Sorry for being slow to reply. Oh yes, a coil wound on a core made from "Ferrite" or "Powdered Iron" will be a source of IMD products, the culprit being the core. The level of the IMD products generated by a core depends on a number of factors, which we could discuss "Off List" if you wish.
While I understand Lyle's point concerning the AGC, I cannot shake my suspicion that something in or near your antenna is behaving as a mixer, and is the source of IMD products. The problem with adding the DDS' signal by coupling to the antenna is that you have no control over "unwanted" mixers in the vicinity. To disprove (or confirm) my suspicion, my suggestion is that you build a hybrid combiner, and use it to inject the BC and DDS signals into the K3. 73, Geoff GM4ESD On Wednesday, November 24, 2010, at 7:59 AM, Ramiro Aceves wrote? > Can the toroid inside the antenna T tunner > be the culprit? Any ideas to test will be welcome. ______________________________________________________________ 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
