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WA2ISE > TECH 09.12.20 23:16l 4 Lines 608 Bytes #999 (0) @ WW
BID : 10803_AL0Y
Read: GUEST
Subj: Reducing RFI from a Samlex SEC1223 power supply
Path: IW8PGT<IZ3LSV<IK5FKA<IK5FKA<PE1RRR<K5DAT<AL0Y
Sent: 201209/2115Z 10803@AL0Y.#NNJ.NJ.USA.NOAM BPQ6.0.20
Reducing RFI from a Samlex SEC1223 switching power supply
This is a pretty good power supply, but it had RFI at various frequencies, like 320KHz, 640KHz and more. Measuring around S5 on my TS440SAT. Found on the 'net modifications like mine here which turned out to knock the RFI down a lot, around 15dB or more. The caps I used are poly films I got from the junk box, need not be identical, but this doesn't matter here. I did have to drill a small hole in the aluminum chassis cabinet above the output terminals for a screw and grounding lug for these caps. This makes this power supply very good now.
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