In the "Tweak my peak" thread, NU0C said this:
/On CW, definitely operate below the ALC level. The quality of the transmit signal starts to degrade when you go into ALC.// / I decided to take a look at that today, using my Orion II and NaP3 panadapter to examine the TR7 output spectrum as the ALC was varied. My TR7 is setup to put out 100W at the point on the carrier level control just before where the the LED comes on (on 20M). The TR7 was operated into a dummy load and the Orion had no antenna connected and 18 dB of attenuation dialed in so the TR7 signal didn't overdrive the panadapter range. I watched the panadapter display as I rotated the carrier level control from that point to full clockwise. The ALC LED came on at about the 1 o'clock position. The power maxed out at 115 watts. I saw no change in the spurs I saw at all over that range. The strongest spurs were 60 dB down from the carrier. So, it appears, at least on my TR7, that there is no degradation in the CW signal (looking 40 KHz in each direction from the carrier) that is related to ALC action. Maybe if my TR7 were adjusted for maximum output, other factors might cause increased distortion that would appear to be related to the ALC level (but might not be). I checked again on 10M CW (where my max output is set to 80W) and found the same thing to be true (but spurs were 67 dB down). 73, Floyd - K8AC
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