Having 1/4 to 1/2 second recovery time does not sound like AGC-F. By chance, did you have the CW text decode feature engaged? Did you have NR engaged?
- Keith N1AS - - K3 711 - -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of K2MK Sent: Monday, February 23, 2009 11:00 AM To: btipp...@alum.mit.edu; Elecraft Reflector Subject: Re: [Elecraft] K3 receiver desensing on CW during contest Hi Bill: Here are my CONFIG settings related to the AGC. The only ones I played with during the contest were SLP and THR. I always use AGC-F but did occasionally try AGC-S. AGC-HOLD 000 AGC-PLS NOR AGC-SLP 010 AGC-THR 005 AGC-F 120 AGC-S 020 The differing conditions I described were the situation of everyone calling the DX close to his frequency versus one strong station calling 70Hz off frequency. When even strong stations called the DX right on frequency I was able to hear signals through the QRM. When strong stations called 70Hz off of the DX frequency the receiver went quiet and took about 1/4 to 1/2 second to recover after he stopped sending. 73, Mike K2MK Bill W4ZV Mon, 23 Feb 2009 05:31:37 -0800 K2MK wrote: > > I thought it was interesting that recovery was noticeably slow on the > DX station's frequency when this was happening. However, under normal > conditions when US stations were calling directly on top of the DX > station, recovery was fast. Hence the ability to copy the DX station > through the dits when the QRM was on frequency. > Mike this definitely sounds like desense but I'm surprised you experienced it with only S8-9 signals. I'm not sure what you mean about differing conditions on and off the center frequency. Desense will affect everything inside the roofing filter. What speed AGC were you using (F or S) and what were your AGC-F and AGC-S CONFIG settings? I NEVER use AGC-S on either CW or SSB and like at least 120 dB/sec for AGC-F. Also, help your AGC do its job by not running RF GAIN fully clockwise (as mentioned in my previous message). 73, Bill ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
