8411 MECHANICAL STRUCTURETo let users gain an understanding of the excellent cooling performance of the TS-890S, we will introduce below thetemperature increase data of a continuous transmission test that was conducted at 100 W under a temperature of 30°C.Fig. 86 Continuous Transmission testFrom the graph above, when transmission continues for 2 hours or longer at an output power of 100 W under atemperature of 30°C, the TS-890S continues to function properly when the temperature of the FET on the final unit wasabout 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 thesituation.
