Aaron makes a good point, this happened to me. I did not think the
supply was generating any noise till I really tested with another
receiver nearby, turned the transceiver connected to SPS on / off, and
turned the SPS on / off. I learned to identify the noises and now I
wonder how many SPS's my neighbors have. I hear lots of the SPS buzzing
here and there at various signal levels.
Clark
WA3JPG
On Monday, March 10, 2003, at 02:41 PM, Hsu, Aaron wrote:
> I often hear from others that they don't hear the "hash" from the
> switching
> power supply (SPS) they own. In thinking about it, I remember that I
> lived
> with switching noise for a couple of years not knowing that it was hash
> generated by the SPS that powered my laptop computer. It was only one
> day
> when I had the SPS unplugged from the wall that I notice the bands were
> quieter. Living in the greater Los Angeles area, I had always
> attributed
> the noise to atmospheric, industrial, or nearby CB sources when, in
> fact, it
> was locally generated! I now knew *exactly* what SPS hash sounded like
> and
> how to ID a noisy power supply.
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