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[TenTec] Fw: [Ten-Tec516] Re: Argonaut Fan ...

To: <tentec@contesting.com>
Subject: [TenTec] Fw: [Ten-Tec516] Re: Argonaut Fan ...
From: w9ac@arrl.net (Paul Christensen)
Date: Tue Feb 11 21:12:02 2003
FYI - This from the Argo V Mail Reflector. 

The epilogue is that wiring the Argo's two whisper fans electrically *in 
series* at the Molex power connector provide ample cooling and much less fan 
noise.

-Paul, W9AC

----- Original Message ----- 
To: Ten-Tec516@yahoogroups.com 
Sent: Tuesday, February 11, 2003 21:03 PM
Subject: [Ten-Tec516] Re: Argonaut Fan ...


Hi Paul,

Yes, I too thought that placing the fans in series might do the 
trick. Your post gave me the nudge to try it.  Last night, I mounted 
them and temporarily wired them in series directly to the 937 power 
supply.  They run >much< slower, are very quiet and pull about
60 mA.
   
As a cooling test, I ran 20 watts CW into a dummy load for 6 minutes 
in my ~72 degrees F living room.   After about 3 or 4 minutes, I 
could just begin to tell part of the heat sink was getting warmer 
than the rest of the radio.  At 6 minutes,  the heat sink was 
definitely warm, but only at the inboard end of the sink up against 
the back wall of the radio.  The rest of the sink felt to be at the 
same temperature as the radio case.  This compared to the heat sink 
on the power supply: it was too hot to touch.    

So even in series the fans provide ample cooling for the radio.

Thanks for the suggestion,
Wayne
KR4N


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