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The HDM-1 frequency agile demodulator is designed to receive and demodulate all UHF, VHF, and CATV channels to baseband audio, video and multiplex signals. The HDM-1 uses a microprocessor driven PLL synthesized tuning circuit to assure precise tuning and accuracy. The microprocessor controls all functions and provides for easy channel selection using front panel channel up/down buttons and a large LED display.