Hi If the K2 will work properly with the KPA100 removed and the DC voltage is back on the VRFDET line then you may have a bad U6 in the KPA100. This IC is a tristate op amp and if bad will load down the VRFDET line. I have found several of these IC's bad with the symptoms you are describing. The IC can be zapped if a greater than 5 volt signal is applied to the VRFDET line. This could be caused by a miswired 9 pin D RS232 or data connector or by static discharge. It may be a good idea to add a couple of diode clamps to the VRFDET line on the KPA100 to protect this IC. Maybe Wayne should give us some direction here.
Don Brown (the other Don) KD5NDB ----- Original Message ----- From: J F<mailto:[EMAIL PROTECTED]> To: [email protected]<mailto:[email protected]> Sent: Saturday, July 31, 2004 5:50 AM Subject: [Elecraft] K2 RF Detector I've moved along, (thanks Don) with my problem. It looks like I have a RF voltage at the input of R67 (1.5K 1%) but nothing on the other side. No DC voltage at D9. What should I be seeing in this area. I was set for 2 watts or a bit less... Thanks, Julius _______________________________________________ Elecraft mailing list Post to: [email protected]<mailto:[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<http://mailman.qth.net/mailman/listinfo/elecraft> Help: http://mailman.qth.net/subscribers.htm<http://mailman.qth.net/subscribershtm> Elecraft web page: http://www.elecraft.com<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
