[Elecraft] OT: fan control in MFJ-4225MV switching P/S

[Alan Bloom]

Yes, I expect a voltage regulator would work better than a resistor to
drop the voltage.  Since the fan motor draws more current at startup
than when it is running, a contant-voltage source should give
more-reliable startup at a lower voltage.

But you probably still want to use a thermostat or some other method to
switch the fan to full voltage if things get too hot.

Al N1AL


On Tue, 2008-08-05 at 05:06, Kenneth A. Christiansen wrote:
> I used a 5 volt regulator on my MFJ 4225 to slow down the fan. This allows
> the fan to start reliably at any voltage. I have run mine and my K2-100 this
> way for at least 5 years with no problem on SSB, CW and DIGITAL.
> 
> 73
> Ken W0CZ
> 
> Bill 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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