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Originally Posted by Zener_Diode Thanks for helping....
I choose mc3362.
I have some questions:
1. at page 4, there is LC connected to pins 21,22. the note saied it should be 10.7Mhz above or below the RF in. The LC tuned to 6.4MHZ below, why 6.4 and not 10.7?????
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I don't see anything about 6.4MHz?, the first IF is 10.7MHz (standard for VHF radio) - so the first local oscillator needs to be either 10.7MHz above, or below, the incoming signal. The LC on pins 21/22 are the tuning components for the first local oscillator.
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2. The varicap at pin 23, what dela F LO I can get with it????
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It will depend on the LC circuit you use, and the range of the varactor diode.
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3. How can I use PLL wuth this chip?
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It's got a control voltage input, and a buffered oscillator, that's all you need to add a PLL tuning system - it's designed to be used with one.
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does someone can tell me a number of a RF amp chip???
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Generally you would probably use a discrete RF amp, tuned input and output would be a good idea as well for any sort of decent receiver.
7th January 2005, 04:51 PM
Linear Mode
