Kenwood TS-480 manual Temperature rise around final transistors

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Now let’s have a look at the rise in temperature of the different parts when the TS-480HX transmits continuously (14MHz) for 30 minutes at 200W. To provide a comparison, plotted on the same graph is test data compiled for a compact 100W model (designed so as not to power-down during continuous transmission at 100W).

Fig. 30: Temperature rise around final transistors

Fig. 31: Temperature rise of die-cast aluminum chassis around GND terminal on rear

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Contents Page TS-480HX TS-480SAT Determination to create a unique transceiver Design ObjectivesBack to basics The appeal of HF lies in DX’ing Focus on basic performance Standalone control panel200W challenge Adding appeal to fixed station operations Overview of the TS-480 SeriesTS-480 concept began with development of the TS-570? Development Objectives for the TS-480 SeriesAchieving 200W output in a compact transceiver Focusing on HF Circuitry TX circuits 200W final sectionTX IMD output 200W SPS separate power sources TS-480HX only SPS schematic diagram100W final section Failsafe device some TS-480HX versions onlyAntenna tuner TS-480SAT 200W final section FM modulation block diagram FM circuitRX circuitry Front end RX 1st mixerRX dynamic range RX sensitivity Jumpers for joy Circuitry after the roofing filter Comparison of optional CW filters 500HzOption installation unit Auxiliary Features Features useful for 50MHz operationsFeatures useful for mobile operations Full compatibility with digital modes data modesNew 5MHz band DSP circuit Features of the Built-in DSPIdeal for mobile operations DNL Noise reduction Demonstrates how ignition noise is reduced by the DNLNR OFF Beat cancel BC OFFRX DSP filters Switching Width During CW operations RX equalizer & TX equalizer CW auto tuneTips TS-480 menusDSP Useful if you want to go on to tune FSK APO Functions that can be assigned to PF keys Assigned Use Split Making menus easier to use Menu switching Quick menuStructural Features Internal structure of the main unitCooling diagram CoolingUpper side Temperature rise around final transistors Page Design concept Constant recording function New Option Voice Guide & Storage Unit VGS-1Message recording/playback function Reset Configuration mode for TX output, etcMenu settings Split mode Voice GuideOther features VFO mode, direct frequency entryMemory channel Variable Voice Guide speedKNS added Main functionsButton layout & basic operation Changing memory and registered details CW keyingCompatibility with KNS Kenwood Network Command System Reading and writing filesSetting up KNS on the Arcp side Accidental continuous TXPage Using a broadband router Checking LAN settings New Option ARHP-10 Amateur Radio Host Program FreewareAdjust PC volume User setupPage Troubleshooting Network & Operations Problem SolutionCannot get KNS to work Sound Problem Solution Connect a microphone to the computer and bring up TS-480 In-Depth Manual