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100MHz RX VCO Frequency??

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sunville

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What is the limitation when changing a RX VCO operating frequency from 145 ~ 160MHz to 108 ~ 123 MHz? I tried to tune the tank circuitry but the frequency cannot go lower than 115MHz at lower frequency and there might be start up issue. Please advice.
 

Sadegh.j

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What happens when you decrease the frequency?
 

sunville

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Not to say what will happen if I decrease the frequency. I actually need and have to make sure the operating frequency starts from 108MHz. or in other word, I need the system to oscillate from 108MHz. But now the system starts to oscillate at 115MHz and not 108MHz. Based on calculation, I should be able to get lower frequency if I increase the tank capacitor but somehow the system has start up issue.
 

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