Don, The preamp was off, and the KNB2 was using the high thresshold. Knowing that, are the symptoms still consistent with IMD?
73, Wayne Conrad KF7QGA On 08/09/11 08:13, Don Wilhelm wrote: > Wayne, > > The KNB2 can introduce IMD in the receive path, especially when using > the low threshold and the wider blanking pulse (NB2). I believe that is > what you were hearing. > If you had the preamp on, the effect would be increased. Normally there > is no need to turn the preamp on for 40 meters unless you are using a > low efficiency antenna. > > 73, > Don W3FPR > > On 8/9/2011 11:01 AM, Wayne Conrad wrote: >> On my K2, in CW mode, and when I crank up the noise blanker by selecting >> NB2 (and the default noise-blanker threshold, "Hi"), I sometimes hear a >> strong signal some distance away from my receive frequency. The signal >> I hear, when this happens, is not a tone. It's more like a spark-gap >> buzz. Today, when the receive frequency was 7.034, I heard a CQ on >> 7.026. The signal on 7.026 was quite strong but otherwise sounded >> normal. FL1 (1.50) was selected. AF2 is installed but was off. If I >> turned the noise blanker off, or select NB1, the interference goes >> away. It doesn't happen often, and is seldom strong enough to be a >> problem, but it does make me wonder if something is out of whack, or if >> I'm operating the radio improperly. Is it just the nature of the >> noise-blanker? >> >> 73, Wayne Conrad KF7QGA ______________________________________________________________ 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
