I think the general idea is that some signals have no carrier that a PLL could lock onto. The FLL Band-Edge centers a signal using the shape of a specific signal (the matched filter being used).
On Thu, Jan 14, 2021 at 6:55 PM Kristoff <[email protected]> wrote: > Hi all, > > > I have been reading some more on PSK demodulation. > > > One of the PSK signals I can easily pick and and is available 24h/day is > the telemetry signal on QO100. > I found a flowgraph from Daniel Estevez that decodes the QO100 > telemetry, so I started examining how it works. > > In that flowgraph (which for some reason I do not seams to find any > more), the first block in the flow (i.e. right after downconverting and > a AGC) is a "FLL_Band-edge" block. > > > Can somebody explain what exactly this block does? > > I researching this, I found that it seams to shift the received signal > slightly up in frequency (at least, that is what it did in my tests). > > I tried reading the documentation, which kinds-of explain how it does > work, .. but not what it does and why it is there. > Can somebody explain the purpose of a "FLL with band-edge filter" block? > > > > Thx :-) > > 73 > kristoff - ON1ARF > > > >
