The K3 and K3S have built in transmit and receive bandpass filters. Unfortunately their performance data is unpublished.
http://elecraft.com/manual/K3_Schematics_Jun_2010.pdf See the third page David hasn't shared what the specific circumstances may have caused the HI SIGNAL response. That may give a clue as to the nature of the fault. 73 Frank W3LPL ----- Original Message ----- From: [email protected] To: "Elecraft Reflector" <[email protected]> Sent: Sunday, June 24, 2018 3:53:13 PM Subject: [Elecraft] K3S HI SIGNAL Did you use bandpass filters? John KK9A aj4tf wrote: K3S 10669 suddenly stopped receiving during Field day and displayed HI SIGNAL, even with nothing connected to the antenna. Performed an EE INIT without any effect. Sluggish response to the front panel controls. Any advice? David AJ4TF ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]

