A new super budget HF upconverter has appeared over on cosycave.co.uk, a UK based trading site. It is currently priced at £9.99. The budget HF upconverter uses a 50 MHz oscillator and an NE602AN double balanced mixer and oscillator integrated circuit. It is only suitable for use on the R820T and is incompatible with the E4000.
This circuit appears to have no preselection or filtering circuits.