Horizontal deflection TS-257

The MRK-1 radio-frequency television channel includes controls for line and frame sweeps and metricwaveband (I to II to III) and decimetric-waveband (IV to V) selectors. The metricwave band selector consists of separate r-f amplifiers and heterodynes for each of the three frequency bands, in addition to a high-pass ladder filter, a mixer, an intermediate-frequency stage, and an automatic gain control common for all. The decimetric-waveband selector (470-790 MHz) is coupled on its output side through a matching resistor and a switching diode to the mixer of the metric-waveband selector. Its input stage is a fixed high-pass filter and has a capacitor which partially compensates the input inductance of the r-f amplifier transistors. An i-f image filter on surface acoustic waves with an interdigital transducer and a K174UR5 microcircuit, a two-stage transistor amplifier which compensates the attenuation of i-f signals in the filter, automatic frequency trim for the heterodynes, synchronous detectors for video signals, an amplifier-limiter and a phase detector for audio signals from the SAW filter in the sound track are included.