[Elecraft] RS-20M vrs RS-35M vrs MFJ-4225

Sat Dec 6 13:03:00 2003

For those who are ARRL members, recently QST had an excellent review on
power supplies from different manufacturers..

-rob N7QT

----- Original Message ----- 
From: "Donnie Garrett" <[email protected]>
To: "Elecraft" <[email protected]>
Sent: Saturday, December 06, 2003 9:25 AM
Subject: [Elecraft] RS-20M vrs RS-35M vrs MFJ-4225

> Over the past 10+  years I have owned 3 different RS-20M supplies.  None
> of the RS-20's had and RF hash or transformer hum.  I have also owned 3
> different RS-35M supplies during this same period and all the RS-35's
> had core hum that was sometimes radiated through the metal cabinet.  In
> my opinion the RS-20 series is the best between the 2 supplies.  I also
> own a MFJ-4225 but the (FAN) noise in it is very objectionable! With the
> supply sitting on my desk it is only about 5 feet away from my ears and
> I can hear it.  I don't like listing to power supply or rig fan noise.
> FYI: The fan runs all the time in the MFJ-4225.  Actually the fan in the
> MFJ-4225 is really not the culprit, its the fact that the fan it's
> trying to pull air is as well as exhaust air through the very small
> cabinet holes.
>
>
>                                        Don / WA9TGT
>
>
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