One possibility: “microphonics” modulating the synthesizer. The source is typically the sidetone being played through the internal speaker. A quick fix is to not use the internal speaker. The solid fix is the Elecraft synthesizer stiffener mod kit.
Easy to determine if this is the problem: change PITCH and see if the offset of the spurs changes. I’ve seen this on a friend’s unit. The spurs were present, but diminished, with an external speaker. The mod kit stamped them out. Bill, K1GQ On 2011.01.18, at 13:40, Rose wrote: > I think I recall a thread about spurs being produced by > a K3's TX, but didn't pay enough attention at the time. > > I've since become aware of a K3 that appeared to have > two spurs showing up on my P3. They were about 30db > down from his very strong carrier on 7031 KHZ, and equally > spaced about 1 KHZ on either side. They both could be > "tuned in" and copied as individual signals. I was surprised > when I asked the fella what his rig was and he told me it is a > K3. (;-) > > I have -not- seen these spurs appear on other strong signals > since this event, and follow-up tests with him have not shown > the spurs ... but ... I've not seen his signal as strong as it was > at the time. > > There's no doubt they were "real", but what might be the > cause? Is / was the problem with his K3, my K3 or my P3. > > Thoughts? > > 73! > > Ken Kopp - K0PP > [email protected] > ______________________________________________________________ > 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 ______________________________________________________________ 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
