Should contest rules allow and act upon 599K QRM reports?

Friday, 21 May 2010

Elecraft K3 ERR 12V

I was in the middle of the RSGB 80m club championship cw leg yesterday when the K3 suddenly displayed the above error message "ERR 12V". The KPA3 module (100w PA) went into bypass mode and the radio went into QRP mode and the fans came on at level 2. The power control would not adjust past 12W. I switched the K3 off and on again and it allowed me to set the power above 12w, however when I touched the key the K3 displayed the same error message and conditions.

I did a quick google search and came up with reports of this error message from many K3 users. One report suggested that it would be the pcb connection fingers between the RF board KPAIO3 board or between the KPAIO3 board and the KPA3 board (2 sets of connection fingers create a three board sandwich (RF board/KPAIO3 board/KPA3). The user suggested that a slight oxidisation of the pins can occur and cause high resistance on the 12V line. I took the top off, removed the KPA3, removed the KPAIO3 and examined all parts of the sandwich. I cleaned the pins and re-assembled the sandwich (as did the other user). To my surprise everything now behaves as normal.

When I think about it, this design is pretty flawed. You just have to look at the main pwr lead connections to RF board and then look at the poultry size of these connection fingers (2 connecting sets!) to the KPA3 PA unit which draws the highest current in the radio. What were they thinking about?

Hopefully this blog will help others when the inevitable happens.

26 comments:

Anja021netteC_021Restrepo1 said...

凡是遇到困擾的問題,不要把它當作可怕的,討厭的,無奈的遭遇,而要把它當作歷練、訓練和幫助。.............................................

茂慧 said...
This comment has been removed by a blog administrator.
政儒 said...

A stitch in time saves nine...................................................

正玲正玲 said...

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hernande said...

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It is no use crying over spilt milk..................................................................

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Quality is better than quantity..................................................................                           

郁雨郁雨 said...

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貴寶 said...

It takes all kinds to make a world.............................................................

吳婷婷 said...

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石薇 said...

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人生最可憐的是半途而廢,最可悲的是喪失信心,最遺憾的是浪費時間,最可怕的是沒有恆心。..................................................

誠李行王wtf桂屏李edt李 said...

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宛真宛真 said...

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溫緯李娟王季 said...

rain before seven; fine before eleven.............................................................

家榮家榮 said...

相見亦無事,不來常思君.................................................................

琬安琬安 said...

Prevention is better than cure...................................................

蔡宗新蔡宗新 said...

成熟,就是有能力適應生活中的模糊。............................................................

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家唐銘 said...

缺少智慧,就是缺少一切..................................................

沈貞李添睿儀 said...

人自幼就應該通過完美的教育,去建立一種好的習慣。......................................................

蕙陳春宗陳穎 said...

人不能像動物一樣活著,而應該追求知識和美德............................................................

冠陳儒 said...

用心經營的blog~您的部落格文章真棒!!..................................................................

惠邱邱邱邱雯 said...

認清問題就等於已經解決了一半的問題。..................................................