HI,
Just a question concerning the relationship between FI (IF Offset), IS (IF shift) and BW bandwidth and their use with pan adapters.
If I connect a fixed tune SDR with no offset to the IF output of the K3 then I can get the IF offset of the signal using the FI command. Thus if I look at a spectrum of say +- 96 kHz, the centre point will represent the frequency that the radio is tuned at, and the carrier of the actual signal as shown on the spectrum will be offset from this frequency by the value of FI, correct?
Ok, so lets say the FI offset is 6500, the IS Shift is 1500 and the bandwidth is 3000 then I should see a audio passband starting at 6500 , and finishing at 3500 in the case of USB. If I change the IS Shift to 2000, then the passband starts at 6000, and finishes at 3000.
So in general for USB signals you could write an equation LowFreqPassbandStart = FI -IS -0.5*BW and the HighFreqPassbandend = FI - IS +0.5*BW (assuming of course that the FI offset is negative)
Does this make sense?
I think i’ve had my head in to much code lately and tried a few hardware pan adapters and started losing track of things, lol
Just need a reality check.
Thanks, Tom
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