Cooling; Cooling Diagram - Kenwood TS-480 User Manual

Cooling

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In developing the TS-480HX, the most important issue when it came to structural design was how
to arrange for sufficient cooling.
In order for this transceiver to be capable of 200W output and yet have the same compact design
as the TS-50, we examined dozens of different cooling fans, various circuit board patterns, and a
variety of different cooling fan layouts. After conducting several hundred different types of heat
dissipation tests, we finally decided on the present structural design of the TS-480.
The principle features of this structure are as follows:
Improved cooling efficiency as a result of employing twin cooling fans;
Concentration of efficient cooling fins in one location since space limitations meant that a normal
fin arrangement was not possible.
Fig. 26 illustrates how the TS-480 is cooled. The air that is sucked in through the front panel and
the top and bottom of the case directly cools the surface of those internal components that are
generating heat, such as the final section. At the same time, it absorbs the heat that has dispersed
through the die-cast chassis before being expelled by the twin cooling fans at the rear.
Blue: Die-cast aluminum chassis
Brown: Circuit boards
As you can tell from this diagram, the cooling fans located at the rear must be powerful enough to
be able to suck in fresh air through the intakes on the front panel. In order to make the TS-480 as
compact as possible the mounting density of the internal components has been increased; for this
reason, we decided to install a pair of powerful cooling fans so as to ensure a strong flow of air and
the increased cooling efficiency that would result.
Fig. 26: Cooling diagram
Red: Heat flow from final transistors
Gray: Air flow (from front panel on left)
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