Oops, that's SMTR MD AbS below. ----- Original Message ----- From: "Guy Olinger, K2AV" <olin...@bellsouth.net> To: "wayne burdick" <n...@elecraft.com>; <g...@doctorgary.net> Cc: <Elecraft@mailman.qth.net> Sent: Saturday, January 24, 2009 8:03 PM Subject: Re: [Elecraft] Pumping with K3
> Gary, > > First off engage the ATT and turn off PRE for receiving on your transmit > antenna on 160. (You may not notice you have these on if you are running > SMTR MD in the Config Menu.) If the offending station is really loud he > may > be kicking the hardware AGC. > > Make sure you actually are using your 250 8-pole filter. Have seen some > tripups on that issue here. One person moved filters and didn't change > the > Config Menu to match it. Another added a filter but didn't turn it on in > Config Menu. Make sure you are running a zero offset on 8-pole types. > > Make sure in Config Menu you have AGC PLS nor. > > Then set up the Noise Blanker: > > NB Level IF OFF <and> dsp t1-7 <or> dsp t2-7 <or> dsp t3-7 Try > t3-7 first. > > Use NB when you are next to clicky or sharp sounding stations. > > This NB setting will make all the CW signals sound soft, t3-7 most so. > But > in some conditions this has dropped key click S-meter pumping by 4 or 5 > ticks on the S-meter. (Thank you Lyle...) > > I'm using FW 2.78, and don't know when Lyle's cute NB functions showed up. > I have zero problems with 2.78, upgrade if you're backlevel. > > 73, Guy > K2/K3 #1239 > > > ----- Original Message ----- > From: "wayne burdick" <n...@elecraft.com> > To: <g...@doctorgary.net> > Cc: <Elecraft@mailman.qth.net> > Sent: Saturday, January 24, 2009 5:42 PM > Subject: Re: [Elecraft] Pumping with K3 > > >> Gary, >> >> If your AGC is getting pumped by nearby stations even with the 250-Hz >> filter engaged, it's almost surely due to excessive transmit bandwidth >> on the part of those stations. Their keying sidebands may extend far >> beyond their carrier frequency. This is a common problem with rigs that >> have poorly-shaped keying and/or poor phase noise characteristics. If >> these stations are well over S9 and very close to your frequency, you >> may not have any really effective defense other than to ask them to >> reduce power, improve key shaping, or get a new rig. >> >> The K3 is extremely clean in both regards, so chances are you're not >> bothering *them* :) >> >> You might try speeding up AGC-F (see associated menu entry) or even >> turning AGC off, backing down the RF GAIN, and possibly NR and DSP NB. >> >> 73, >> Wayne >> N6KR >> >> On Jan 24, 2009, at 2:20 PM, Gary Smith wrote: >> >>> I'm working the 160 contest and am wondering if there's some hint to >>> help me overcome pumping from nearby stations. I am using the 8 pole >>> 2.8K, 1K & 250Hz filters on CW. I'm mostly tuned down to 50Hz as >>> that's what I need to do to find the DX that's being covered by the >>> local stations calling CQ. >> >> --- >> >> http://www.elecraft.com >> >> _______________________________________________ >> 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 >> > > > _______________________________________________ > 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 > _______________________________________________ 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
