Thanks, James. Yes, AGC off is the last weapon to use.
73 Johnny VR2XMC ----- 郵件原件 ---- 寄件人﹕ JAMES ROGERS <[email protected]> 收件人﹕ Johnny Siu <[email protected]> 傳送日期﹕ 2010/11/10 (三) 9:09:09 PM 主題： Re: [Elecraft] Manual notch In K3 I wanted to check something before I answered this, but yes the notch filter is probably in the audio chain, rather than the IF. I picked a good carrier on my K3 and then applied the notch. the carrier was not diminished on the P3 display but completely notched out in the audio from the speaker. If I might suggest, in the situation you described apply the notch, reduce the RF Gain, and turn the AGC off. This will remove the AGC action on the weak signal. I often do this on weak DX as a matter of practice with or without the notch. You can then advance the RF Gain to bring up the weak signal to a comfortable level of copy. 73s Jim, W4ATK On Nov 9, 2010, at 10:18 PM, Johnny Siu wrote: > Hello Group, > > I attempted to manual notch a strong carrier adjacent to a weak station. > Although I was able to notch out the strong carrier (from the audio), there was > no reduction in S meter level caused by that strong carrier. In other words, > the weak station did not pop out from the noise because the stronger > carrier de-sensed the K3 AGC. > > Please advise whether my observation is correct. > > TNX, > > Johnny VR2XMC > > > > ______________________________________________________________ > 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 JIM ROGERS [email protected] http://web.me.com/jimrogers_w4atk ______________________________________________________________ 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
