Kind of known/derived knowledge plus some of the manual Dave.
It is pointed out that Thor/Domino being IFK have a wide tuning
margin. It follows then that FSQ/IFKP (also IFK) will have the
same "feature". Olivia/Contestia have an adjustable tuning margin
that can allow decoding somewhat away from the centre. (In real
life though there seems to be some degradation on a low s/n
signal)
OFDM/8PSK HAVE to use RSID (and/or the pilot tone) to centre the
signal before their own and built in far more critical (phase
locked) AFC is employed.
Multicarrier PSK doesn't appear to have a working AFC. RsID and
the ability to lock RX/TX with an offset seems to works well for
that. To me that is the only unanswered AFC question.
MFSK is known to be frequency critical and single carrier PSK
performs similarly better . I tend to use the data scope for that.
I have also noticed far more BPSK31 stations using RsID in the
last few months. RTTY also has an adjustable AFC.
Not much left... I did notice some strange AFC button behaviour
maybe a year ago, but not really using it I wasn't worried. Pretty
sure I reported it (here) at the time.
Cheers Bob VK2YQA
On 29/3/25 00:16, Dave, G?WBX via
groups.io wrote:
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?
Someone made mention of the fact that AFC was not valid* for
all modes.?? Where is that information please?? As I can't see
it in the web help doc's.?? Only this, in Fldigi's built in
help.
?
