Mike et al -
It might be good to check to see if you aren't doing it to yourself. 14.318 divided by 4 is 3.579 MHz, the "color burst" frequency used by millions of consumer devices as a reference frequency, and not just TV sets. I have heard carriers on or around that frequency with strengths up to and including "S9" for literally years. Harmonics from poorly designed or shielded oscillators in TV sets, computers, clocks, DVD players, VCRs, microwave ovens, game players, fax machines, printers, telephones, toys, medical devices, and many more items have polluted this frequency for at least 20 years. Just now I checked and can hear at least 5 separate "sources" in a casual check of the frequency - and those are just the "loud ones" from a random beam heading. I am sure there are dozens more underneath the louder ones. . The sources are so ubiquitous that it is virtually impossible to escape them no matter where you live. The signals that you are hearing are probably not the same ones that another ham in the next state is hearing, but there are so many of them that it is unlikely anyone can escape them. They are part of the reason for that FCC warning about "Operation this device may cause interference to nearby radio ant TV receivers ....." (I am paraphrasing here) that you see on so many consumer electronics devices. One reason your DSP may be having trouble eliminating the carriers is that there are usually several on slightly differing frequencies. The crystals aren't all that accurate in some devices, and by the time we get to the 4th harmonic, differences of a few tens of Hertz to several hundred Hertz are common. Most of these oscillators are not in some type of circuit that is phase locked to a master source, as is the case for some TV broadcasts. Most of them are "free running" in the sense that all they have to be is "close enough" to perform the task at hand., - Jim, KL7CC Mike-WE0H wrote: > That carrier on 14.31800mc is nuts loud in Minnesota. I tried to check > in but only one station heard me and repeated my callsign. Even the DSP > won't wipe that screaming carrier out. > > ______________________________________________________________ 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
