Frequency counter of the radio amateur `` 4R-02 ''.
Instruments for adjusting and controlling the PTA.Since the beginning of 1993, the frequency counter of the radio amateur "4R-02" has been produced by the Chelyabinsk UNIRET. The frequency meter is assembled on microcircuits of the KR1044IE1, KR1533 series and is designed to measure the frequencies of low and high frequency signals in two subbands: from 1 to 9999 Hz and from 10 to 9999 kHz. The photograph of the device was sent by Igor Baturin, the city of Ufa.