Comtech UT4505 C-Band Up Converter is a used 70 MHz to C-Band – We have several of these tested and guaranteed to be in perfect condition.
I have stolen some text from their datasheet, that is fully shown on the downloads tab.
The Comtech EFData (CEFD) UT-4505/X Up Converter is the ultimate in high performance and cost effective C-Band frequency conversion. The UT-4505/X can be used for SCPC, DAMA, and TDMA, as well as full transponder HDTV and analog TV. Spectral purity and stability characteristics fully meet or exceed the requirements of all domestic, international, and regional commercial satellite networks.
The UT-4505/X has +17 dBm minimum output level at the 1 dB compression point and 35 dB of gain as a standard. These standard capabilities permits longer cable runs to the high power amplifier or compensates for elaborate combining networks without adding expensive options such as external line amplifiers.
LOW PHASE NOISE
The phase noise performance of the UT-4505/X exceeds the Intelsat phase noise mask for IBS and IDR services by more than 9 dB. This allows phase dependent demodulators to perform better. The close-in phase noise is very low, making the converter ideal for low bit rate digital circuits such as those used in DAMA hub earth stations.