[TenTec] Switching Power Supplies

[Dr. Gerald N. Johnson]

Some switchers ARE noisy. Some are NOISY! MFJ switchers made 
specifically for radio use tend to be quiet. Its worth scouring the QST 
reviews of switchers to see the differences.

There are reports that the switcher inside the Yaesu FT-736 adds noise, 
I'm pretty sure it adds noise on the power line to make X-10 power line 
remotes work poorly and to sometimes trigger the X-10 receivers.

73, Jerry, K0CQ

On 3/15/2010 9:36 AM, John Ferrell wrote:
> I keep hearing that switchers are noisy. I think that is an outdated rumor.
> I have had an MFJ-4245 switcher for about ten years now. I have never
> encountered any noise with my Pegasus or the Jupiter that followed it. I run
> the whole station from it with no problems. It is light enough to hold out
> at arm's length with one hand.
>
> I have never loaded it beyond about 20 amps though.
> John Ferrell  W8CCW
>