CONTROL SIGNAL GENERATOR OF A NEW GENERATION

Abstract

Control signal generators (SCS) allow for the rapid assessment of the condition of radio receiving equipment during its operation, therefore, much attention is paid to their research and development. Very often, noise generators or generators on Gann diodes with low frequency stability are used as control signal generators. Due to the appearance of available frequency synthesizer chips with a built-in voltage-controlled generator, an attempt has been made to use a frequency synthesizer as a master generator in a control signal generator. The use of a frequency synthesizer chip with sequential loading of control codes led to the need to use a microcontroller. An experimental study of a two-frequency control signal generator has been carried out. The functional scheme of the GCS is presented. A brief description of the element base is given. A twofrequency synthesizer Si4133GT was used as a master generator. As the results of the study are presented: – output signal spectrum; – waveforms of the output signal; – dependence of the output power on the frequency for three instances of the cell; – dependence of the output power on the attenuator control code. The following results have been achieved: – operating frequencies 450 and 1200 MHz; – the output power of each channel is at least 100 MW; – relative instability of the carrier frequency 10-5; – the attenuation range of the step attenuator is not less than 20 dB; – pulse modulation depth of at least 30 dB; – duration range of modulating pulses from 10 to 100 microseconds; – the range of variation of the repetition period from 300 to 1000 microseconds; – it is possible to enter an external control signal. By most parameters, the developed GCS exceeds the parameters of the GCS previously developed at the enterprise. GCS is supposed to be used as part of a multi-channel receiver.