http://www.ke7x.com/home/miscellaneous-k3-information/agc-4-51
The transfer characteristic is pretty linear from an input signal of nearly -120 dBm to about -45 dBm with AGC off. Signals above that are being clipped by some other non-linear process, probably the hardware AGC. I don't remember if I had the AF LIM on when I took these data. Cheers, Fred KE7X ________________________________ From: Elecraft <[email protected]> on behalf of W0MU Mike Fatchett <[email protected]> Sent: Thursday, February 23, 2017 9:08 AM To: [email protected] Subject: Re: [Elecraft] K3 Receiver mush What happens when you turn the AGC off and ride the rf gain? Do these setting still have some effect or should they be set up differently? I assume when you use 12/8/soft most people are using AGC-F? On 2/22/2017 1:54 PM, Irma Linas wrote: > Hi everybody, > > Following the advice in one of the posts here, I have changed the AGC > settings on my K3+ ( new sync and IO boards as per Elecraft mods kit > turning the old K3 actually into K3S). I've put the AGC THR to 12, AGS SLP > to 8, AGC DCY to SOFT in the Config menu. > Whaw! The efffect was immediate ,very obvious and pleasant! The strong > signals were strong, the weak were weak , but there was no pile-up mush! > What was especially of great importance for me - the long time annoying > problem of receiver hiss and humm when receiving on narrow band 250 Hz > filter was gone! Before, when switching the narrow filter on on weak > signals on the noisy band the signal actually was totally covered by the > increased noise in the filter. I think now it was due to the AGC reacting > to the noise and amplifying it in the narrow band mode because of the too > low AGC THR setting. When the threashhold was increased, the AGC stopped > equalizing the noise and only work on the signal. The result was awsome! > You switch the 250 hz roofing filter on and all the noise and interfering > stns are gone, and the signal you want is there! It could be a very loud > one or a weak one , but it is there and the noise is not! > I recommend everybody to try out this and experiment with the AGC settings > on your K3 radios! > 73 de Linas LY2H > ______________________________________________________________ > 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 > Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected] ______________________________________________________________ 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 Message delivered to [email protected]
