On Wed, May 5, 2010 at 9:24 PM, Jim Brown <[email protected]> wrote: > First, make > sure your Noise Blanker isn't turned on. Noise Blankers can CAUSE key clicks. > Second, if you still hear clicks,
Afraid I can't go with you on this one, Jim. Simply saying don't use NB in a K3 doesn't cut it. In analog RX, the only available noise blanking is a purely reactionary process which shuts off the IF for a short time. In the K3, there are TWO processes, not one. The first is the traditional noise blanker from analog radios, retained because it is still useful for certain noise. The SECOND NB process is pure DSP. Both processes come up for settings when the NB button is held to get LEVEL, "dSP" and "IF". Only the "IF" is the traditional analog IF chopper, and this method may be set to "OFF" with VFOB. Personally, I rarely use this method, though it does work well on some rare noise on 80m that I have never identified. The OTHER method: DSP noise blanking takes place entirely in the number soup and is NOT subject to the key click generating problems. As best as I can tell from watching a scope, it doesn't acheive its results by blanking, but rather by detecting suspicious high rises in the wave form that qualify for noise spikes and subtracting the wave form. It has proven its ability to reduce key clicks, having used it sucessfully on the worst of them in DX tests on 40m where high power EU and New England stations are still generating them into our 5 element fixed northeast monster quad. In my prior post I recommended a DSP only NB setting for key clicks and I stand by that, And yes we have tested over and over that click levels track an input attenuator precisely down even 60 dB, so the K3 is NOT generating the clicks in its RX. Hamdom has been very stubborn about recognizing clicks as their own problem and for the most part has blamed everything except the keying envelope. And even when the K2 in its early years got a mod from Wayne to a nicely shaped and quiet waveform, there were denials on this very reflector that the K2 had a problem, and "I'm not going to do that mod", etc. 73, Guy. ______________________________________________________________ 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
