as I am lowbands enthusiast and the Elecraft K3 transceiver owner also... I am interresting in any kind tools, h/w as same as K3 setting how to pick up the very weak CW signals on the lowbands (160/80/60/40m).
I started to play with wide variety of AGC system setting in my K3 and I am currious which kind of setting is used on K3 by other users...
In fact I used for long time the AGC off in cases of pulling weakest sigs out of the noise but specially in pile-up it was really danger when the strong sigs attack my ears.
For that reason I would like to use all of opportunities of AGC system in K3 with proper setting. So I will be happy for any kind of settings hints and experiences for CW weak sigs handling.
I am trying to play with the AGC system setting in order to optimize to my needs (weakest CW sigs on lowbands). I am sure that it will be different from other users also because of my local background noise/noise floor environment, disturbation and other noise sources...
My original setting was for years as follows:
AFV TIM: 1000 / AGC DCY: NOR / AGC HLD: 0.00 / AGC PLS: NOR / AGC SLP: 14 / AGC THR: 3 / AGC F/S: 120/20
... but it sounded so noisy and I commonly turned AGC off in order to get quieter RX for weak sigs. Of course that I was attacked by strong sigs in pile-ups or contests and I was punished when AGC was off.
After some discussion on Elecraft reflector I got few recommendations from which I finally decided to try this config:
AFV TIM: 1000 / AGC DCY: SOFT / AGC HLD: 0.20 / AGC PLS: NOR / AGC SLP: 000 / AGC THR: 8 / AGC F/S: 200/20
... which was recommended by several users for weak CW signals reception. (many thanks to Merv, K9FD/KH6)
I found very quickly that the receiver appeared a bit noisy so I added N1EU pink noise roll-off on RX EQ.
I used the left side red column settings:
http://n1eu.com/K3/K3_notes.htm (many thanks to Adrian, VK4TUX)
It helped I guess but I realized that the behavior of AGC in my K3 with this setting is in general not what I am looking for and I do not like it so much. The improvement is that when there is no signal on frequency then this setting of AGC sounds more quiet than AGC off for now! Unfortunately I do not like the "slow pumping" of AGC which is pulling down the receiver gain some time...
So I am looking for another settings or ideas and I am going to make more research.
73 - Petr, OK1RP