Kenwood TS-890S In-Depth Manual page 88

11 MECHANICAL STRUCTURE
To let users gain an understanding of the excellent cooling performance of the TS-890S, we will introduce below the
temperature increase data of a continuous transmission test that was conducted at 100 W under a temperature of 30°C.
Fig. 86 Continuous Transmission test
From the graph above, when transmission continues for 2 hours or longer at an output power of 100 W under a
temperature of 30°C, the TS-890S continues to function properly when the temperature of the FET on the final unit was
about 65°C. From this, we can tell that there is no power down (activation of protection) due to insufficient cooling.
Although the TS-890S adopts a heavy-duty design, the life of electronic parts in general (not just KENWOOD products)
tends to shorten when the temperature is higher.
To enable long-term use of the TS-890S, it is recommended that it be used at an appropriate output according to the
situation.
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