[Drake] Cooling fans - blow in or out?

[Paul Manno]

Folks,

One way I've been happy "attaching" fans to my TR-4C and similar Drake 
line is using inexpensive nylon computer motherboard mounting standoffs.  
The threaded end just fits in the existing cover holes and the other end 
into the fan holes.  Secure, non-marking and convenient to remove when 
needed.  Check your local computer stores for a supply.

My fans blow air out of the cabinet. The 80mm 12vdc fans are powered by 
one of those 9vdc wall-wart power supplies that accumulate in the shack 
providing plenty of cooling and very low noise.

73,
Paul
KG4UVU

On Sun, 13 Feb 2005, Garey Barrell wrote:

> Chris -
> 
> For a piece of equipment that is NOT  _designed_  to be forced air 
> cooled, the most effective cooling is done by having the fan blow OUT, 
> or better still UP to  _aid_  in getting warm air away from the 
> immediate area.  A fan mounted on the back of the final cage of a Drake 
> transmitter will keep it cool, and greatly extend the life of the final 
> tubes and associated components.
> 
> 73, Garey - K4OAH
> Atlanta
> 
> Drake C-Line Service Manual
> <http://hr99.home.mindspring.com/R-4C_Servicez/>
> 
> 
> 
> Chris Codella, W2PA wrote:
> 
> > I'm about to install a cooling fan on my T-4XB and TR-4, having seen 
> > many ways to do it.  But what's the concensus on the list about 
> > blow-in vs. blow-out?  I've seen it recommended both ways.
> >
> > The only recommendation I saw that also included a rationale was one 
> > posting where someone said to orient the fan blowing out because the 
> > only time one wants to blow in is if there is a forced-air handling 
> > design built in, as exists in many amplifiers (i.e. chimneys, etc.).  
> > I must say that most rigs I see with factory mounted fans on the back 
> > that also don't have air handling features inside, do in fact blow 
> > out, not in.
> >
> > What's the concensus among the Drake crowd here?  Please don't 
> > recommend one way or the other without giving a reason.
> >
> > Thanks!
> > 73, Chris, W2PA
> >
> >
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