ILIAN KUSHEV wrote:
> Does anyone know aof a website or some downloadable software for
> designing receivers for band 430-440MHZ?

Sounds like hard work to me.
Why not start off with a UHF TV tuner?

I thought of using the Philips FQ916 as a general purpose
front end for receiving almost everything in the UHF/VHF
bands. TV audio/video of course, but with secondary circuitry
you might pick out amateur radio, weather satellites,
pagers, packet radio...?

Neatly avoids all that black magic RF design/construction,
and dirt cheap too!