Bob: You nailed it again. 1500 Hz is where I normally set my audio so when I do my quick test before operating this pulsating is what I see.
I went to 1700 Hz (and a few others) and ran the same tests. It was steady as a rock in tune and exactly as expected in transmit (4+1 blinking). Sometimes things looked real good. Sometimes they looked strange (pulsating). I always felt there was something intermittent but now I know. The issue is simply where I chose to test. I'd have never figured that out. Thanks and 73! Kev N4TT On Tue, Jun 25, 2019 at 4:17 PM Bob McGraw K4TAX <[email protected]> wrote: > The pulsating is the result of the refresh rate of the display and the > 1500 Hz tone. Change the TUNE tone to a non- 500 Hz interval such as > 1250 Hz. or 1700 HZ as such. Yes, in FLDIGI the TUNE tone is a single > frequency you have selected on the waterfall scale or in the box at the > bottom of the screen. > > When you setup and adjust the audio levels, the radio mode must be DATA > A for PSK-31. The audio level for correct ALC indication should show 4 > bars solid with the 5th bar flashing. The Elecraft radios DO NOT > operate like other brands in regards to the ALC indications. The > actual ALC in the Elecraft starts at and after the 5th bar on the ALC > scale. Before that the "audio level" is indicated. Then set the PWR > knob on the radio for the power output you desire. DO NOT adjust the > audio level to change power. > > There are 3 places where audio level is controlled and each one needs to > be correct. First is the SPKR level out of the computer. This should > be about 30% {-18 dB} or so. Then output attenuation on the lower > right of FLDIGI which should be about -10 dB to -15 dB . Then the Line > Gain on the radio {adjusts by the MIC knob} to about 30. These are > "ball park" numbers and should get you up and running with a clean > signal. If any one or more is near minimum or near maximum, you need > to investigate further. > > If needed I can send screen captures. > > 73 > > Bob, K4TAX > > > On 6/25/2019 2:42 PM, Kevin, N4TT wrote: > > I've made a few PSK-31 contacts on the K3s and I've not gotten any bad > > reports. However, I'm still a little concerned about what I see for ALC. > > > > > > The video below (no audio) shows the ALC meter responding first to a > "TUNE" > > command from fldigi. This sounds like a pure tone in the headphones but > the > > ALC meter responds oddly, almost like it is pulsating. I expected ALC to > > pretty much be steady. > > > > Next in the video is just clicking T/R in fldigi with no typing. It > sounds > > as expected in the headphones (a trilling sound). The ALC response looks > > better but I can still see the pulsations in there. I expected to see 4 > > bars solid and the 5th flashing. > > > > https://photos.app.goo.gl/4AaLaVu1r8UDv5LT9 > > > > Am I reading too much into this? Is this how your K3s responds? > > > > I'm using the K3s sound card. Level in Windows is -14.7 dB. Level in > fldigi > > is -12.7 dB. The level control on the K3s is set for 18. > > > > 73, > > Kev N4TT > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [email protected] > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
