I find the fan noise on my MFJ-4125 unacceptable.
If I ever use it again it will have to be put behind the desk.
73,
Tony W7GO
ab2tc wrote:
Hello all,
I am using the MFJ-4125 25A switcher with my K3. I have no RF hash or
birdies from the power supply at all. I find it unbelievable that popular
and supposedly quality power supplies like the Astron would leave exposed
transistor cases at elevated voltage above ground. The MFJ fan, which is
always running, isn't whisper quiet, but not really noisy either. This
switcher faired very well in the ARRL review a few years back, in fact it
was one of the most quiet ones tested.
Knut - AB2TC
Mike Scott-7 wrote:
I also have an Astron RS35 and RS50 linear
supplies. Sometimes the magnetic hum from them drives me crazy. The
little
cork pads Astron puts in them to alleviate this
does not help much. I keep them under the closed console on the floor.
Mike WA8EBM
----- Original Message -----
I have my RS 35M on the floor also. I shorted it out once momentarily an
exciting moment. The problem is that the transistor cases that you see
sticking out of the back on the heat shield are at V+ level. If something
like a ground braid (this was my case) touches the transistors or the 12V
output terminal you have a short.
I ended up finding a cardboard box and cut the top and front off and most
of
the sides off. What is left is a cardboard "back shield" with lots of
ventilation to prevent accidental connections to the wire maze I have down
there on the floor.
Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
K3-100 #508/ KX1 #1311
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