Re: Low Noise Power Supply
All, Chris Bartram.
On the subject of noise from a SMPSU – a long time ago I acquired a Farnell 75amp 28volt unit. Its located in my loft at the moment, and is also remotely turned on and off from the shack (long story as to why) As an experiment last night I connected about 40ft of wire to the + terminal and ran it round the loft. I could not detect, or see, any increase in noise on any band (IC-7300) 1.8 – 70MHz.
These PSU’s were obviously made to the enormous price they fetched when new. No doubt proper design and filtering.
I also have an Agilent E3648 Lab PSU in the shack, not sure if SM or Linear but full of digital stuff.... no interference from that either.
Chris, as I mentioned earlier, don’t buy a Nissei MS-1228 ‘Professional’ SMPSU..... outputs loads of crap on HF/Lo VHF. And personally I would not buy one of these ‘tweakable’ SMPSU’s to move sprogs away from the station you want to work. Had one of these at a club station.... awful !
Colin de G8LBS.
Sent from Mail for Windows 10
From: Brian Howie GM4DIJ
Sent: 18 February 2021 10:30
Subject: Re: [UKMicrowaves] Low Noise Power Supply
In message <9b0cfc04-b30d-faba-2395-3d5cba425a26@...>,