Brett, Since you suspect that the receiver is being de-sensed by the AGC, try turning the AGC off and controlling the level with the RF Gain. If things seem more 'normal' that way, I suggest you try adding a filter to the AGC IF - see LA3ZA's mod page for 2 examples of how to do that.
73, Don W3FPR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of VR2BrettGraham > Sent: Thursday, December 29, 2005 7:39 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] A question about low sensitivity > > > Compared against other rigs here, my K2 (24xx) seems deaf & more > so on some bands. > > Much less so now after aligning the BPFs with spec-an & tracking > gen - but still noticeable. > > This was before narrowing BPFs so as to avoid AGC responding to > out-of-band energy & may still be due in part to AGC even after > trying LA3ZA mod (a noticeable improvement, but seems to need > _much_ more help than that, at least in this part of R3 with decent > antennas). > > It became very obvious tuning across the band after adding LA3ZA > mod that sensitivity varies depending on energy level at the AGC > image frequency. > > But this apparently is not an issue in either R1 or R2. > > 73 & HNY/HLNY, VR2BrettGraham > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
