Bruce, That is a bit of a mystery. I just checked a newly built K2/100 and could find no instance of any response at all with no antenna connected.
There are no oscillators switched in and out when the KPA100 is active - both oscillators in the KPA100 run whether the KPA100 is in-line or not. Have you grounded the crystal cases? Try varying the 4 MHz oscillator capacitor and see if the frequency shifts. If so, ground the crystal case near the bottom to see if that takes care of it - I am speculating that some of the oscillator energy could be picked up by the T/R switch when the KPA100 is in-line. The only thing that changes between PA on and off (or with power above/below 11 watts) is that the receive signal path flows through the T/R switch instead of through the straight-thru path from relay K1 to K2. You might want to check all the components in the T/R switch for proper value, diode orientation, and good soldering. The components associated with the T/R switch are shown in the schematic at the top of sheet 2. 73, Don W3FPR On 1/29/2011 10:02 AM, K1FFX wrote: > Additional info: > > The "birdie" also goes away when the power setting is clicked below > 11 watts. > > - Bruce > ______________________________________________________________ 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
