I thought about one of these to keep my frequency standards powered during
power outages until I read the 5% 1-star reviews on Amazon:
https://www.amazon.com/product-reviews/B00429N19W/ref=acr_dp_hist_1?ie=UTF8&filterByStar=one_star&reviewerType=all_reviews#reviews-filter-bar
Wes N7WS
On Monday, June 12, 2023 at 03:18:26 PM MST, Jim Brown
<jim@audiosystemsgroup.com> wrote:
On 6/12/2023 12:50 PM, RVZ via RFI wrote:
> I'm wondering if there is a commercially made UPS (Uninterruptable Power
>Supply) that is RF quiet, or more RF quiet, than the average?
Yes, the CyberPower CP1500PFCLCD. I have five of them, first bought at
least ten years ago. In addition to being relatively quiet when in
standby mode, it has the MAJOR virtue of not overcharging the battery,
causing the battery to last a long time. Most UPS units DO overcharge
the battery, so you have to buy a replacement (from them, of course)
every year or two.
With ANY modern power supply, it's good practice to wind multiple turns
of the power cord through a big #31 clamp-on. Detailed advice in this
applications note.
http://k9yc.com/KillingReceiveNoise.pdf
and this slide deck.
http://k9yc.com/KillingRXNoiseVisalia.pdf
73, Jim K9YC
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