Early morning 17m FT8 before work.

Slow FT8, SuperFox Trials, Wake Island is Sinking(?), and a New General

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FT8 Slowdown: Blame the Solar Storms

This past week or so has been odd on the airways. The previous week’s FT8 sessions were ridiculously busy, netting thousands of contacts. This past week, not so much. The slow down was mostly due in part to unfavorable radio conditions caused by solar activity wreaking havoc on the bands. Being new(er) to FT8, I had hoped the magic of WSJT-X’s weak signal decoding would overcome the solar storm chaos. It seems my expectations were too high.

Don’t get me wrong, I still made many contacts, just not at the volume I had seen the week prior. This week I painfully watched the software make many more repeat attempts to callers who apparently were unable to decode my reports. The slow-going pace of this mode made my overactive personality cringe. Watching those minute-long QSOs stretch into even longer exchanges was… painful. To see the software timeout on too many callsigns after four attempts to hail them was disappointing.

That’s where I’m curious how other people who work piles pick which people to respond to first. Some stations come booming in (>+20 dB), yet seem deaf to my replies. Is their station antenna pointing the wrong way? Is there interference on their end?  Is my signal getting interfered with? I’m not sure. Then sometimes I have stations that seem slightly degraded (-10 or lower signal level) who reply the first time and report a strong signal level from my station. I know the signal level reports do not matter in regards to whether the contact is valid or not, just the slow going this week allowed me time to ponder these non-life-altering questions.

Testing the Waters with SuperFox

Looking forward to more optimal conditions in the weeks ahead I decided to do something super duper. I requested and was granted a SuperFox key for use with WSJT-X. Be on the lookout on my Upcoming Activity page for dates, times and specific frequencies I will be testing and using that on. It was recommended to me to start with SuperFox and change to Fox-Hound mode once I get through the “louder” portion of the pile up. While SuperFox looks super from the videos I have seen, it is useful up to a point. It seems FH is superior for digging out those much lower signal levels. 

Wake Island is Sinking?

Shame on me for such scandalous insinuation. It is, but not physically, well I hope not any time soon. What I am referring to is Wake’s ranking on the “Most Wanted DX List”. I wish I had checked where it was when I arrived back in November, 2024, but I did recently notice it drop down two spots from #28 to #30. Let’s keep that ball rolling if you please. There are close to 13,000 QSOs in my /KH9 logbook. I hope to double that by year’s end and I know by adding FT8 to the arsenal that makes it a realistic, if not low, goal. My ultimate goal would is to just be able to call CQ and have a normal conversation with people. That is my motivation for sinking Wake Island on the most wanted list. With time, effort, and your persistence and patience we will get there.

A New General in the Ranks?

Lastly, my colleague here, Richard (KR4CDI), has been diligently studying to upgrade to a General class license. Knowing Richard I expect he will easily pass that test and will open up all those bands for his enjoyment. It has been fun to watch the HF magic secure its grasp on him while he’s been on 10m meeting people from around the world. Bring on the pileups, but go a little easy on him. At least easy on him at first…

73,

Allen

PS, check out this photo I put together. I am by no means a graphic artist but I love photograph and dabbling with things creatively. This was my attempt to work with ‘masking’ letters to allow other pictures through on the image. Wake Island’s 8″ gun in the surf on Peale Island is the main subject.

14 responses to “Slow FT8, SuperFox Trials, Wake Island is Sinking(?), and a New General”

  1. Clarke K1JX Avatar
    Clarke K1JX

    Allen,

    Here’s something to consider. When you are opening as a Fox, the temptation is to use as many transmit steams as possible. That’s the point, right? Lots of people are calling you, many of them loud.

    But, think about this. When you spread your transmit power over multiple steams, the power in each one goes down proportionately to the numbers of streams. So, if you use two streams, your signal drops by 6dB. (20 * log (number of streams) because the voltage to each stream goes down.) With five steams, they means each stream goes down by 14 dB. You can imagine what that does to your signal. Of course, the callers don’t go down at all.

    Now, in Super Fox mode, the situation is a little different. There’s only one much wider stream that carries more digital data. Although there’s some good things about that, it also means that the threshold for decoding a Super Fox signal is higher. Usually, a single stream at -23 to -24 dB is decode-able. But, the minimum SNR for decoding a Super Fox stream is about -16 dB. Physics…

    So, a number of expeditions tend to only use two streams, or even one, unless the band is really good. In the end, that gives greater throughput because there’s fewer repeats

    I’m probably telling you something you already know.

    As for whom to call first, well, although I’ve never been on a DXpedition that used FT8, other guys I know have and everyone had a different approach. Some large DXpeditions have hand curated each contact – the operator selected each station to put in the queue. That is probably the ideal approach in many ways because a human recognizes when a Hound is calling over a tough propagation path that might last five minutes. But, it takes real concentration. Others set the software to respond to the weakest callers first. Others to the strongest. Or, just the first decoded. So, personal taste.

    Personally, I think you should use the approach that lets me work you first. :8^)

    Clarke K1JX

  2. Juergen Avatar
    Juergen

    Hi Allen,
    thank you for your attempt to try SF. If your (and not the other station’s …) signal is good enough to be copied by your callers when you use two streams then SF will give you this higher rate compared to standard F/H. Your strategy to use SF and pick the loudest stations first and switch to standard F/H with one stream later is also ok as I see it. There will be always some crocodiles which have a strong signal but cannot hear you, and it will also happen that the frequency of a caller is suddenly occupied by another stronger station (some don’t care, some cannot see the other one calling you), but over all your results will be better. If it would be clear for everybody (not only those reading this blog) that you use F/H then the frequency below 1000 Hz would be free for callers responding to your call with their R-xx as WSJT-X pulls those stations below 1000 Hz where there is no interference. This is one of the huge advantages of WSJT-X compared to some other programs because it gives a much better chance for little pistols to complete a contact successfully.

    I hope that conditions to EU will be good enough tomorrow to see you signal on 15m in FT8 …

    73 and continue to enjoy FT8

    Juergen, DL8LE

  3. Wolfgang Avatar

    Hello Allen,
    so the next FT8 session will be done with Super Fox?

    Did you allready uploaded the QSOs from the last 17m FT8 session to LOTW?

    73 de HB9RYZ
    Wolfgang

  4. Brian Avatar
    Brian

    Hello Allen .
    When you have problems like that .. ( no one hear you ) . go down to maximum 2 carriers, or even one carrier .
    I know it takes longer , but it completes faster .
    I often hear DX when they are on few carriers , but as soon as the power is spread out on more , they dissappear .
    hope to work you some day .
    vy 73 de OZ1CTZ. Brian …

    1. KH7AL Avatar
      KH7AL

      Hi Brian,
      I agree with switching to 2 carriers. Only when signals are strong and the band conditions were optimal do I go to 3. 4 is a real stretch I save for working my neighbors in JA. I hope to catch you on the air.
      73,
      Allen

  5. Carlo Avatar
    Carlo

    Hi Allen,
    thanks so much for these reports of yours.
    It is truly a pleasure to read your comments/considerations.
    Your curiosity is my curiosity and perhaps that of many others; certainly they are not questions that change life but, step by step, they allow us to understand and satisfy this passion of ours.
    I do not think that kh9 will “sink” hi in the MW list.
    I hope to connect you soon also in FT8.
    I wish you the best with best wishes to Richard for the test.
    73
    Carlo IK6HSM
    google traslator

  6. Alex DG1PM Avatar
    Alex DG1PM

    Hallo Allen, i would NOT recommend SF Mode in your position, as is more susceptible to interference and more sensitive to time deviations IMO.
    Most expeditions use MSHV or F/H, for a good reason.
    Best 73 and hope to catch you soon
    Alex DG1PM

  7. Bernard PB7Z Avatar
    Bernard PB7Z

    Hi Allen,
    Thanks first for your activity from Wake Island.
    Happy you do FT8 , what will give me and many others a bigger change for a qso and ATNO!!

    Superfox is also better from your side.
    If you use more streams in F/H , your power will be divided by the streams.
    So 100W with 3 streams would be 3 times 33W , if i have it correct.
    Superfox gives you 100W on your signal , even if you work more stations at once.
    Also gives SuperFox you the whole bandwith for the callers as well!!

    Hope to work you soon.
    Europe has a small window to Wake Isl , hope that the JA’s give EU a change as well.
    Mostly what i see are JA’s all over the band.

    73’s
    Bernard PB7Z

  8. Andrea IK0PUL Avatar
    Andrea IK0PUL

    Ciao Allen,

    most of the DX peditions uses MSHV ( insted of F/H by JTDX ) because callers can also call on frequencies below 1000 Hz, so pileup is spread over a wider band width; someone uses a re-compiled/modified MSHV allowing decoding from 3000 to 3500 Hz too. Please ingnore Super Fox, for the reason well explained by Clarke K1JX above; Super Fox main added value ( from my point of view ) is the ability to “sign” your signal, and callers can distinguish dx pedition and pirate stations ( however this signing mechanism seems to be weak ).

    We are going to have an event in our local OM club to see how experienced dxpeditioners set the parameters in MSHV to manage the queue and get the higher possible QSO rate. Feel invited in Italy to join 🙂

    Regarding propagation, FT8 is great to study and touch the status of the propagation and the open paths: just stay decoding for a wile on the standard FT8 frequency to listen the decoded stations. IT would give you an idea. FT8 is also greate to compare TX antennas, in conjunction with pskreporter ( ps. I see your jtdx has “post decoded stations to pskreport” feature enabled, and I saw I was -8 in your side minutes before we had QSO ! ).

    As last, please share more details about the antennas you use each session, I’m courious about your work on antenna… I don’t know if you are using verticals, heaxbeam, or dipoles ( in this case how the main lobes are oriented ).

    Enjoy and a BIG thanks for putting Wake in the air… no way for MIDWAY and/or JOHNSTON ?! :-)))

    Ciao

    Andrea

  9. Juergen Avatar
    Juergen

    Hi Allen,
    another comment when I look at the very high retry rate on your site at the moment even though your signals are pretty stable with about -11/-14 on two streams: If stations don’t use F/H but just the standard mode they will not respond to your ‘call KH7AL -05’ because they have called you with KH7AL/KH9 before. WSJT-X is considering this in F/H mode.

    73
    Juergen, DL8LE

  10. Darrell G0HVQ Avatar
    Darrell G0HVQ

    Hi Allen

    I think I know the reason for the multiple repeats on FT8 as I was watching your 15m pile-up today.

    Many people think you are using F/H so are QSYing to your TX freq when you call them, as per the software rules, but the trouble is that many other people are also calling on your TX freq from the start creating QRM. F/H relies on everyone following the rules and keeping the DX’s call freqs clear, if some are not following this, it is creates chaos as the DX cannot decode the callers when they QSY down. Indeed, most DX spots on the cluster say you are using F/H.

    But when I watched the successful QSOs, they are not QSYing down but staying on their original TX freq. So I did the same and got you, many thanks for the QSO. It may be worth saying on your webpage not to use F/H. SuperFox will be much better as there cannot be any confusion as staions running normal FT8 cannot decode it. BTW you were a very big signal here in the UK today on my Hexbeam, was surprised how strong.

    73
    Darrell G0HVQ

  11. Joe CT7APD Avatar
    Joe CT7APD

    Hi dear Allen, my god, I hope I can copy you soon and do at least one QSO with KH9 to have an ATNO on my DXCC list. I have faith that with SF mode I’ll have more opportunities. I’m looking forward to your upcoming activities.
    — 31 May ~ 07:00 – 10:00, 17m FT8.
    — 01 Jun ~ 07:00 – 10:00, 30m CW.
    or any mode , any band.
    73 de Joe CT7APD

  12. Joop PA0JMV Avatar

    Hello Allen,
    On 24 may I decoded you many times on 21.097, but no way to break the JA tsunami.
    I have studied the picture of ur waterfall display and it seems your rig is not decoding above 2000/2500 Hz…?
    Also the audio passband looks not flat. Maybe some settings in ur receiver? Receiver bandwidth of 4000 Hz works usually best and a smaller bandwidth does not improve the FT8 decodes (like u do in CW when sigs are vy weak)
    Hope to get an ATNO from you, GL, 73,
    Joop PA0JMV

    1. KH7AL Avatar
      KH7AL

      Hello Joop,
      Yes, my receiver filter has been opened to the max, 3.6KHz.
      73,
      Allen

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