[Drake] Cooling fans - blow in or out?

[Tim Kass]

I have done mine several ways with both the T4X and
the TR-4C rigs, placed 5 inch fans on top, using
rubber washers as a buffer between the fan and cage
top, then either used insulated bell wired to tie it
off or small plastic cable ties, so no mods necessary,
also placed a small spst toggle switch in the upper
corner of the mounting hole on the fan, need to drill
it out just a bit to turn the fan on/off - also used a
220 volt fan so it doesnt make so much noise.  

On some of the T4X's I have I placed the 3 inch fan on
the back using similar technics so I can stack the R4B
on top of the transmitter if I wanted to...

Always blowing out....

73, Tim
K8WBL





--- Jamesnf at aol.com wrote:

> Chris:
> 
> I cool my T4X-C by placing a small muffin fan on the
> top of the cabinet over 
> the tubes pulling air out.  I glued some soft gasket
> material to the edges of 
> the fan and simply sit it on the cabinet, not
> attached by hardware.  
> 
> My thoughts on doing it this way....... Drake
> designed the transmitter to 
> cool via convection.  Warm air rises and passes
> through the roles in the top of 
> the cabinet and is replaced by cooler air entering
> through the side and bottom 
> holes.  I just wanted to enhance this process, so I
> gently (and quietly) pull 
> air out.  Another advantage is that the warm air
> leaves upward and out from 
> one spot.  If you blew air into the cabinet, warm
> air might leave from the 
> sides, the bottom, the edges of the top, etc.  It
> might even blow onto the 
> neighboring R4-C through the side holes.......don't
> want to do that!   
> 
> The cabinet is noticeably cooler with the fan than
> without it. It was a 
> quick, cheap and simple project that seems to work. 
> My favorite kind!
> 
> Jim W9TN
>
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