Recently I spent time at work looking for a PS to use inside an EMI
chamber. None of the ones on hand (nclude some older Sorensons) were
RF-quiet. Just because a PS is "linear" does not make it clean; many such
use SCR PWM pre-regulators that are quite dirty. That said, an EMI test
chamber is much more demanding than many other uses to which a power supply
might be put.
> [Original Message]
> From: Tim Groat <email@example.com>
> To: <firstname.lastname@example.org>
> Date: 4/7/2007 4:29:42 PM
> Subject: Re: [RFI] Sorenson DCS 55-55 PS Clean?
> You can read the manual here:
> <http://theelectrostore.com/datasheets/dcs55-55_nig.pdf> (warning: long
> file!). On page 4, it says the power supply is certified to meet FCC
> "A" emissions. In other words, it's going to make more RF noise than a
> class "B" product, at least at some frequencies. If it passed class "B"
> standards, they would almost certainly say so because that opens
> sales opportunities.
> Also take a look at the safety information on page 2. Among other things,
> this unit needs a dedicated 208-240V AC power line similar to what you'd
> need for a legal-limit power amplifier. That's to be expected, since this
> *is* a 2.5kW power supply.
> So I won't say don't use it--Sorenson is a respected company that make
> industrial products. But do understand what you're getting into. Powering
> an amateur radio transceiver isn't what they had in mind when they
> and built this heavy-duty brute.
> --Tim (KR0U)
> >kd4e <email@example.com>:
> >Anyone familiar with the Sorenson DCS 55-55 rack mount power supply?
> >Are they RFI clean?
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