Check out RF Micro Devices DKFC5072A development board. This is a mixer and 
synthesizer that is programmable via a USB cable. It's rated up to 6 GHz and 
could form the basis of a universal transverter, just add appropriate filters 
and amps. I have used the older version up to 2.5 GHz and they work pretty 
good. The development board is $210.00. 

- Howie AB2S
                                          
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