S-band down comverter (mixer)

I need design data on a S-band (3 GHz) to VHF (144 MHz) down converter to be use in aweather satellite receiver for pictures from geo-stationary satellites
Can anybody help me?

These transverters (just use the receive side) are for 2.3GHz to 144MHz, but will give you an idea how can be realized.

http://www2.arrl.org/tis/info/pdf/2304xv.pdf
http://www.kuhne-electronic.de/userf...4ghz/23g2e.pdf