Low-Noise 420Mhz Atv Receiver/Converter


Posted on Jul 18, 2012    9790

Ll, Ql, L2, and L3 compose an RF amplifier stage that feeds Ml, a doubly balanced mixer. Q4 is a l


Low-Noise 420Mhz Atv Receiver/Converter
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ocal oscillator stage in the 375-MHz range. Signals in the 420- to 450-MHz range from Ql are mixed in Ml and fed through filter L6/L7/C17, where only the 60- to 70-MHz (CH3/CH4) signals pass. The IF signal is passed to Q3, an IF amplifier. The overall gain is 25 dB and the noise figure less than 2 dB.




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