This was a testbench and prototype for a reference oscillator designed for use in the extractor within the SSR (Secondary Surveillance Radar). This oscillator was the main reference generator for the sample and hold circuit (ADC converter). Baseband (video) signal from the reciever in the SSR is sampled and then fetched to a PC based module for data extraction and HDLC packet generation in ASTERIX format. So, the oscillator must be very stable and sample frequency must be constant, sharply corresponding to the following: The period of the signal must be equal to 1/16 of 1,45uS and the duty cycle must be 50%. This is infinite fraction, so the coresponding frequency is arround 11.0448276...MHz. The task was to design stable generator with corresponding prescalers for this frequency synthesis, to use it in the military equipment. Some screenshots ot the results are shown down...

For more detailed photos, please click on the pictures!