Thanks Barry for the suggestion to run some curves while changing the RF gain position. I've done that and I'm not sure I understand what is going on yet. Need to think about it a bit. I'll post the curves up on ke7x.com in a while. Fred
Fred Cady fcady at ieee dot org > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Barry N1EU > Sent: Thursday, December 09, 2010 8:11 AM > To: [email protected] > Subject: Re: [Elecraft] An AGC story > > Thanks Don. I just realized that I can do some quick > experiments to get my > answer using an XG2's s3/s9 capability and noting audio level > increase with > AGC Off and then with AGC On and reducing RF Gain until same > audio increase > is accomplished. > > An aside to KE7X and W4TV: I too wish we could try > experimental firmware > that significantly raised the max AGC THR value. > > And to K6LL: Yes, I too fear loss of weaker signals > > 73, Barry N1EU > > On Thu, Dec 9, 2010 at 3:00 PM, Don Wilhelm > <[email protected]> wrote: > > > Barry, > > > > Without doing any measurements it may be difficult to say > precisely, and I > > would think there would be a bit of difference from one K3 > to another. > > > > However, there is a quick and easy way to accomplish that - > note that the > > S-meter increases as the RF gain is reduced. So if you > want to increase the > > AGC Threshold by (say) 3 S-units, disconnect the antenna, > and reduce the RF > > Gain until you move the no-signal S-meter up by 3 S-units. > That should be > > close to your goal. > > > > 73, > > Don W3FPR > > > > On 12/9/2010 9:07 AM, Barry N1EU wrote: > > > >> > >> Cady, Fred wrote: > >> > >>> I made some measurements and have posted the results for > your perusal > >>> and information at www.ke7x.com. > >>> > >> Very interested findings - Fred has a graph of AGC action > with AGC THR=8 > >> labeled figure 3 on http://www.ke7x.com/home/the-k3-agc-story : > >> > >> So I ask this group: is it possible to raise the AGC > Threshold from s3 to > >> s6 > >> or s9 by simply reducing the RF Gain control? Can anybody > estimate what > >> settings of the RF Gain control would accomplish that? > >> > >> Barry N1EU > >> > >> > ______________________________________________________________ > 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 > ______________________________________________________________ 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
