Tommy, I have 8 pole filters for 400, 1000 and 2800 Hz. I am almost always using the 400 on CW. I use QRQ mode whenever possible. I found various sources of clicks including bias switching in my amplifier, and a switched power source for my Pixel Loop. I removed everything to isolate the problem. All tests were done in TX TEST mode, no RF generated.
The most bothersome K3 generated noise is a click when returning to receive state. You hear it in full or semi- QSK mode when returning to receive. The amplitude of this click depends on the amount of noise or signals in the 'channel'. When listening to rx noise with no antenna, there's no click. The worst case is a big pileup. There is also a noise that is hard to describe, sort of a fuzziness around the sidetone. That also depends on the amount of signal and noise in the background. Turning down either the audio or RF gain helps with both artifacts, but makes the output lower than desirable. I talked to Wayne and Lyle a long time ago about possible ways to ameliorate these noises and they had some ideas, but I haven't heard anything recently. Vic 4X6GP/K2VCO > On Dec 4, 2014, at 3:22 PM, Chester Alderman <[email protected]> wrote: > > Hi Vic, > > With interest, I read your emails about the K3 QSK and the noise it produced > and I have a question for you. I’ve had my K3 for about three years and I > purchased it with a full complement of CW filters for both receivers, > including the 8-pole 250 hz filter. I normally run my radios in full QSK, but > of course, depending on sending speed, running the K3 in full QSK means you > lose too many other good features. > > > I never really noticed the noise generated while in full QSK until recently, > and it is quite bad! About a year ago I changed my 8-pole 250 hz filter to > the 5 pole 250 hz filter and actually I think that is when I started noticing > how bad the pumping and generated noise from my K3 sounded. Of course I run > AGC-Fast, with no preamp (unless on 10m and then only seldom have the preamp > turned on). > > > My question to you is do you have the 250 hz filter installed in the main Rx > and if so, is it the 8-pole or the 5-pole? I think right after Christmas I am > going to re-install my 8-pole filter just to see if that has any bearing on > the awful QSK noise. > > Also, have you had any response from Elecraft on this issue? > > > Thanks for any comment Vic and 73, > > Tom – W4BQF > ______________________________________________________________ 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 Message delivered to [email protected]
