The upgrade improves the overall stability of the design. Most KPA100s are FB as is, but variations in how some KPA100s were built (particularly the exact position of RFC10 at the antenna connector at the output) and apparently some situations where normal parts tolerances added up all in one "direction" caused a few amplifiers to exhibit instability on one or more bands under various conditions.
It's a straightforward and easy upgrade to do. If you have any question at all about your KPA100's performance, I recommend doing it. It's good that you have the shield upgrade installed. That is important to do as well. Ron AC7AC -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Tindle Sent: Monday, January 01, 2007 5:14 AM To: [email protected] Subject: [Elecraft] Upgrade for KPA100 I have been hors de combat for a year or two, notice that there is now an upgrade kit for KPA100, I have early KPA100 but have upgraded shield and I think put a resistor across an rfc. Have a feeling that there is some instability on 80 metres? What is the upgrade kit supposed to remedy or correct please?? 73 John GW3JXN _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
