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Categories | Power Supplies | Amperor APP 300 25 Amp DC power supply Help

Show all reviews of the Amperor APP 300 25 Amp DC power supply

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G8JNJ  Rating: 4/5 Apr 26, 2010 08:00  Send this review to a friend!
Works fine for the price - RF noise can be reduced  Time owned: 6 to 12 months
I have one of these which I use with an HF transceiver.

There is a small amount of radiated RF noise which can be considerably reduced with a quick modification.

Drill a small hole near the DC 0v terminal. Fit a nut, bolt, star washer and solder tag and connect a short wire between the tag and 0V terminal.

Connect a 0.1uF capacitor (ideally ceramic) with as short a set of leads as possible across the DC output terminals. Another 0.1uF between the +ve and chassis connection may also help slightly.

Wind the DC output cable a few times through a suitable size ferrite ring. I'd also do this with the mains supply cable. In both cases, wind the cable as close to the supply as possible.

These modifications reduce the radiated emissions by at least 10dB.

Martin - G8JNJ
Product is in production.
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