Hi again, Ed. Oops, - this isn't the website I was thinking about.. heh heh. Oh yes... it's a mailing list! I remember... I remember...
Check Dino's article on DX-100 screen modulation at http://www.amwindow.org/tech/htm/scrnmod.htm You can also check my articles on peak-limiting compressors at http://www.amfone.net/AMPX/61.htm and http://www.amfone.net/AMPX/issue_number_79.htm Bacon, WA3WDR ----- Original Message ----- From: "Edward B Richards" <[EMAIL PROTECTED]> To: <amradio@mailman.qth.net> Sent: Wednesday, April 14, 2004 8:03 PM Subject: [AMRadio] Modulation Question > Hi Guys; > > I am new to this list so please forgive me if my questions are dumb or > redundant. I just rebuilt a much abused Heathkit DX-100B. As far as I can > tell it is operating OK into a dummy load. I have not put it on the air > yet. For one thing, I don't have a 75 meter antenna up yet. I have a > mobile ant I will install as soon as I have time. I do have a MFJ G5RV jr > that is good for 40 meters and higher. I have not heard any AM on > anything but 75 meters. Is there activity on 40 and / or 20 meters? > > I modified a scope to serve as a modulation monitor. I noticed 2 things > that puzzle me. > > 1. It is hard to tell modulation percent with voice as the waveform keeps > changing and unless I use a sine wave I can't sync it to get a good > envelope pattern. Any trick to this? > > 2. Using the mod mon I see that it is very easy to over-modulate. If I > keep the modulation down so I don't see short bright lines in the center > of the screen (carrier disappearing, I think) , the average modulation is > around 50% except for occasional peaks. Is this normal? would a > compression amplifier help? Thank you. > > 73, Ed Richards K6UUZ > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio >
