[ADXA] Importance of Clean SSB TX Audio

[jayw5jay]

Hi Ron,I read the Radio World article a few weeks back and there are few big mistakes that Mark Pearson's made. Such as 1.5 times the carrier that's totally false. It's four times the carrier output for sinusoidal modulation. However I think where he's getting his info mixed up is that using an oscilloscope you will double the current and voltage under 100% modulation?I am sure by now many have sent him the correct info. Other things to consider is that voice modulation is far different from normal programming material.  He is correct that forced asymmetry on programming  audio is not good. However a clean transmitter on voice can easily do 125% into a diode detector with very low distortion.There was another article on the elecraft reflector about adaptive predistortion with the upcoming K4. Anytime you can get a cleaner transmitted signal is always better, in my humble opinion Then the proper eqing for the mic and you're golden.  Even on the elecraft reflector there are the self-proclaimed experts that have their own agenda and axe to grind. They came out pro and con on the Adaptive predistortion. Both sides had good points and no one really got it right.Funny how some of these so-called experts get it wrong in a few places Theory wise, but the main intent is very good. I agree with what he's trying to accomplish, but just a few gachas that can lead new hams in new a AMers astray.  73 JaySent from my Samsung Galaxy smartphone.
-------- Original message --------From: "Ron, K5XK" <qrzthedx at gmail.com> Date: 11/6/19  12:39 PM  (GMT-06:00) To: ADXA <ADXA at mailman.qth.net> Subject: [ADXA] Importance of Clean SSB TX Audio  Interesting post on one of the Ten-Tec reflectors today, citing a trade journal article and the importance of clean TX Audio impacting our ability to work DX.  This is one of the things we try to assist one another with in our weekly ‘3820 Roundtable’ on Sunday afternoons at 1600 local here in NWA … 73/DX, Ron / K5XK “As soon as I hit SEND, I thought of this article from RadioWorld.com.  It covers an age-old subject from an industry expert.  Most of us don't make modulation adjustments on transmitters but the author adds perspective to the belief that transmitters should always be set at 100% (or more) modulation.  It also made me think about the overuse of speech compression:  "Find Your Modulation Sweet Spot", Mark Persons, Radio World Magazine, Oct. 11, 2019>>>  https://www.radioworld.com/tech-and-gear/find-your-modulation-sweet-spotI can think back of many times when I broke a big DX pile-up barefoot simply because my audio was super clean!Enjoy, Steve W  ACØBE”
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