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Re: [RFI] UPS suggestions

To: rfi@contesting.com
Subject: Re: [RFI] UPS suggestions
From: Cortland Richmond <ka5s@earthlink.net>
Reply-to: ka5s@earthlink.net
Date: Sat, 09 Mar 2013 20:37:22 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
This may help some 105/110/120VAC-area readers decide how to handle short-term power needs.

I would not expect all but the very most critical equipment to need an online always-on UPS. I am typing on a tower-type computer (400W power supply) plugged into a standby Xantrex 400 watt sinewave inverter(1) connected to 200 AH of golf-cart lead acid batteries. An IOTA 55 Amp charger(2) keeps the batteries topped off. That does have some discrete RFI, but not on frequencies I use normally, and rarely bothers anything when when the battery is charged, The Xantrex switches rapidly and draws current only when the power is off; I have used it for Field Day operations and not even noticed when the generator ran out of gas. (However, I advise anyone operating that way not to use their car battery to run the station.) 1) http://www.xantrex.com/documents/Power-Inverters/XS400/06222006JS_XS400%20Sine%20Wave%20Inverter.pdf
2) http://www.iotaengineering.com/dls55.htm

Power has gone off a few times here, but the switchover is fast enough to be unnoticeable except that only one CFL desk lamp stays on.

I recently found a small Belkin UPS meant for AT&T U-verse systems at a local thrift shop, which I am keeping charged up to run other small electronics that need either AC or "wall wart" power.
http://cache-www.belkin.com/support/dl/p75319-b-bu3dc000-12v.pdf

Cortland
KA5S

On 3/8/2013 1010, Pierfrancesco Caci wrote:
...should I be lured by an on-line, sinusoid waveform UPS, or am I likely to 
get lower RFI from a
line-interactive one that doesn't keep the inverter on at all times?

The UPS would be used only for the PC, Monitor, switch and maybe the
printer if there's a filtered, non-protected port.


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