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 got all needed parts for a replacement in a mod-package from
Elecraft. Coming with it were two C's to replace in the 12m LPF. I
replaced them in the same go.
Now all is well!
73
Arie PA3A
Johnny Siu schreef op 10-6-2015 om 0:46:
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 <h3c...@gmail.com>
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 KPA-500, serial # 0698, solid state linear amplifier, covers 160-6 meters.
Factory upgraded w/ T/R circuit plus 12-meter low pass filter mod on June 1,
2015.
Amplifier "meets or exceeds all factory specifications."
$1750 shipped CONUS. Please contact direct: h3c...@gmail.com
Cary, K4TM
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