[K3] ALC and JTDX
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I recently decided to try JTDX (v 1.7.0), a derivative of the popular WSJT-X software by Joe Taylor. I am using a K3 and an Asus u7 sound card (Windows 7). However, I have run into a snag with respect to ALC.
When I run WSJT-X, everything works exactly as expected. During transmission I easily obtain four solid ALC bars (with the fifth flickering). The same settings do not work for JTDX. In fact, I am not able to find any settings (using the sound card control panel, K3 mic gain, or JTDX pwr slider) that provide four stable ALC bars. At many settings the ALC indicator pulses rapidly from 0 to a level that depends on the settings I choose. The ALC indicator stabilizes only if I push input levels so that the indicator reads 6 or 7 bars. I have done all of the WSJT trials in test mode — I’m reluctant to send anything to the antenna until I figure out what I’m doing wrong. Questions: Has anyone on the list run JTDX on their K3 and seen this problem? If so, were you able to overcome it? What is happening to make the ALC indicator pulse? Depending on feedback here, I’ll post to the JTDX list next. Thank you, Sam W2SNX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Sam,
I don't know what is going on for certain, but are you using DATA A mode? If not, you should be. It turns off compression and sets the equalization flat. What you are seeing could be the result of using SSB with compression turned on. Secondly, use the LINE IN - there is likely too much gain if you are using the microphone input. Then set the LINE (MIC knob) gain on the K3 to about mid-range (which gives more resolution than with the gain at either end of the scale) and then use the soundcard slider and possibly the application "power" control to obtain the right number of bars on the ALC meter. It is strange that the JTDX application needs different settings than other soundcard data applications. That certainly points to some peculiarity (or error) in the software. 73, Don W3FPR On 4/13/2017 3:13 PM, Samuel Cartinhour wrote: > I recently decided to try JTDX (v 1.7.0), a derivative of the popular WSJT-X software by Joe Taylor. I am using a K3 and an Asus u7 sound card (Windows 7). However, I have run into a snag with respect to ALC. > > When I run WSJT-X, everything works exactly as expected. During transmission I easily obtain four solid ALC bars (with the fifth flickering). > > The same settings do not work for JTDX. In fact, I am not able to find any settings (using the sound card control panel, K3 mic gain, or JTDX pwr slider) that provide four stable ALC bars. At many settings the ALC indicator pulses rapidly from 0 to a level that depends on the settings I choose. The ALC indicator stabilizes only if I push input levels so that the indicator reads 6 or 7 bars. > > I have done all of the WSJT trials in test mode — I’m reluctant to send anything to the antenna until I figure out what I’m doing wrong. > > Questions: > > Has anyone on the list run JTDX on their K3 and seen this problem? If so, were you able to overcome it? > > What is happening to make the ALC indicator pulse? > > Depending on feedback here, I’ll post to the JTDX list next. > > Thank you, > > Sam W2SNX Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Samuel Cartinhour
On Thu,4/13/2017 12:13 PM, Samuel Cartinhour wrote:
> I recently decided to try JTDX (v 1.7.0), a derivative of the popular WSJT-X software by Joe Taylor. Why would you want to do that? WSJT in all of its forms is K1JT's invention, the code is written by a team of programmers under Joe's direction, and is under constant development to improve its performance and incorporate new digital modes optimized for different purposes. The latest released version (fully compiled, ready to run) was released about six months ago, and I'm seeing greatly improved decoding (occasionally as low as -28 dB) and even two decodes on the same tone frequency! In-progress versions can be downloaded from code form, but must be complied by the user. No fun unless you're a computer geek. :) This is what K1JT wrote on the WSJT Developer's email reflector a month or so ago to the JTDX author. Jim K9YC - - - - - - - - While I have your attention, I must remind you of obligations you assumed under the GNU General Public License (GPL) when you copied the source code of WSJT-X, made some changes, and renamed it as "JTDX vXX.X ... by UA3DJY". 1. Compliance with GPL requires that a derivative work (such as JTDX) must be licensed in a compatible manner. Just saying "It is open source software distributed under the GPL v3 license" is not enough. Apparently a significant fraction of JTDX distribution takes place from the web sitehttp://jt65-dx.com/download/wsjtx-ua3djy.html . 2. I see nothing on that web site mentioning any license requirement. 3. I see a JTDX screen shot in which the main window title is given as "WSJT-X v1.7.0-devel JTDX v16.6 ... by UA3DJY." We have never released a program called "WSJT-X v1.7.0-devel", so I would not expect to see such a designation on a derivative work. 4. Describing JTDX as "by UA3DJY" is surely misleading, and a violation of the copyrights on our code. Probably >90% of code in your derivative work was written by someone other than yourself. 6. Finally: if you were truly committed to the Free Open Source Software (FOSS) philosophy, I would expect your development work to be organized in a way so that can give back to, as well as take from, the amateur software development community. I can see no evidence that you are doing this, for example with an open source-code repository. -- 73, Joe, K1JT ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Don Wilhelm
Don: thank you very much for your hints. I am using DATA A and LINE IN.
Yes, it is strange that JTDX behaves differently, especially since it is based largely on the WSJT-X code base. Jim: I was interested in JTDX because of claims I had seen concerning its ability to extract additional decodes under crowded conditions (for JT-65). However, when I posted my questions here, I was unaware of the serious attribution and licensing issues. Maybe these need to be discussed more widely. In any event, thank you for bringing them to my attention. Until the matter is resolved to Joe¹s satisfaction, I will not be using JTDX. I have had excellent performance with WSJT-X v.1.7 (and lots of fun). I may download a compiler and give the experimental versions a try. Sam W2SNX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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