FYI: TX-1 Temp Study

[Peter A Markavage]

I've been running DC fans in my Apache for years. The fan sits on top of
the existing final compartment. I saw no reason to drill extra large
ventilating holes for it. Been that way since the 70's. Also, installed a
"suck out" DC fan over the modulator section. I think I fabricated a set
of brackets and attached them to the panel behind the dial drum. This fan
helps pull the heat out generated by the tubes not in the final cage. I
used 24 volt DC fans ($1 each at a flea market) and run them at about 19
volts. Both run quiet. If you have 12 volt fans, run them at about 9 or
10 volts to keep the noise down. I went with DC fans because I disliked
running 110/120 AC wires on the top or exposed side of the rig.

Pete, wa2cwa


On Tue, 03 Jul 2007 12:14:15 -0400 "Charles W. Morehouse"
<w4gbw at bellsouth.net> writes:
Folks,
Am in the process of restoring my Apache, and yes it does run too hot. 
Being a purist, I hate to drill extra holes but it must be done.
First I plan to install a muffin fan, blowing up, under the top lid. 
Will enlarge the holes slightly in the fan area.  Got to repaint anyway.
Will install an 80 mm fan on the final cage sucking out. A copper screen
over the hole will keep the RF in.  Was thinking of musing
thermostatically controlled 12 v
fans to keep the noise down.  Antec makes some nice ball bearing fans.  A
voltage doubler and regulator on the 6.3 vac will supply the 12 vdc.
Was thinking of an 80 mm fan also on the final cage of the Warrier.  Any
better suggestions?  Has anyone had experience with the brush less dc
fans in an RF environment.
Maybe should stick with 110 vac fans?  That way would not have to install
the 12 vdc supply.
Wayne,
W4GBW



Peter A Markavage wrote: 
Wouldn't you want "more air flow up" rather then "more air flow down"?
You want to suck the hot air out of the final compartment rather then
circulating it around the inside of the final cage, especially since most
of the side walls do not permit easy air flow "down and out".

Pete, wa2cwa

On Mon, 2 Jul 2007 12:39:16 -0700 Michael Waldrop <w5rkl at YAHOO.COM>
writes:
  
The larger muffin fan covers 95% of the final cage's top, providing
a lot more air flow down into the final cage than the original fan
every could. There is approximately 1/4 to 1/2" of clearance 
between
the top of the fan and top lip of the cabinet. I suspect this 
clearance
will be the same with the Apache.


73's
Mike
W5RKL

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