, attenuator 13, second and third dividers 14.15 signals, tunable filter 16, comparison block 17, operating mode recognition block 18, consisting of tunable The resonator 19, the detector 20, the reference voltage generator 21, the comparison unit 22 and the control voltage generator 23, the first decoder 24, the first reference generator 25, the second decoder 26, the second reference generator 27, the third decoder 28, the third reference generator 29, fourth decoder 30, quarter reference generator 31, pulse counter 32, clock pulse generator 33, control unit 34, first and second filters 35.36 with (1 selective selection, conversion); pppg (11t 37 signal frequencies, also ppc h apr (.rpem1 1Y radio transmission; D-1ChT1- 4,

1215182

34 control, generator 33 clock pulses, counter 32 pulses, block 3 of memory, four decoders 24,26,28,30, four reference generators 25,27,29,31, BRRR 18 and the implementation of the PF 10 tunable. 1 3. .. f-ly, 1- CPU.

The device works as follows.

From the output of the radio transmitter 38, the signal under study through the switch 1 is fed to the converter 37 and the operation mode recognition block I8. Inverter 37 is fed, for example, through a modulator, 6 from a master oscillator with a frequency of 5,

ensuring the operation of the device

at the intermediate frequency, the overlap of the signal of the intermediate frequency goes to the first divider 7, which is the power of the signal

in terms of so that 2/3 of it enters the floor (matte filter 10 through the first filter 35, and 1/3 of the power - on the signal level adjusting unit 4, and from it - on the array - to the phase shifter 8, where the signal is converted to the signal of the opposite phase is then fed to block 11.

In order to prepare the device for operation, the calibration block 17 is calibrated. With this signal, the noise generator 12 is turned on and a voltage is applied to the comparison block 17 via an attenuator 13. Moreover, the attenuator 13 allows one to compare the same input of the block 17 to the noise level without suppression, and to introduce attenuation to the other, thus controlling the readings in decibels on the comparison block 17, depending on the attenuation introduced in the attenuator I3, calibration is performed. The first filter 35 of concentrated selection provides bandwidth in the telephone STLF mode of operation of the radio transmitter 38 (RIDA), and the band filter 10 with electronic band tuning provides other modes of operation)

3

the transmitter 38. The band-pass filter 10 together with the first filter 35 cuts out from the signal only that part of the emission spectrum of the radio transmitter 38, which is normalized for this mode. Block 18 provides recognition of the radio transmitter 38 operation mode. By sequential tuning of the tunable resonator 19 using the reference voltage generator 21 and feedback ring: detector 20 is generator 21, the maximum signal level at the detector output 20 is set. After tuning the tunable resonator 19 to the working frequency of the RPU 38 using a command from the pulse counter 32, the generator 21 of the reference voltage is switched to the detection of the working strip by changing the width of the tunable band ezonatora 19 provided the maximum power level at the output of the detector 20 which is compared with the power generator 21 at block 22 comparing. Exceeding the power level over the reference one ensures that the control signal is generated by the driver 23 for all decipherors 24, 26, 28 and 30. The latter control the reference oscillators 25,27,29,31, respectively, to tune the master oscillator 5 to a frequency equal to Fjr 2 audio frequencies at the maximum frequency of the working band, estimated by block 18 and corresponding to the operation mode of the RPDU 38, rebuilding of the bandpass filter 10 to the strip corresponding to the operation mode of the RPU 38 as well as the tuning of the tunable filter 16 and The second filter 36. The second filter 36 of concentrated selection provides the maximum bandwidth corresponding to the TLF RPDA 38 mode, the tunable filter 16 provides the passband for other modes of operation of the RPU 38.

For normal operation of the device and performing a sequence of operations in the process of measuring the relative power level of the parasitic radiation of the radio transmitter 38, a clock pulse generator 33 is used. After setting the device to the operating mode on the control unit 34, the generator 33 is turned on,

15182

from the output of the latter, a sequence of pulses enters the counter of 32 pulses. The counter of 32 pulses has twelve outputs, which receive switching pulses, which ensure the operation of the corresponding blocks. From the pulse sequence of the generator 33, the first switching pulse post10 goes through the seventh output of the pulse counter 32 to the switch, ensuring the connection of the RPDA 38 to the operation mode recognition unit 18. Second switching pulse

15, through the first output of a 32 nm pulse counter, is fed to the reference voltage generator 21, starting it. The voltage of the oscillator 21 tunes the tunable resonator 19.

20 A comparison unit 22 is connected to the output of the latter via a detector 20. When a signal appears at the output of a tunable resonator 19 that exceeds the signal of the reference voltage generator 21, the comparison unit 22, by feedback, detects the oscillator 21 in a steady state, in which the tunable resonator 19 is tuned to the signal of the RPDA 38,

The maximum tuning is controlled by the connection of the generator 21 with the detector 20. 1 1 the width of the band, emitted by the SSB 38, is estimated by the excess power level of the WPC 38 over

j the normalized power level of the generator 21, the Third switching pulse - through the second output of the counter 32 pulses enters the driver 23, the latter produces

40 control signals to all decoders 24,26,28 and 30, providing preparation for operation of all reference generators 25,27,29 and 31, the operation mode of which is established by a twist switching pulse, coming through, the corresponding outputs of the counter 32 pulses. At the same time, a fourth commuting pulse is provided for each.

the correct decoder 30 of information in the memory block 3 on the operating frequency of the RPDU 38.

A smart switching pulse through the twelfth output of the pulse counter 55 pulses 32 is fed to the modulator 6, providing a connection of the modulated signal of the intermediate frequency to the first divider 7 of the signal and the block 18. The seventh switching pulse goes through the fourth output of the counter 32 pulses to the third decoder 28 , providing the creation of a mono voltage at the output of the third reference generator 29. This voltage reconstructs the sound frequency generator 2 in the range from a few hertz to several kilohertz. The transparency bandwidth of the bandpass filter 10 and the tunable filter 16 and the tuning accuracy of the oscillator 5 are checked. Block 18 controls the tuning accuracy of the oscillator 5, for which the seventh, eighth, ninth and tenth sequential pulses are received through the corresponding outputs of the pulse counter 32. . The period of adjustment of the audio frequency generator 2 corresponds to the passage of seven clock pulses. In the case of inaccurate tuning of the proposed device, when the signals of the audio frequency generator 2 enter the bandwidth of the tunable filter I6 and arrive at the input of the pulse counter 32 and return the proposed device to its initial state, then the entire analysis cycle of the RPA 38 signal starts again.

When fine tuning the proposed device in the initial test period, the signal arrives only at block 17 of the comparison with the output of the second signal divider 14.

When going through the prose strip

The difference between the band-pass filter 10 of the audio-frequency generator 2 appears on the comparison block 17 from the output of the third divider 15. This moment is recorded on the control block 34. The latter control signal stops the restructuring of the proposed device. The control unit 34 simultaneously receives signals from the third reference generator 29 and the comparison unit 17. By binding to a single time, the counting of these two signals in the control panel 34 is performed by displaying the transparency band of the band-pass filter 10 at the time of preparing the proposed device for operation. From control unit 34, a connection command is sent to be monitored

jo 15 20 5 o

five

ten

five

0

RPDU 38 serves the fourteenth switching pulse through the corresponding outputs of the counter 32 pulses. Switch 1 connects the signal from the RPU 38 to the converter 37, memory block 3 using the command of the fourth decoder 30 prepares the fourth reference oscillator 31, the latter rearranges the master oscillator 5 to the frequency ,, ОД, GEN. Rpl ,, Rom "W: - P ° bR C ° 37 is connected to the modulator 6, the latter is disconnected from the audio frequency generator 2,

from the first divider 7 and block 18. After passing the fourteenth pulse to the control block 34, the readiness signal of the proposed device for measurements, which is carried out using block 9, is turned on.

Claims (2)

1.A device for automatically measuring the relative power level of the spurious radiation of a radio transmitter, comprising a switch, the first input of which is the output of the radio transmitter, an audio frequency generator, serially connected master oscillator and a modulator, the second input of which is connected to the output of the audio frequency generator, the first signal divider, sequentially connected to the signal level control unit, the first input of which is connected to the first output of the first signal divider, phase shifter, block to compensation, the second signal divider and the comparison unit, a band-pass filter, a noise generator connected in series, an attenuator and a third signal divider, the first and second outputs and the second input of which are connected respectively to the second input of the compensation unit, the second input of the comparison unit and the output of the band-pass filter, the second output The attenuator is connected to the second input of the second signal divider, the tunable filter and amplitude and phase control unit connected in series, the first and second outputs of which are connected to But to the second inputs of the signal level adjustment unit and the phase shifter, characterized in that. that, in order to increase the points And while reducing the measurement time, a signal frequency converter, two concentrated selection filters, a control unit, a clock generator, a pulse counter, a memory unit, four decoders, four reference oscillators, a recognition unit operating mode, and the bandpass filter is tunable, the first and second inputs and output of the signal frequency converter are connected respectively to the first output of the switch, to the first output of the modulator and the first input the first signal divider, the second and third inputs and the output of which are connected respectively to the second output of the modulator, the second output of the noise generator and the input of the first concentrated selection filter whose output is connected to the input of the bandpass filter, the first output of the control unit is connected to the input clock generator, the output of which is connected to the first iy input of the pulse counter, the second and third inputs of which are connected respectively to the second output of the tunable filter and the second output of the control unit, the first and The second inputs of which are connected respectively to the output of the comparator and the input of the audio frequency generator, the second output of the second signal divider is connected to the first input of the tunable filter through the second, a concentrated selection filter, the second input of the tunable filter is connected to the output of the first reference generator, the first input of which is connected to the output the first decoder output of the second decoder is connected to; the first input of the second reference generator, the output of which is connected to the control input of the bandpass filter, the output of the third decoder is connected to the first input of the third reference generator, the output of which is connected to the input of the sound frequency generator, the first output of the fourth decoder is connected to the input of the memory block, the second output of the fourth the decoder is connected to the first input of the fourth reference generator whose output is connected to the input of the master oscillator, the first, second j 10 j 20 25 p five 0 five 0 the third, quarterly, fifth, sixth, seventh, eighth, ninth, tenth, eleventh and twelfth outputs of the pulse counter are connected respectively to the first and BTOpONry inputs of the mode recognition module, operation, to the second input of the fourth decoder, to the second input of the third decoder, to the second input of the fourth reference generator, to the second input of the third reference generator, to the control input of the switch, to the second input of the second splitter, to the second input of the first decoder, to the second input of the first reference generator, to the second input of the second reference generator and the third input of the modulator, the second output of the switch is connected to the third input of the operating mode recognition unit, the fourth input and the first, second, third and fourth outputs of which are connected respectively to the third output of the modulator and the first inputs of the first, second, the third and fourth decoders, the output of the memory unit is connected to the third input of the fourth reference oscillator. 2. The device according to claim I, characterized in that the operation mode sensing unit consists of a series-connected re-tunable resonator, a detector and a reference voltage generator and a series-connected reference unit and a control voltage driver, the second output of the detector is connected to the first input comparison unit, the second input and the second output of which are connected respectively to the first output and the second input of the reference voltage generator, the second output of which is connected to the first input of the tunable The resonator, the third input of the reference voltage generator is the first input of the operating mode recognition unit, the second, third and fourth inputs and the first, second, the third and fourth outputs of which are the second input of the control voltage generator, the second and third inputs tunable resonator; and the first, second, third, and fourth outputs of the control voltage driver.