The other thing, too, is if your antenna is just relatively close in proximity to your shack, it won't matter how well balanced your feedline is; you may still end up with cables inside your house that are resonant at or near the frequency where you're transmitting, or at least near enough to cause problems, with an intentional radiator (your antenna) nearby. For whatever reason, this always seems to be worse on 20 meters than other bands with home electronics. Then I don't know of an option for offending equipment other than a few turns through some hefty ferrite on the resonant cable(s).
(As I'm sure you know, a lot of home electronics are poorly executed with respect to keeping out common mode currents... Jim Brown K9YC has published a lot of really great information about this state of affairs. Sometimes the entry point for common mode noise isn't what you would expect, too.) If you're like me, and you have a dipole antenna mounted on your roof, getting it up a little higher may help some too...or just learning to live with lower power output. My threshold at home with digital modes on 20m is about 27 watts... below that, everything is fine. Above that, everything is terrible. Fortunately, most of the time I don't even need that much to make a successful contact, and even with modes like WinLink, 15 watts is plenty. Nick On 12 January 2017 at 08:21, John Stengrevics <jstengrev...@comcast.net> wrote: > Thanks Don. I already have ferrites all over my coax cables, Anderson > power cables, literally all over the house. > > Will try on the USB cable as well. > > John > WA1EAZ > > > On Jan 12, 2017, at 11:17 AM, Don Wilhelm <donw...@embarqmail.com> > wrote: > > > > John, > > > > The first step to solving RF-in-the-shack problems is to work on your > antenna system. Better common mode chokes on your feedline(s). > > See the information by Jim Brown K9YC at http://audiosystemsgroup.com/ > RFI-Ham.pdf. > > > > If you still have problems after taking those measures, then use ferites > on cables as a last resort solution. > > > > The reason I say this is because if you have RF interfering with the > wiring in your station, you likely have similar interference on all wires > in your station - you can fix one or two, but another similar problem will > rear its ugly head later on. > > If you fix the problem at its source, you will fix a lot of "strange > behaviors". > > > > 73, > > Don W3FPR > > > > On 1/12/2017 11:05 AM, John Stengrevics wrote: > >> Hi Nick, > >> > >> Thanks for the suggestion! I turned the power down to 2 watts and the > problem went away. > >> > >> What’s the solution, ferrites on the USB cable? > >> > > -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
