Hi Wayne, I'd be happy to try the modification. I can do it with one K3 and not with the other.
For reference, here are my configurations and general operation settings when in C6. AF GAIN = high. (I'm thinking maybe to set it low) AF LIM 20 AGC DCY SOFT AGC HLD 0.30 AGC PLS NOR AGC SLP 0 AGC THR 8 AGC-F 120 AGC-S 020 SER NUM 1148 RX EQ 1 -16 RX EQ 2 -16 RX EQ 3 0 RX EQ 4 +6 RX EQ 5 +6 RX EQ 6 0 RX EQ 7 -10 RX EQ 8 -16 When operating, ATT is ALWAYS ON. I don't think I ever took it off except maybe when 15 was dead. PRE never on. RF gain - all over the lot - say between 9 and 3. When there were lots of big signals I'd crank it back and then forget to turn it up again and would CQ in the face of weak callers :-( AF Gain - all over the lot too. I have 250, 400, 1000 and 2.7 kHz filters. DSP _usually_ in the 500 - 700 range, sometimes a little wider, sometimes a little narrower. I don't think I ever went below 300 Hz. AFX never on. I don't' like it but it might be interesting to try. I use Bose QC2 headphones. I wear hearing aids. Most mods have been done to the K3s including the stiffeners on the synthesizers and I have swapped out the DSP boards. I have not done the HAGC mod. 73, Fred KE7X Fred Cady fcady at ieee dot org > -----Original Message----- > From: elecraft-boun...@mailman.qth.net [mailto:elecraft- > boun...@mailman.qth.net] On Behalf Of Wayne Burdick > Sent: Sunday, December 04, 2011 6:59 PM > To: Elecraft Reflector > Subject: Re: [Elecraft] K3 hardware AGC experiment shows promise > > By the way, we'll be happy to send out these surface-mount 1 uF > capacitors (or whatever we determine is the best value) to anyone who > would like to try the experimental mod, immediately and at no charge. > > These are huge as SMD parts go. Anyone with a fine-tip iron would have > no trouble putting one in. There's no need to take the original, > smaller one off; you can just stack the new one on top. > > If you're in a hurry, you could use any type of capacitor that will > fit, including an electrolytic. Just be sure to put the (-) end at > ground if you use a polarized capacitor. > > 73, > Wayne > N6KR > > > On Dec 4, 2011, at 5:50 PM, Wayne Burdick wrote: > > > > The K3's hardware AGC time constant is a compromise between recovery > > time and IMD due to modulation of the loop. C238, on the bottom of > the > > RF board near the front, sets this time constant. > > > > We did a little experiment today > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
