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Fldigi 4.2.06.26 on Linux (LMDE 6)
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Hi again...
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Pulled and built 4.2.06.26 without issue a few days ago, and everything was good.? A major OS update appeared "took" without issue, and Fldigi still behaved as one would expect, even after restarts and so on.? Great!
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Fired it all up this morning (March 28th, 10AM UK) and all good.
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Had to shutdown the PC some time later to move some other hardware about, much easier if I can move the PC and monitors out of the way.? Put it all back and started it all again.? No issue...
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But, after a while running in the background (while I did some email's in another UI desktop) while it was running PSK31 mode (that WAS showing the AFC control as able to be used, but NOT active.)?? On restoring Fldigi to "the front" (AKA "in focus") and active use, that AFC button is again greyed out.? But, fiddling with the radio and a steady strong signal, the AFC is ACTIVE, but not working correctly, even though the greyed out button shows it as INACTIVE.?? And of course, I can't control it.?? Restarting Fldigi, the PC etc, that AFC button is permanently greyed out, but the underlying AFC functionality is still ACTIVE!..
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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.
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AFC (AFC) control
When this button is pressed, an indicator on the button turns yellow, and the program will automatically retune to drifting signals. When the button is again pressed, AFC is off, and the tuning will stay where you leave it. No mention of which modes it applies to, or not...
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(* Valid or not, when the control is greyed out, and the LED also shows grey) it seems to be active for all modes, if you watch it's behavior on a busy waterfall, especially a weak signal with stronger ones nearby/encroaching.)
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So, what on earth is going on?
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Still confused of Central UK.
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73
??? Dave G0WBX.
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Replying to my own posts ...? Not ideal but...
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I crafted the last mail in the groups.io web page, while Fldigi was running in the background, with the "errant" disabled AFC control with "unlit" LED, but AFC observed to be active.
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After I sent the last mail, and shutdown the browser (Firefox 136.0.2 64 bit) and restored Fldigi to front-of-house....
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The AFC button was NOT greyed out any more, AND it was showing AFC active!? I.e.? The? "Green LED" is lit.
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This is beyond my ability to debug.?? But I can follow instructions to gather information if so desired.
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73.
??? Dave G0WBX.
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开云体育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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开云体育Thanks Bob for the AFC info hints, all agreed with here. This strange behaviour I only noticed in the later alpha releases for 4.2.06, I don’t recall experiencing any such weirdness before. Thanks again and 73. Dave G0WBX
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