[RFI] Anyone know if this 12v ps is RFI-clean?

[Cortland Richmond]

I am having to replace a 50V 20 amp Ameritron unregulated supply with
something better regulated. I got a fairly cheap 48 V 22 amp switcher --
but knowing what they're like, I also "won" "buy it now" a lab bench 25 Amp
50V lab PS that due to age is almost certainly linear  -- and it weighs 80
lbs. That's still no guarantee; some of the Sorenson's were SCR regulated
on the front end, for all they weren't switchers, and those are noisy.

FWIW, Ameritron sells a purpose-built 50V switcher for its ALS-600
amplifier. For $700 . 

They and MFJ (who bought Ameritron) also sell a 75 Amp 13.6V supply for the
ALS-500M amplifier. It's $360.


Cortland
KA5S


> [Original Message]
> From: Dale Svetanoff <svetanoff at earthlink.net>
>
>
>... For truly "clean" power, get a "hernia-maker" - meaning a linear power
> supply, not a switcher.  You only have to worry about 60 or 120 Hz hum and
> ripple with those.  If you don't want big iron like that, then stick with
> the select group of switchers that are designed for communications
> applications.  Those units will exceed performance of FCC Class B
equipment
> by controlling both the radiated and conducted emissions.  Yes, you will
> pay more, but you get what you pay for.  
>
> If you watch closely, there are surplus equipment dealers (and people at
> hamfests) who sell off big linear power supplies very cheaply.  They were
> the norm 20 or 30 years ago, and you can probably get one for under $50. 
> You'll want to find it locally, however, as these babies usually weigh 40
> pounds or more when you start talking 50 amps (or greater) output
current. 
> Unless malfunctioning, they usually deliver clean power to the loads.
>
> 73, Dale
> WA9ENA