subject:"\[Elecraft\] KPA\-500 modifications"

[Elecraft] KPA-500 modifications

2015-06-09 Thread Johnny Siu

Does anyone have the any idea about the 'Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod' mentioned in the advert. below? 73 Johnny VR2XMC 寄件人︰ H. Cary 收件人︰ elecraft@mailman.qth.net 傳送日期︰ 2015年06月10日 (週三) 4:15 AM 主題︰ [Elecraft] KPA-500 FOR SALE For Sale: Elecraft

[Elecraft] KPA-500 modifications

2015-06-10 Thread Johnny Siu

Thanks Arie. 寄件人︰ Arie Kleingeld PA3A 收件人︰ elecraft@mailman.qth.net; Johnny Siu 傳送日期︰ 2015年06月10日 (週三) 3:54 PM 主題︰ Re: [Elecraft] KPA-500 modifications Johnny, I have done that mod. Reason was that my KPA500 had high SWR at the input and barely any gain. Tracked the problem down

Re: [Elecraft] KPA-500 modifications

2015-06-10 Thread Arie Kleingeld PA3A

Johnny, I have done that mod. Reason was that my KPA500 had high SWR at the input and barely any gain. Tracked the problem down to the TR circuit. One of the switching Fet's (that switch the TR PIN-diodes) had died. It proved to be an error that happened before, because for a lousy 12 bucks I