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<\/a><\/p>\n\u56de\u8def\u56f3\u3067\u306f\u3053\u306e\u8d64\u3044\u90e8\u5206\u3067\u3059\u3002<\/p>\n
\u3053\u3053\u306b\u4e0a\u306e\u8d64\u7dda\u306e\u3088\u3046\u306b\u30dc\u30bf\u30f3\u96fb\u6c60\u3092\u5165\u308c\u3066\u3042\u3052\u308c\u3070\u5185\u8535\u30d0\u30c3\u30c6\u30ea\u30fc\u306a\u3057\u3067\u6642\u9593\u304c\u4fdd\u6301\u3067\u304d\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u6a5f\u5668\u306b\u901a\u96fb\u3057\u3066\u3044\u308b\u6642\u306b\u30dc\u30bf\u30f3\u96fb\u6c60\u5074\u306b\u96fb\u6d41\u304c\u6d41\u308c\u306c\u3088\u3046\u306b\u30c0\u30a4\u30aa\u30fc\u30c9\u3092\u5165\u308c\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n KXIO2\u306e\u57fa\u677f\u3067\u306f\u3053\u306e\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002Ground\u306f\u3053\u3053\u3060\u3051\u3067\u306f\u306a\u304f\u3044\u308d\u3093\u306a\u3068\u3053\u308d\u304b\u3089\u53d6\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n \u30dc\u30bf\u30f3\u96fb\u6c60\u306f\u5165\u624b\u3057\u3084\u3059\u3044CR2032\u3092\u4f7f\u3044\u307e\u3057\u305f\u3002\u3053\u306e\u96fb\u6c60\u306e\u96fb\u5727\u306f3.3V\u3067\u3059\u306e\u3067\u9006\u6d41\u963b\u6b62\u306e\u30c0\u30a4\u30aa\u30fc\u30c9\u3092\u9806\u65b9\u5411\u306b\u5165\u308c\u308b\u3053\u3068\u3067\u3055\u3089\u306b\u9806\u65b9\u5411\u96fb\u5727\u964d\u4e0b\u30671V\u307b\u3069\u4e0b\u304c\u308a\u307e\u3059\u306e\u3067\u30012.3V\u7a0b\u5ea6\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3061\u3087\u3046\u3069\u3044\u3044\u3067\u3059\u3002\u30c0\u30a4\u30aa\u30fc\u30c9\u306f10\u5186\u304f\u3089\u3044\u306e\u3082\u306e\u3067\u5341\u5206\u3067\u3059\u3002\u79c1\u306fIN4148\u3092\u4f7f\u3044\u307e\u3057\u305f\u3002CR2032\u306e\u30d0\u30c3\u30c6\u30ea\u30fc\u30db\u30eb\u30c0\u30fc\u3082\u5fc5\u8981\u3067\u3059\u3002<\/p>\n \u3053\u3093\u306a\u611f\u3058\u3067\u53d6\u308a\u4ed8\u3051\u307e\u3059\u3002\u30ea\u30fc\u30c9\u7dda\u304c\u7126\u3052\u305f\u3088\u3046\u306a\u8272\u3092\u3057\u3066\u3044\u307e\u3059\u304c+\/-\u3092\u9593\u9055\u3048\u306c\u3088\u3046\u306b\u30de\u30b8\u30c3\u30af\u3067\u8272\u3092\u5857\u3063\u305f\u3082\u306e\u3067\u3059\u3002\u30c0\u30a4\u30aa\u30fc\u30c9\u306f\u71b1\u53ce\u7e2e\u30c1\u30e5\u30fc\u30d6\u306e\u4e2d\u306b\u5165\u308c\u3066\u3042\u308a\u307e\u3059\u3002<\/p>\n \u96fb\u6c60\u306f\u3053\u3093\u306a\u611f\u3058\u306e\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u306e\u5c0f\u3055\u306a\u888b\u306b\u5165\u308c\u3066\u3001KX2\u5185\u306e\u3069\u3053\u304b\u306e\u5c0e\u4f53\u90e8\u5206\u306b\u89e6\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n 2\u6642\u9593\u4ee5\u4e0a\u3001\u30d0\u30c3\u30c6\u30ea\u30fc\u63a5\u7d9a\u7121\u3057\u3067\u3082\u6642\u8a08\u304c\u6b63\u78ba\u306b\u6642\u523b\u3092\u4fdd\u6301\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n Notice<\/p>\n This article shows the modification that I made on my Elecraft KX2 to keep time clock without internal Li-Ion battery. If you use internal Li-Ion battery in KX2 this article is not in your interest. This resolution may be only applicable to my KX2 and KXIO2 option board then it is NOT the method that I guarantee the performance. Mod need to be done on your own risk.<\/p>\n —<\/p>\n At long last I got “wicked” Elecraft KX2 for my SOTA activation.\u00a0 Really pleased this light weight and high performance radio. My activation this year is surely going to heat up.<\/p>\n I applied optional KXIO2 Real Time Clock and Control Interface board.\u00a0 The main function of this option board is to show time clock on KX2 display and dry contact interface to peripheral equipment. This dry contact interface is not required for me but it is good to find the time clock on KX2 display to record in my log book and good to stop me radio operation at sometime, otherwise I must work until dusk \ud83d\ude42<\/p>\n This time clock function is designed for operation with internal Li-Ion battery. But my style of activation is longtime operation on summits and then I normally use external large sized battery. Then internal battery is removed from KX2 to reduce the weight to carry. But in this case the time clock is lost after removal of external battery and time clock last after approx. 2H. This temporary power backup by super capacitor on KXIO2 board is to keep time clock during the internal battery replacement and 2H is enough for the purpose.\u00a0 But I do need time clock keeping function to make me descent a mountain before darkness.<\/p>\n Of course it is useless to install internal Li-Ion battery just for clock, there should be the way to keep time clock by coin size Li-battery.<\/p>\n First I found super capacitor in KXIO2 circuit diagram and try to put Li battery. The voltage is 2.5V at super capacitor. This voltage was output from LM385 current regulator device.<\/p>\n The red marked battery and protection diode should work for backup.<\/p>\n The following points are +2.5V output and ground on actual KXIO2 board.<\/p>\n I use coin size battery CR2032 and its potential voltage is 3.3V little bit higher. Then protection diode works to drop the tension by its forward voltage drop approx. 1V, as well.\u00a0 This makes 2.3V and best for the time clock backup power.<\/p>\n I used IN4148 general use diode for protection and voltage dropper.<\/p>\n The following picture is after assemble and diode is inside of heat-shrinkable tube.<\/p>\n Also applied protection insulation by plastic, to avoid short circuits.<\/p>\n After this mod, time clock has been kept after 2H power off.<\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n
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