My suggestion: 1, upgrade to lastest f/w 2, tune the center of the passband to 1.4~1.45k(very important)
Hope those will helps! all the best! David,BA4RF 2009/12/17 juergen piezo <plebia...@yahoo.com> > Hi James > > This has been my impression for the last 2 years when using our clubs K3's > > I decided to do a comparison with several radios. > > FT1000MP > TS870S > FT1000D > TS850S > TS930S > > If you blind folded yourself and did not look at the S-meter and switched > between the radios, the K3 was always much more noisy. I did this test on 20 > meters and 40 meters. There is no doubt that the K3's correctly calibrated > S-meter shows more activity. However when you dont look at the S-meter and > just listen you can hear this apparent greater "noise activity" > > What is interesting if there is just signs of a starting thunder storm or > light QRN, the K3 seems to make the QRN sound much worst. However when the > QRN is very heavy its as bad as any other radio. I did also play with AGC > setting and this result was always repeatable. I thought it was the AGC > doing this, however I changed the slope and it appears to be the same. > > There seems to be a mid range window in the K3 that makes the radio sound > much more lively. Above and below this windows thresholds it appears to be > normal in every other respect. > > One thing thats very obvious with the K3 is that you need to play with the > receiver EQ all the time. The difference can be very stunning when you get > it right. > > There can be no one EQ setting that is good for weak and general purpose > listening for both CW and SSB. The K3 on a flat EQ response is poor at very > weak signal SSB work. However, when you adjust the EQ it seems to bring the > radio back to life. > > The K3 needs a default setting thats similar to most analog radios, a > defined bandpass filter that needs no EQ adjustment for CW and SSB. The K3 > for some reason needs a lot of highs and treble to sound decent. Even the > CW note comes alive with real body like a analog radio when the EQ is set > to high /treble boost. My belief is that most who say that the K3 sounds > poor is for this reason. However when you boost the highs the receiver is > very tiring on your ears. So you cant seem to win here > > There is something strange about how the DSP and the receiver chain works. > It sounds great with strong normal signals on a quiet band. I do want to try > a SCAF filter or some other audio filter to see if I can improve things. I > dont have hearing problems and generally i try and leave the EQ set flat. > However this has proved problematic for me, especially on weak SSB and CW. > > I am a casual K3 user and I dont own a K3, however I have spent enough time > operating our clubs K3's which have a broad range of serial numbers many > factory assembled. I would like to try and get the new DSP board to see if > that changes much. Maybe it is because I am a casual K3 user that I notice > all these quirks, these probably may disappear if i used a K3 every day. In > the meantime I prefer any old analog contest radio at the moment. > > John > > --- On Wed, 12/16/09, James Sarte <k2qi....@gmail.com> wrote: > > > From: James Sarte <k2qi....@gmail.com> > > Subject: Re: [Elecraft] Noisy K-3 Receiver > > To: elecraft@mailman.qth.net > > Date: Wednesday, December 16, 2009, 9:42 PM > > Hi Mike, > > > > I've fiddled with all of the AGC, PRE, ATT, RF, and DSP > > options on my K3, > > and still experience a relatively high noise floor - at > > least compared to an > > FT-1000 side by side. > > > > I never gave it much thought until these subject came up on > > the reflector. > > > > Cheers, > > James K2QI > > > > -----Original Message----- > > From: elecraft-boun...@mailman.qth.net > > [mailto:elecraft-boun...@mailman.qth.net] > > On Behalf Of Mike Harris > > Sent: Wednesday, December 16, 2009 12:15 PM > > To: Bill W4ZV; elecraft@mailman.qth.net > > Subject: Re: [Elecraft] Noisy K-3 Receiver > > > > G'day, > > > > The simple fact is that the faithful will always suggest > > that the K3 > > hears more, is more sensitive or is more transparent to > > band noise > > etc etc. Also you have to fiddle with the AGC, PRE, > > ATT and RF gain > > whereas other radios just sound nicer out of the box. > > I don't have > > a problem with fiddling with AGC and equaliser parameters > > to tailor > > the receive to my liking, but to have to do it to make it > > sound > > acceptable is another thing altogether. > > > > There is an often referred to AF filter module which > > installs on the > > main DSP board and apparently cuts out a lot of unnecessary > > high > > frequency audio. Sadly though often referred to it > > just isn't being > > made available despite very positive comment from some of > > those who > > have field tested it. > > > > The KAF2 filter for the K2 made all the difference in the > > world to > > listening to SSB. > > > > Regards, > > > > Mike VP8NO > > > > ______________________________________________________________ > > 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 > -- -------------------------------- All the best! David,ba4rf ______________________________________________________________ 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
