That's interesting thanks. It means that by aiming for no ALC indication I've been under modulating.
I assume the input stage in the KX3 can take higher levels? On Fri, 28 Jun 2019, 16:35 Bob McGraw K4TAX, <[email protected]> wrote: > Well written generic paper for operation of FT-8 and other digital > signals of like mode. It does not totally nor correctly apply to > Elecraft radios as power management is handled by a totally different > means. And those means and methods suggested in this paper are not > applicable to Elecraft radios for power control. From experience in > set-up and operating different radios and different interfaces, I do > believe that the WSJT-X operating panel which shows the right slider > labeled PWR is very misleading and should be changed to some other > description i.e. TX AUD. > > While many radios use the control of audio level to adjust power output, > this is somewhat misleading as there are control areas available such as > SPKR level in Windows, and Line Gain for the radios or perhaps an > external sound card device. Again, the use of the acronym MIC is > always a frighting term, in as much as many systems produce a transmit > audio level that will overdrive the microphone pre-amplifier input. > Once this occurs, reducing MIC gain will not relieve the distorted audio > as it occurs pre level control in the circuit. Frankly, one should not > connect the sound card to a microphone input without proper and correct > means of attenuating the signal before it is connected to the microphone > input. In addition, this will always preserve the transmit > Signal-to-Noise ratio. > > As to "compression" I take that to mean Speech Processing, which should > ALWAYS be off or set to a zero value. Likewise for EQ, again always > set to OFF or FLAT for transmit and receive purposes as well. > > As a mater of practice, there are three or perhaps four distinct places > that audio levels can be controlled in the transmit path. First is SPKR > level which is the audio level out of the computer. Second is the WSJT-X > PWR slider, and third is the Line Gain within the radio. A fourth, if > used, would be an external interface such as a Signalink or > Soundblaster. If any of these points end up near minimum value or near > maximum value, I strongly suggest further investigation as to why and > remedial steps taken to more "normalize" the control values at all > points in the system. > > Some radios do have "meter" indicators which relate to ALC levels while > others simply prove a visual means usually the illumination of a LED. > In all cases, the indicators should be observed, and the radio operated > accordingly with NO indicated ALC action occurring. Again, regarding > Elecraft radios, the first 4 bars on the "ALC Scale" are audio level and > NOT ALC action. The onset of actual ALC occurs at the 5th bar and higher. > > 73 > > Bob, K4TAX > > > > > On 6/28/2019 9:18 AM, Andy Durbin wrote: > > Does anyone know of any rig that uses "compression" rather than linear > gain control to implement ALC? > > > > ref - https://www.dropbox.com/s/f4uaop5tqwzaweu/FT8Noise6.docx?dl=1 > > > > 73, > > Andy, k3wyc > > ______________________________________________________________ > > 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]
