[ADXA] Ron and your comments.. It IS a complicated subject. Good topic for an ADXA quarterly meeting!

[BILL KENNAMER]

Anybody remember W3PHL? Used to hold forth on 7.296 using a 4-1000 modulated by 2! 4-1000s. 200% modulation according to Fred, he called it “super modulation”. Rack up a lot of paper from the FCC.  It was years before he finally went to SSB. 
FUV


Sent from Yahoo Mail for iPad


On Wednesday, November 6, 2019, 3:52 PM, HamOP <k5yy1 at cox.net> wrote:

#yiv2646152179 #yiv2646152179 -- _filtered #yiv2646152179 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv2646152179 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv2646152179 #yiv2646152179 p.yiv2646152179MsoNormal, #yiv2646152179 li.yiv2646152179MsoNormal, #yiv2646152179 div.yiv2646152179MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv2646152179 a:link, #yiv2646152179 span.yiv2646152179MsoHyperlink {color:blue;text-decoration:underline;}#yiv2646152179 .yiv2646152179MsoChpDefault {} _filtered #yiv2646152179 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv2646152179 div.yiv2646152179WordSection1 {}#yiv2646152179 
     Excellent Jay on your criticisms. I had always used the 2.5 X carrier ratio in the back of my mind.. But guys like you are great to have around.. I always watch closely the ALC coupled with a SMALL amount of compression added, like 3dB or so. Every rig has a proper setting of mike gain and compression, to keep clarity and output proper in driving the amplifier. 

  

   Remember the old days when an AM guy would try to get a KW OUT on AM with his “KW” amp? And they were rated KW input not output… Bang went the tubes. Too many wanted the output to peg the needle at a KW.. The average guy said a KW on SSB should do the same on AM.. On AM my rule was output = about 1/3 of average SSB output.. And you had to figure if it was a class A, AB or C amplifier in each mode position you chose. CW mode usually was a higher voltage in many amps because of the shorter cycle. I always had to look up the mechanics in the handbook back when amps all differed on what tubes they ran and power input capability, etc. Then regulations went from input power of a KW (about 600w output) and with SSB becoming popular, it became peak output and the average varied according to compression and mike audio output ranges. 

  

   It ain’t simple and the arguments between “wizards” points that out.. Main thing is how it sounds on the other end and not to hear the clock ticking in the background or the thunder outside or the wife yaking from the kitchen of the guy you were in QSO with, and for sure not wanting to hear the FAN on the amp or power supply roaring between words.

   >>> Bottom line: Stick to CW and “let it rip”! Forget audio and tweaking everything 20 times to ‘get it right’… Ron XK knows a lot about what you brought up, considering his radio and TV background.

San

  

Sent from Mail for Windows 10

  

From: jayw5jay
Sent: Wednesday, November 6, 2019 3:18 PM
To: Ron, K5XK; ADXA
Subject: Re: [ADXA] Importance of Clean SSB TX Audio

  

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 Jay

  

  

  

Sent 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

 

  
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