Re: [wsjt-devel] Dsec control for WSJT-X
BTW, I should add that such a scheme has the potential for bad side effects if widely adopted (which seems unlikely) and if the error is not zero mean. It probably requires most stations to have accurate clocks. From: Deisher, Michael [mailto:michael.deis...@intel.com] Sent: Monday, May 6, 2019 1:35 PM To: WSJT software development Subject: Re: [wsjt-devel] Dsec control for WSJT-X wsjtx seems to have all the information necessary to “crowdsource” the time interval boundaries. For a portable station without GPS or Internet that could really help. If wsjtx published the dt values via IPC messages then it could be done outside wsjtx in a separate utility (i.e., figure out the mean boundary time and adjust the system clock to track it). Seems like a nice little project. 73, Mike KK7ER ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] Dsec control for WSJT-X
wsjtx seems to have all the information necessary to “crowdsource” the time interval boundaries. For a portable station without GPS or Internet that could really help. If wsjtx published the dt values via IPC messages then it could be done outside wsjtx in a separate utility (i.e., figure out the mean boundary time and adjust the system clock to track it). Seems like a nice little project. 73, Mike KK7ER ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] FT4 gain adjustment
Jim, exactly! -Original Message- From: Jim Brown [mailto:k...@audiosystemsgroup.com] Sent: Friday, April 26, 2019 2:29 PM To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] FT4 gain adjustment On 4/26/2019 1:30 PM, Deisher, Michael wrote: > BTW, in my experience wsjtx does not work half-bad with acoustic > coupling. YES! By that I mean, and I think you mean, the computer mic picking up the sound from the speaker in the radio and, by Windoze accident, feeding that to WSJT-X. So I hope folks will forgive my interchanging of the words > “acoustic” and “audio”. No forgiveness needed -- just trying to keep words straight. It's the retired teacher in me. :) 73, Jim K9YC ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] FT4 gain adjustment
Thanks, Bill. My intuition came from thinking of power as the integral of the magnitude squared of the signal over the time-frequency extent. I reasoned that doubling the bandwidth should double the power, all else being the same. But all else is not the same as you pointed out. BTW, in my experience wsjtx does not work half-bad with acoustic coupling. So I hope folks will forgive my interchanging of the words “acoustic” and “audio”. ☺ --Mike ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] Acoustic vs. Audio Frequency
OK. I used the word incorrectly. Thanks for pointing that out. 73, Mike KK7ER -Original Message- From: Jim Brown [mailto:k...@audiosystemsgroup.com] Sent: Friday, April 26, 2019 11:33 AM To: wsjt-devel@lists.sourceforge.net Subject: [wsjt-devel] Acoustic vs. Audio Frequency On 4/26/2019 11:14 AM, Deisher, Michael wrote: > I realized that just after pressing send. The 90Hz bandwidth (I call > it acoustic bandwidth since it is encoded as a PCM audio signal) You're confusing the vibration of air with an electrical signal at audio frequencies. The word "acoustic" and the science of acoustics apply to the pressure waves in air or some other medium (like water), NOT in an electrical circuit. The signal generated and decoded by WSJT-X, and other software, is an audio frequency signal. It takes a loudspeaker or earphones to convert that electrical signal to pressure waves that we can hear. Humans can hear these pressure waves vibrating at frequencies between about 20 Hz and 20 kHz. 73, Jim K9YC ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] FT4 gain adjustment
Hi Bill, I realized that just after pressing send. The 90Hz bandwidth (I call it acoustic bandwidth since it is encoded as a PCM audio signal) is occupied by a spectrally narrow tone at any given point in time so my concern is not valid. The concern would be valid for other modulation techniques that fully utilize the 90Hz at all times during transmission. Never mind... Thanks and 73, Mike KK7ER -Original Message- From: Bill Somerville [mailto:g4...@classdesign.com] Sent: Friday, April 26, 2019 11:06 AM To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] FT4 gain adjustment On 26/04/2019 18:51, Deisher, Michael wrote: > FT4 acoustic bandwidth is nearly twice that of FT8. Hi Mike, that is not correct. The FT4 signal is one-tone GFSK. At any point in time there is only one tone with constant amplitude. In this respect the difference between FT8 and FT4 is that FT8 uses 8 different frequencies to encode symbols and FT4 uses just 4 different frequencies to encode symbols. I am not sure how "acoustic bandwidth" is relevant, whatever that is. The baseband signal is used to modulate an RF carrier so the resulting signal is not acoustic. 73 Bill G4WJS. ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
[wsjt-devel] FT4 gain adjustment
I asked this question in response to the message on the Facebook group but perhaps that is the wrong venue. FT4 acoustic bandwidth is nearly twice that of FT8. With audio gain unchanged when switching from FT8 to FT4, I would expect power out to almost double (or to saturate, etc.). This seems like a potential for operator error. How will it work? Will wsjtx normalize audio output power for the two modes (so that operators can leave sound card gain unchanged when switching back and forth)? Will wsjtx remember its own gain settings per mode? Thanks! 73, Mike KK7ER ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] Reading SWR from rig
Serving wsjtx with flrig works perfectly with my FT-450D. This was just what I was looking for. SWR is displayed during transmit. Thanks again! 73, Mike KK7ER From: Deisher, Michael [mailto:michael.deis...@intel.com] Sent: Friday, March 8, 2019 7:52 AM To: WSJT software development Subject: Re: [wsjt-devel] Reading SWR from rig Mike et al., Thanks! This is great information. I’ll try it out this weekend. 73, Mike KK7ER ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] Reading SWR from rig
Mike et al., Thanks! This is great information. I’ll try it out this weekend. 73, Mike KK7ER ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
Re: [wsjt-devel] Reading SWR from rig
Thanks for the quick reply, Bill. Do you (or any others on the list) have any recommendations for implementing this "below" wsjtx? In my current setup, wsjtx seems to "lock" the serial device so that other apps (e.g., flrig) cannot access it. It makes sense, but I remember reading about people experimenting with virtual serial devices and such that allow multiple applications to share the rig. This seems a bit fraught with potential issues (e.g., two masters with conflicting commands) but could allow simple things like reading/displaying status information. 73, Mike KK7ER -Original Message- From: Bill Somerville [mailto:g4...@classdesign.com] Sent: Thursday, March 7, 2019 9:23 AM To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] Reading SWR from rig On 07/03/2019 17:01, Deisher, Michael wrote: > Hi. I hope this is not beyond the scope of WSJT-X but since you have > built-in rig control features, here goes. In the interests of having all > important information on one screen is it possible to read the SWR during > transmission and have an alert if the SWR is high. I think this would be > nice to catch sudden antenna issues (due to wind, etc) quickly. If this is > not currently supported, is there a way to send/receive custom messages > to/from a rig while wsjtx is transmitting? > > Thanks! > > 73, Mike KK7ER Hi Mike, this is out of scope, the CAT control in WSJT-X works at a level of a basic virtual rig, reading the SWR is not available for many rigs and even where it is, it is not available via every CAT mechanism WSJT-X supports. Basically if it can't be done for all we are not going to support it unless it is a must-have feature for WSJT-X operation. 73 Bill G4WJS. ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel ___ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
