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[TenTec] Cyberpower 3000 rif

To: "Carl Moreschi" <n4py@arrl.net>,"Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: [TenTec] Cyberpower 3000 rif
From: "Denton" <denton@oregontrail.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 5 Dec 2007 07:46:47 -0800
List-post: <mailto:tentec@contesting.com>
Have a station consisting of a TT omni vi and vii.....have an rfi problem...
I have a Cyberpower PR 3000 sine wave ouput, commmercial grade 
uninteruptable power supply that is located in my basement with the case 
grounded to an 8 ft ground rod going thru the basement wall. The input to 
the ups is on an individual circut.
Output via the ups 30 amp 120 vac goes to the radio station on the main 
floor, which shares an outlet with the radio station's power supplies and 
the pc.
Battery pack for the Cyberpower is homebrew using two gangs of 4 38 amp hour 
gas absorption mat batteries wired in series to satisfy the ups 48 vdc 
I notice there is considerable rfi comming from the ups when it is active.
The ups is supposed to be emi/rfi filtered and has an isolation transformer 
on the ups output. Scoping the output of the ups indicates a so called clean 
ac sine wave. Testing of the ac line input and output of the usp indicates 
correct wiring.
Clamp on ferrite chokes on the ac output of the ups has little effect.
I would like to get rid of the rfi into the radio station. Rfi is most 
prevalent on 40 thru 20 meters..the other bands seem to be uneffected.
Radio station is heavly grounded on its own ground rod system, not directly 
connected to the ups.
I could run the hf transcievers on a dedicated circut with a 
powersupply--blocking diode---battery pack, but would much prefer to keep it 
all on the same power source.
Any ideas? Thanks.... 

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