Thank you for your explanation Wayne. You are correct; turning off the noise blanker eliminates wide-band key clicks from strong, wide signals.
Trying to put numbers to your "Aggressive settings of the noise blanker," I set about to find the NB level at which the clicks became noticeable. To my surprise, for the first strong signal I heard, I found NB levels of zero and 25 produced clicks, but a level of 14 did not. For other strong signals I heard over the next few days, a NB level of 0 always produced clicks, while other levels had varying effects. In the end all I learned was that NB levels were mostly unpredictable in how they produced signal artifacts, except that they almost always did. Vic, W9RGB > Message: 10 > Date: Wed, 26 Jan 2022 12:37:48 -0800 > From: Wayne Burdick <[email protected]> > To: Victor Abell <[email protected]> > Cc: Elecraft Reflector <[email protected]> > Subject: Re: [Elecraft] K4HD Executive Summary Request -- strong > signal performance > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > Aggressive settings of the noise blanker can cause signal artifacts. Make > sure the NB is off for any wide band tests. > > 73, > Wayne > N6KR > >> On Jan 26, 2022, at 11:20 AM, Victor Abell <[email protected]> >> wrote: >> >> While I have a K4HD module on order for my K4D (0406) I am also >> interested in Wayne's comment about strong signal performance. >> >> On the CW bands, particularly 17 meters where I often operate, >> many times I have observed strong CW signals whose keying causes >> key clicks to appear some KHz away from their frequency. For example, >> the other night a strong signal from W1AW code practice at 18.0975 >> could be copied by its key clicks at 18.079. >> >> I have heard this behavior on other bands -- e.g., 40 and 20 meters -- >> and have reported it to [email protected], along with videos. >> So far I haven't heard any explanation for these key clicks. It could >> be that I have a flawed K4D or am using some settings that cause it. >> (I wasn't using either pre-amp when I heard W1AW's clicks.) >> >> Vic, W9RGB ______________________________________________________________ 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]
