The internal band-pass filters are very narrowbanded and very high Q. I believe John was referring to external band-pass filters of the type used in multi-transmitter stations that may be operating at high power into antennas in each other’s near-fields.
The K3S and K3 can survive a lot of abuse of this type; it includes built-in signal detection and shut-down of various RX stages. But pumping many watts into the front end (due to tight antenna coupling) is never a good idea. 73, Wayne N6KR > On Jun 24, 2018, at 4:10 PM, [email protected] wrote: > > 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 Unfortunately their performance data is unpublished.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] ______________________________________________________________ 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]
