Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Peter -
I haven't, but I can tell you that the cabinet top of the T-4X(any) can
be too hot to comfortably hold you hand on it after extended
transmission, especially on high duty cycle modes such as RTTY and AM.
Even on CW or SSB this area can get quite warm. Of course this is even
more evident with the TR-3/4 series with 50% more dissipation in only a
slightly larger cage.
On the other hand, with a small, silent fan exhausting air out the back
of the PA cage the cabinet top is only slightly warmer than the rest of
the cabinet, even after long transmissions. The fan really makes a big
difference in that area, and in the rest of the cabinet as well.
73, Garey - K4OAH
St Charles, IL
Peter Bent wrote:
"Peter Bent" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Just curious, has anyone actually measured the temps in the cages-- before
and after?
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Ron Wagner
Sent: Monday, December 24, 2007 8:18 PM
To: [EMAIL PROTECTED]
Subject: Re: [drakelist] Cooling Fan on finals
Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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The way I went about his was a half wave (single diode) and filter cap
from the 12VAC filament line. I drive a 24 volt fan drawing air out of
the final cage. Turns the fan on as I turn on the rig, shuts down when
turned off. Runs slow and quit, but really makes a difference on the
temp of the final cage. I attach the fan to the rear of the cage (so the
cabinet comes off without problems) with grommets and black nylon wire
ties. This arrangement does not seem to damage the cabinet, and does a
nice job cooling.
As far as stability, as long as you do not blow the warm air in, it should
make the rig more stable. The cabinet and associated circuits should
stay much more constant in temperature. In a good oscillator design,
which Drake has, it is typically temperature change that causes the drift.
73,
Ron WD8SBB
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