[time-nuts] potential low-RFI power supply

[jimlux]

On 5/18/20 11:27 AM, Taka Kamiya via time-nuts wrote:
> I bought one the moment information about this PS was posted here.
> 
> Will you gentlemen come up with a testing method?  I have an audio FFT, spectrum analyzer up to 26.5GHz, O'scope of various kind, measuring receiver, frequency counters, 6 1/2 DMM and other assorted stuff to play with.  I, however, lack the experience and technique most of folks here have.
> I'll be glad to run any test and post a result.

Ed Breya had a pretty comprehensive list.

What I would start with is getting some big resistors to serve as a load.


> ---------------------------------------
> (Mr.) Taka Kamiya
> KB4EMF / ex JF2DKG
>   
> 
>      On Monday, May 18, 2020, 1:49:04 PM EDT, jimlux <jimlux at earthlink.net> wrote:
>   
>   On 5/18/20 10:19 AM, Joseph Gwinn wrote:
>> On Mon, 18 May 2020 12:00:02 -0400, time-nuts-request at 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 <eric at scace.org>
>>> To: Time Nuts email list <time-nuts at lists.febo.com>
>>> Subject: [time-nuts] potential low-RFI power supply
>>> Message-ID: <C1DDF9AF-78D7-4DF1-876B-4FAE5F398D65 at 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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