That's a pretty good solution. When I was making measurements I noted
that when I turned the supply voltage down to the 10 to 11 volt range
the fan got very quiet. In fact, I was going to forget about the
thermostatic control solution. But when I put the cover on, the noise
worsened quite a bit at the same voltage. Pulling air through those
case perforations seems to do it.
Since the K3 is spec'd for 11 to 15 volts, I wanted to run at a little
over 14 V or so. The fan really gets noisier as voltage climbs, so I
definitely needed either the resistor solution or fan control.
73-
Nick, WA5BDU
NZ0T wrote:
As I'm not a very technical person I just used a couple of resistors in
parallel to slow the fan down in my 4225. I can't remember the values this
early in the morning but it seems to be working just fine. The supply does
run a little warmer but not hot and the fan is no longer heard.
Bill NZ0T
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