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Re: [wsjt-devel] Enforcing WSJT-X split mode
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From: Lance C. W. <w7...@bi...> - 2025-10-13 19:39:55
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Hi John, It IS important not to overdrive your audio stage, but that is not the biggest issue. The problem arises if the audio signals actually transmitted by the computer are under 1500 Hz...in that case, the audio harmonics can be passed through the filter in the transmitter and broadcast all across the spectrum. Before he passed away, W9MDB explained this on his website: https://www.dropbox.com/scl/fi/avq8nt3higd3evutjssv4/FT8Noise8.pdf?rlkey=xgfxw0bmtdik23h1psu7khz38&e=1&dl=0 GL and VY 73, Lance On 10/13/2025 18:50:14, John Kludt via wsjt-devel wrote: > Guys, > > I thought this all started with an observation that some people hit it way too hard > and generate unwanted harmonics. I have always thought the "cure" for that was to > turn down the audio feed. It is not clear to me how using rig split or Fake It > solves that problem. I always use Fake it - have for literally years. I thought > either method ,Rig Split or Fake It, was about keeping your signal more or less in > the center of the bandpass. I do recall advice somewhere to run higher in the > bandpass rather than lower in the bandpass to move unwanted signals out of the > bandpass - is that why you all are discussing Fake It versus Rig Split? Isn't the > better answer to make sure you have a clean signal and in some cases maybe turn > down the power just a little bit? > > Just curious what I am missing. > > John K7SYS > > On Sun, Oct 12, 2025 at 11:57 PM Reino Talarmo via wsjt-devel > <wsj...@li...> wrote: > > Hi Andy, > > Your statement ‘Testing fake-it requires a transmission but rig split does > not.’ without additional information makes no sense to me. Do you mean how an > operator can see that he is transmitting at correct radio frequency? Most > radios indicate the used VFO frequency, when commanded for transmission. In the > fake-it operation the RX VFO (A) frequency changes and in the rig the > transmission uses the TX VFO (B). For an indication both require a rig > transmission activation. > > If the Tune button is used for the activation, then there is output power in > both cases. If the Test Cat button or the Test PTT button is used, then no > audio will be transmitted, and no RF output will be sent. (If PTT method VOX is > used, then the Test PTT don’t work and only the Tune button can be used.) > > The change of the audio frequency is not presented to the user. > > It would be much easier to help in the rig split operation, if at least you > tell us the rig type and how CAT control is arranged. > > 73, Reino OH3mA > > *From:*Andy Durbin via wsjt-devel <wsj...@li...> > *Sent:* Monday, October 13, 2025 12:24 AM > *To:* WSJT software development <wsj...@li...> > *Cc:* Andy Durbin <a.d...@ms...> > *Subject:* Re: [wsjt-devel] Enforcing WSJT-X split mode > > "I provided a signal report with screen shots to one offending station and he > improved his signal with audio drive adjustment. He stated he was using rig > split." > > Correction - He stated he was using fake-it. Testing fake-it requires a > transmission but rig split does not. > > Andy, k3wyc > > _______________________________________________ > wsjt-devel mailing list > wsj...@li... > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > > > > _______________________________________________ > wsjt-devel mailing list > wsj...@li... > https://lists.sourceforge.net/lists/listinfo/wsjt-devel -- Lance Collister, W7GJ(ex WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX, 3D2LR, 5W0GJ, E6M, TX5K, KH8/W7GJ, V6M, T8GJ, VK9CGJ, VK9XGJ, C21GJ, CP1GJ, S79GJ, FO/W7GJ, TX7MB, TO7GJ, 3B9GJ, ZD9GJ, H40GJ) P.O. Box 73 Frenchtown, MT 59834-0073 USA TEL: (406) 626-5728 QTH: DN27ub URL: http://www.bigskyspaces.com/w7gj Skype: lanceW7GJ 2m DXCC #11 - 6m DXCC #815 - FFMA #7 Interested in 6m EME? Ask me about subscribing to the new Magic Band EME email group, or just fill in the request box at the bottom of my web page (above)! |
