[Elecraft] K4 QSK

[Rick Tavan]

I've had a chance to try the latest improvements to QSK on the field test
K4. It's great, close to the theoretical optimum of sounding like a code
practice oscillator running in the background!  Remarkably, it sounds the
same in TEST mode as when transmitting 100W barefoot, 1200W (ICOM 1000
vacuum relay),  or 1500W (KPA1500 PIN diode), internal keyer or external
WinKey emulator. No, it's not perfect. I don't hear much received signal
between dits at 50 WPM, but I do hear something noticeable when there's a
signal there. And at a more realistic 38 WPM, sending actual code, I can
tell *immediately* when there's something on frequency. Wayne tells me that
he has a few more tricks up his sleeve that can make it better yet, but
it's already among the best QSK setups I've ever experienced. Way to go,
Elecraft!

/Rick N6XI

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Rick Tavan
Truckee and Saratoga, CA