Re: Low Noise Power Supply

Colin Ranson

I bought from a SK a Nissei MS-1228 ‘Professional’ SMPSU 12v -max 28A.   Its ok for powering VHF/UHF amplifiers but puts out wandering birdies on HF.  The worst ‘Amateur service’ SMPSU I have ever come across was an ICOM PS-85 that came ‘free’ when I bought my IC-746 in 1998. My main interest was 6m then – when I plugged in the antenna on my new radio I was appalled at the amount of ‘noise’ on the band, my heart sank but I soon found out it was the PSU and invested in a linear supply.    I would not have the temerity to sell it to another amateur.



Best regards


Colin de G8LBS.


Sent from Mail for Windows 10


From: Mike Willis
Sent: 17 February 2021 16:03
Subject: Re: [UKMicrowaves] Low Noise Power Supply


The older (with real meter) version of the Nissai from ML&S is OK. The new one radiates QRM. But I know you like to save money so why not one of the HP ex bitcoinmining supplies? Should be under £20 for 12V 60A. They are not so noisy and can be turned up to 13.8V if you want

Mike G0MJW


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