[HFbeacons] UPS interference
- From: "Bill Riches" <bill.riches@xxxxxxxxxxx>
- To: <hfbeacons@xxxxxxxxxxxxx>, <navtexdx@xxxxxxxxxxxxxxx>, <ndblist@xxxxxxxxxxxxxxx>, <perseus_SDR@xxxxxxxxxxxxxxx>
- Date: Mon, 23 Dec 2013 13:30:07 -0500
Have been tracking down intermittent RF interference while using my Perseus
for beacons and navtex. There would be a raspy signal starting about 130
KHZ and harmonics 260 KHZ and the baddie at 520 KHZ. Its signal strength is
about s9 on the receiver. It sounds like a buzz saw and is on every 10
seconds or so for about 3 seconds. I thought that it was from power company
stuff - meter reading, switching signals, or even our neighbor's dog fence!
Not so. It is in my home. Fired up a portable am radio, set it on 520 KHZ
and the racket was loud and clear in the shack. Turned off the power mains
and it went away. Found that it was coming from my APC XS1500 computer UPS!
Seems the swichmode battery charger in the unit is working fine! Every 10
seconds.
I called APC and tried to talk with a tech and that did not happen. The
"tech support" person suggested a power strip! I asked if they had any
units in their line that did not have this interference and she said she
would check. After 5 min she said no we dont.
Have any of you found a UPS that may not have this problem?
73,
Bill, WA2DVU
Cape May, NJ
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