I just finished playing the two test files that the author supplied, through the sound card to the KX3 and used the Data A input so that there was no compression or TX equalisation taking effect. I had the scope connected to a sampler on a dummy load and the KX3 set to 14.3 MHz at 3 watts PEP.
The RF power levelling in the KX3 does a very good job. Reducing the drive level of the audio well below ALC indication made almost no difference as the KX3 just went ahead and levelled the power again to 3 watts PEP ... I captured the peak output on the digital sampling scope for both the conventional and CESSB signal from the KX3 RF output and here are links to the scope screen shots. First the CESSB https://www.dropbox.com/s/0kjrvzispyb45jy/CESSB%20ESSB%204KHz.BMP?dl=0 The conventional SSB https://www.dropbox.com/s/m4mmlwkcb77540c/conventional%20ESSB%204Khz.BMP?dl=0 Not a lot of difference, certainly not as much as there is if you compare the audio files going into the rig. 73 from David GM4JJJ > On 10 Jan 2016, at 18:36, Michael Walker <va...@portcredit.net> wrote: > > Hi David > > I doubt you ever will. If I remember correctly, what the CESSB does is > correctly clamp the gain while ensuring you continue to get full power. > > The micro second you go over 100%, the radio starts to clamp RF out and in > fact reduces it considerably. You would only be able to tell by watching > your RF envelope in a scope. > > This is all off the top of my head, but that is what I remember. I'll have > to read the paper on it again. > > There are likely others that know more about it than I do. > > Mike > > >> On Sun, Jan 10, 2016 at 11:44 AM, David Anderson <gm4...@yahoo.co.uk> wrote: >> >> Mike, >> >> I don't know why but I kept using ECSSB when I meant CESSB obviously, >> sorry for any confusion! >> >> Although the Elecraft power levelling is excellent, and I have not ever >> had bad reports of audio quality or splatter with my KX3 with the processor >> on or off, it certainly would be nice to be able to increase the talk power >> further as CESSB promises. >> >> 73 from David GM4JJJ >> >>> On 10 Jan 2016, at 16:04, Michael Walker <va...@portcredit.net> wrote: >>> >>> This was presented at Dayton this year. If memory serves me correctly, >> it >>> was installed in SmartSDR 1.2 back in March of 2015. >>> >>> http://www.flex-radio.nl/flex-6000-serie/the-flex-insider/ >>> >>> It is very interesting just how big the impact of overshooting has on >>> killing your RF output. >>> >>> This is one of those ... less is more .. situations. >>> >>> Mike va3mw >>> >>> >>>> On Sun, Jan 10, 2016 at 7:53 AM, NC3Z Gary <n...@outlook.com> wrote: >>>> >>>> Thanks for the link, my ARRL magazines take more time to get to me now >>>> that I am out in the boon-docks. The new QEX article is a good read, and >>>> with flex incorporating CESSB we can hope that maybe Elecraft can >>>> incorporated it into at least the KX3. >>>> >>>> >>>> Gary Mitchelson >>>> NC3Z/4 Pamlico County, NC FM15 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to gm4...@yahoo.co.uk ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
