[RFI] Belkin PureAV™ Home Theater Battery Back up

kd4e doc at kd4e.com
Fri Dec 4 11:02:42 PST 2009

Good info.

What I need is a good UPS that doesn't generate hash while
recharging, maintenance charging, or inline use during a
grid failure.

My goal is for everything important to function off-grid
but I am a long ways from that.

What would you recommend in the way of a UPS (600W or more)
that is RF-quiet, reliable, and provides for external
batteries so the time-up may be extended (without melting
the inverter)?

 > Jim Brown wrote:
> On Fri, 04 Dec 2009 08:44:28 -0500, kd4e wrote:
>> Are they really RFI-clean or do they only address line noise?
> Hi Doc,
> As you probably know, I work in pro audio. The real engineers 
> among us get quite a laugh out of the technical claims made from 
> the purveyors of audio accessories to "clean up that nasty AC 
> line" to make audio gear sound better. 
> I'd guess that this product is a standard backup power supply with 
> a simple power line RFI filter. It probably also has MOVs in it. I 
> would guess that it doesn't MAKE RF noise in standby mode, but I'd 
> bet that it DOES when it's regenerating AC during a power failure. 
> When I'm specifying systems for public buildings (theaters, 
> churches, stadiums, etc) where things need to work with flaky 
> power, I specify the combination of a SurgeX suppressor (for 
> lightning protections) and a backup on DSP-based equipment so that 
> it doesn't lose its brains or have to reboot with a power 
> interruption. If you've got an extra $600 laying around, you could 
> do that for your home stereo. 
> If you simply want to do some RF filtering, look for RF line 
> filters from mfrs like Corcom and Delta. They cost a LOT less. The 
> SurgeX units also include very good RF line filters. See the RFI 
> tutorial on my website for photos of some filters and a discussion 
> of how they work. 
> http://audiosystemsgroup.com/RFI-Ham.pdf
> 73,
> Jim Brown K9YC
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Thanks! & 73, doc, KD4E
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