>
> Sorry to drag this out but its a problem. Noise generated by switching
> supplies... I used the TenTec switcher that came with the Orion and it was
> clean. The build in switcher in my Icom 775 is also very clean. They are
> good design. But go buy a network router or switch, or have a cable box
> installed in your house, or even in your neighbors house, and you may get a
> lot of noise across the HF spectrum, with strong warbly carriers at regular
> intervals. The switching supplies are basically an oscillator that drives the
> power devices to produce the output voltage. Harmonics of that oscillator
> cover the spectrum. Wall warts are terrible sources, such as those used to
> power routers or cable boxes. I had to replace the wall wart on my router
> with a traditional DC supply to clean up one problem, but there are many
> other oriental wall warts elsewhere in the house, all creating hash. I have
> HF mobile and I can cruise the neighborhood and hear them as strong signals
> everywhere.
Nuff said. 73 Jim N4BE
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