Printed circuit Board controller of the second version. Reduced size, there is a possibility of installation of the connector 30 or 40 pin. for loop display.
SDR radio path collected by the scheme synthesizer AD9958-AD9959. As the mixer used FST3253 chip gain at INA163. Of the radio input has separate transmit and receive output. On board there is a switchable attenuator from 0 to 40 dB in 2 dB steps. The radio link to the Office for the SPI bus. The link scheme
PCB bandpass filter (BPF) with an output power amplifier pre-amplifier in the OPA2674. There UHF transistor 2SC3357. During transmission through the receiving channel is switched. Scheme bandpass filters