On 5/18/20 10:19 AM, Joseph Gwinn wrote:
On Mon, 18 May 2020 12:00:02 -0400, time-nuts-requ...@lists.febo.com
wrote:
Re: time-nuts Digest, Vol 190, Issue 30
Message: 1
Date: Sun, 17 May 2020 12:53:42 -0600
From: Eric Scace <e...@scace.org>
To: Time Nuts email list <time-nuts@lists.febo.com>
Subject: [time-nuts] potential low-RFI power supply
Message-ID: <c1ddf9af-78d7-4df1-876b-4fae5f398...@scace.org>
Content-Type: text/plain; charset=utf-8
Pro Audio Engineering announced a sale (through Friday) on its
nominal 14 Vdc 4A switching supply
<https://proaudioeng.com/products/pae-kx33-low-rfi-ac-power-supply/>.
The test results
<https://proaudioeng.com/products/pae-kx33-low-rfi-ac-power-supply/>
webpage compares noise on the DC output and noise frequency spectrum
under a variety of conditions with a lead-acid battery, an Astron
linear supply, and a variety of switching supplies from other
manufacturers.
I have not used this and can?t vouch for its performance. Given
recent discussions here on supplies, the analysis might be
interesting. At least the supplier has attempted to quantify the
performance of its power supply and make that information available
to the prospective purchaser.
It would be interesting to see comparable (or more suitable)
measurements made by others posted here.
Given that this power supply is intended for audio applications such as
mixer boards, if the switching frequency exceeds say 200 KHz, none of
the ripple spurs will matter, as they are far above the band. Hmm.
Unless that get too close to the sampling rate of some delta-sigma
converter I suppose.
Actually, it's intended as a power supply for HF transceivers, so noise
in the HF band is of interest. Especially if it's radiated from the
power cable.
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