All good suggestions, Ron -- including turning off the NB if not mentioned previously. Engaging the NB function oftentimes produces internally-generated clicks.
Paul, W9AC ----- Original Message ----- From: "Ron D'Eau Claire" <r...@cobi.biz> To: "'Elecraft Reflector'" <elecraft@mailman.qth.net> Sent: Tuesday, December 01, 2009 12:51 PM Subject: Re: [Elecraft] K3: killing RX key clicks > Key clicks can be generated by several different mechanisms within the > receiver itself. Paradoxically, it's easier to produce false clicks with a > high performance receiver than it is with a lesser receiver. > > These have nothing to do with the transmitted signal. > > The first line of "defense" is to turn off the Preamp and turn on the > Attenuator to reduce the overall strength of the signals. Next is to set > the > AGC to "Slow" to ensure a strong signal isn't within the roofing filter > bandpass and triggering the AGC while the variable DSP filter is set > narrow > so the beat note isn't heard. In some cases using the RF gain to control > the > level helps a great deal. Another approach is to use a narrower roofing > filter or to shift your bandpass so the edge of the roofing filter is very > close to the desired signal on the side toward the interfering station and > as far from the interfering station as possible. Shifting the bandpass may > require you open up your DSP bandwidth to continue to hear the desired > signal or shifting the DSP filter position within the roofing filter > bandpass. > > And, remember, "clicks" are an essential component of a CW signal. They > are > the sidebands created by modulating (keying) the signal. Very careful > shaping of the keying envelope, such as used in the K2 and K3, can > minimize > clicks while maintaining an easily readable signal, but the only way to > completely eliminate clicks is to not key the signal at all. With a really > high-performance you can snuggle up very close to a signal, as many here > have noted. When you do that, you're much more likely to hear the > essential > clicks required for good keying. > > Ron AC7AC > > -------------------------------------------------------------------------------- > ______________________________________________________________ > 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
