COBRAS/SAMBA carries a Low Frequency Instrument (LFI) which is envisaged as coherent receivers using HEMT amplifiers. More information on the recievers can be found on the hardware information page. A block diagram of the LFI is shown in the next figure and summarized in the following table.
A major decision for the LFI performance is the question of active versus passive cooling. The instrument characteristics for passive cooling are well described in the Phase A Study "Red Book". Thus we show here more information on the active cooling appr