I have used the APC BE750G for many years without any known receiver interference problems. In fact, I have 4 of them running in the same room as my radio right now. Using a portable AM radio, I did not hear any strong periodic buzz at or near 520KHz.
I hope you find a suitable replacement UPS, Bill. 73 de Drew K9CW On 12/23/2013 12:30 PM, Bill Riches wrote:
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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