can some one help me design an oscillator of frequency 105.2mhz as i cud not find a crystal of that frequency..

 

You need to give more details - but to answer your question 'as it is', you use a lower frequency crystal and multiplier stages - or you could use a PLL and divider stages from a VCO.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

i need to mix an i/p frequency of 105.4mhz with the 105.2mhz signal(help needed here in design)to get an o/p of 200khz to be feed as an i/p to ic 565

Nigel cud u give me the detail of the pll and divider stages..

 

Assuming you're still wanting to built an FM radio?, this ISN'T the way to do it! - as I explained before, 200KHz is FAR too low. I suggest again you read up on how radios work, pay special attention to bandwidth, selectivity, and
image rejection.

There is LOT'S of PLL information on the net though, have a look here for one example
http://www.radio-electronics.com/inf...nth_basics.php

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

Here is a typical PLL chip. Read the data sheet and all application notes to understand how to use it:

http://www.analog.com/en/prod/0,,770...4002%2C00.html

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RadioRon