Varactor-tuned oscillator

fourblackcats · 2006-03-18T04:33:01+00:00

Hi Folks,I'm trying to stretch the tuning range of a varacter-tuned oscillator. I'dlike it to cover the standard 88 - 108 MHz band, but I'm only getting from88 to 96. The varactor is NTE613, and the spec sheet says that the C2/C30ratio is about 2.9. I think the frequency ratio is the square root of that,so that would be about 1.7. That's a pretty wide tuning ratio. I'm onlygetting about a 1.1 ratio, but I only need about 1.3. That doesn't seem likeasking too much does it? I'm operating the varacter from 0 to 26 voltsregulated. It tunes nicely, but I don't know how to extend the range. Anysuggestions would be greatly appreciated.Allen*** Free account sponsored by ****** Encrypt your Internet usage with a free VPN account from ***