On 25 Jul 2015 at 13:54, Jim Brown wrote:
> Each of those birdies around 14030 are synchronized to the clock on
> someone's router or switch. If you have neighbors, you'll hear a birdie
> for each of them. Identify your own by killing power to your router or
> switch. Ethernet also produces birdies around 21060, on the low end of
> 10M CW, and the low end of 6M. There are also a few on 30M. These are
> the ones I've noted because I'm a CW op -- if you work SSB, you may find
> more. :)
Thanks for the info. At least 90% of my ham radio time is spent on CW. My
CW-tool is a 1936 McElroy "MacKey", which an Elmer gave me around
1960.
> > I haven't tracked that one down yet, but suspect it is some sort of
> > switching
> > power supply somewhere close by.
>
> Right -- they are harmonics of Switch-Mode Power Supplies. Everything
> from wall warts to computers to TVs to battery chargers of all sorts.
They are very seriously ticking me off. None appear to be in my own
home...so far.
> Long cables will need a choke at both ends, and you may also need a
> choke on the power supply cable.
>
> Consider adding WiFi adapters to your wired computers to eliminate
> radiation from those cables. I've been using nothing but WiFi in my home
> and shack (which is in a detached garage), and have all the bandwidth I
> need -- enough to support streaming audio and video.
Due to the way this home is laid out, WiFi doesn't reach to everywhere it is
needed.
My shack is in the far basement, and WiFi doesn't reach there, dang it.
Ken W7EKB
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