Fred, are you expecting the AGC OFF curves to always produce higher output than the ON curves? I'm not sure that's a correct assumption. I think the purpose of OFF is that you have control over the curve, that is, where you place the linear part of the dynamic range. It's like a variable attenuator in a spectrum analyzer.
There are two truths regarding AGC OFF: As you reduce the RF Gain you should see a drop in audio output. AGC ON is always going to give you a more compressed input-output characteristic, compared to AGC OFF. That's what AGC does; it wants to make signals equal to a greater or lesser extent depending on your AGC parameters. It looks like your measurements have proven these two truths. A sudden 10 dB jump at the 9 o'clock or any position is an issue. This brings up a good point... all those who have been experiencing 'pileup mush' should make sure that their RF calibration is correct. I bet you that's half of the problem. Al W6LX ________________________________ There does seem to be something strange in the way the RF gain works. I also see the 10 dB change in audio level at the 9 o'clock position. In addition, the RF gain position seems to affect the way the AGC on and off works as shown on http://www.ke7x.com/home/miscellaneous-k3-information/unexpected-agc-behavior ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
