Down/up converters from 2.4ghz from/to 400/500 mhz

Hello everyone,
I'm looking to some cheap way to do a conversion from 2.4 ghz to 400/500mhz, for the down conversion part, I've found some cheap MMDS aerial downconverters on ebay, but I'm missing the up conversion part, any hint ?

Regards,
Giacomo.

If you want to do an up and a down conversion, you need a transverter.

http://www.minikits.com.au/13cm-Transverter

Thank you for your suggestion, looks like the perfect solution for me, I also searched for transverters but found nothing, the dealer you linked me has a lot of useful things, if you know any other please PM me :)

Regards,
Giacomo.