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FLL Band-Edge
From: |
Kristoff |
Subject: |
FLL Band-Edge |
Date: |
Fri, 15 Jan 2021 00:53:24 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
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
- FLL Band-Edge,
Kristoff <=