[Elecraft] K3 SUB RX question

I am in need of advice please.. I want to use an OCF non-resonant dipole through the K3ATU to the SUB RX and use a vertical for the MAIN RX antenna for diversity reception. Then I want the SUB RX to mute in transmit mode while transmitting on the vertical. Is this possible? How do I

[Elecraft] K3 sensitivity below 40 meters

Conventional wisdom historically has been that a receiver preamp is not used at 40 meters and below primarily because it is not needed, indeed it would typically degrade receiver performance. So why is it necessary to engage the 20 dB preamp on the K3 to get it to hear an S9 signal at the

[Elecraft] K2/100 and Ten Tec Titan

Talk about QRP sacrilege .. I moved the OMNI 6+ out of the way and connected the K2/100 to the Titan 425 amp. No RF feedback, no thumps, no instabilities; just a little flicker of the room lights and 1500 watts of rock solid QSK RF. Whens the next contest?

[Elecraft] filter alignment question

I recently acquired K2 #1084 from a friend. I upgraded the radio to Rev. B, added the DSP module and am about half way through the KPA100. As I was aligning the filters I noticed something unexpected. Everything seems to be fine except that as I scroll through the CW XFIL filters, the tone of