Reply To: RSPdx block diagram

#1735
G4ABQ
Admin

Hi again rlkeck,

this additional info may help…

An important thing to know is that the RSPs work in gain reduction rather than gain. There are two types of gain reduction – IFGR (IF gain reduction) and RFGR (RF gain reduction). I refer you to section 5 of the API document – this will show you the RFGR range for each RSP. You will see that the range varies between each RSP and for different LO frequency ranges. The RFGR range is a value from 0 (min GR, max gain) to N (max GR, min gain). The tables show you the value in dB for each RFGR value. The RFGR is a manually programmed range, it is not affected by AGC.

For each step of the RFGR range, you can also adjust the IFGR range from 20 (min GR, max gain) to 59 (max GR, min gain). The IFGR value is in dB and can either be programmed manually or controlled by the IFAGC loop. In most cases, you can set the RFGR and then allow the IFGR value to auto adjust via the IFAGC.