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FLDIGI 4.2.06 / RumLogNG v 5.19.1/OSX / MacOS 15.3

 

Hello,
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I like to use FLDigi for RTTY and I have been working the RITTY contest this weekend. I am using my Elecraft K4 to send RTTY since its build it and works well. I noticed FLDigi is not decoding RTTY when I am in FSK mode to be able to send RTTY. ?If I move to DATA mode it decodes. ?I opened the filter on the FSK to get more of the siglanl into FLDigi but no decode. ?Im not sure if it’s the mode or the filter but if any can let me know I would like FLDigi to decode RTTY in FSK mode.?
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Tim?
KM4ESU
 

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Howdy Tim,
Ya, as far as I know FLdigi only decodes the mode that it is operating on.
The others appear on the waterfall but are not decoded.
Doubtless many others on this group can explain things better.
73 de John K7JHM?


On Feb 8, 2025, at 6:46 PM, Tim Huffaker, KM4ESU via <thuffaker@...> wrote:

Hello,
?
I like to use FLDigi for RTTY and I have been working the RITTY contest this weekend. I am using my Elecraft K4 to send RTTY since its build it and works well. I noticed FLDigi is not decoding RTTY when I am in FSK mode to be able to send RTTY. ?If I move to DATA mode it decodes. ?I opened the filter on the FSK to get more of the siglanl into FLDigi but no decode. ?Im not sure if it’s the mode or the filter but if any can let me know I would like FLDigi to decode RTTY in FSK mode.?
?
Tim?
KM4ESU

John McCurdy

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John,
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Yes it was one of the first things I checked. ?On Data mode it decoded but moving to FSK it stopped. ?

Tim
 

Usually what happens when people try to do this, is that there is no one transmitting in the new passband when switching to FSK mode. And if there is, the FLDigi 'red lines' tuning indicator is not lined up with the signal being received. Here are a couple of screen shots when using the DATA-U mode to receive, and then the FSK mode to receive. Notice that I moved the FLDigi tuning lines up to 2100-2200 Hz which is where the audio is coming through (actually 2170 according to the digital display just below the waterfall).
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Dave,
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On data mode for the RADIO with the same settings on FLDigi. ?You can see data being decoded
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When I switch to FSK, the decode stops the same setting on FLDigi. ?
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Hi Tim,
In your second screen shot I do not see any signal in the passband, but instead, I see a LOT of noise. Earlier you said
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> ?I opened the filter on the FSK to get more of the siglanl into FLDigi
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I am not sure how you did this, but from this shot, there is no signal there - only noise. With no signal to decode, that is, the pair of tracks like we see in your first shot, those centered at 700 Hz, 1500 Hz, and 2500 Hz (approx) there is nothing for FLDigi to do.
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Take another look at my earlier post with the two screenshots of the waterfall. You can see that there are signals in both pictures, with the biggest difference being the width of the passband, and because of that, more signals to decode in that first one.
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I think this is what you will need to do, and with your radio (not fldigi) so that there is a signal to decode. Once you have a RTTY signal transmitting so that he is in your receive passband, and it shows up in the fldigi waterfall, then fldigi will be able to lock onto it and decode it.
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Thanks for the full screen shots - it is very helpful to try to figure things out and to understand what is going on there. "More information is better"
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73,
Dave
 

Hi Dave,
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I am sorry I captured the wrong picture on the FSK one I kept adjusting the S/N number from dark red to light yellow and could only decode noise. ?I did widened the filter and that did not change much. ?The immediate ?time I moved to Data it decoded the RTTY. ?Now in FSK my radio could decoded the RTTY but FlDigi could not. ?
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What else can I test to get this worked out. ?
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Tim?
 

Tim, maybe I am not understanding the issue here. The very first thing you need to do is to find an RTTY signal and make it visible in your fldigi waterfall / passband. And you should be hearing it through your speaker as well.
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If you cannot see the RTTY signal on the fldigi waterfall, then you will not decode anything.
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I'll refer you again to the two screen shots from a couple days ago, where I posted one in "DATA" mode and one in "FSK" mode. The other guy's signal is visible with two yellow stripes with a blue background.
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I am also a little confused about what fldigi is showing for your system, being in LSB mode and a 50 Hz bandwidth setting. My biggest convern here is that if the radio is actually receiving LSB mode then it might be necessary to "invert" fldigi decoding.... but you said that you are decoding fine in the DATA mode, so as I said, it is confusing.
 

Dave,
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This weekend, I did not see any RTTY, so I thought I would try CW decode. ?I see the same issue of FLDigi not decoding. ?You can decode by just looking at the CW coming through. ?I am not sure, but I do have plenty of signals coming in, so what would stop a decode?
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1. open the bandwidth?on the transceiver.? Narrow BW is good for your ears, not necessarily good for machine decode.
2. lower the digital squelch (right most control next to waterfall).

David

On Sat, Feb 15, 2025 at 9:58?AM Tim Huffaker, KM4ESU via <thuffaker=[email protected]> wrote:

Dave,
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This weekend, I did not see any RTTY, so I thought I would try CW decode.? I see the same issue of FLDigi not decoding.? You can decode by just looking at the CW coming through.? I am not sure, but I do have plenty of signals coming in, so what would stop a decode?
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