Paul Have you noticed that the sidetone in the K3 sounds slightly heavier than what is actually transmitted? In fact it's a little annoyingly heavy.
Steve Ellington n...@carolina.rr.com ----- Original Message ----- From: "Paul Christensen" <w...@arrl.net> To: <elecraft@mailman.qth.net> Sent: Wednesday, April 15, 2009 1:50 PM Subject: Re: [Elecraft] [K3] Help with K3, TenTec TITAN amp, and QSK >> The K3's internal keyer does have a weight control which varies the >> dot:space ratio. This is not the same as the Logikey's K parameter, >> because the K lengthens the >> elements by a constant amount regardless of speed (the Logikey also has a >> weight adjustment if you wish). > > Same here. I use a microHam CW Keyer with K = 3 to compensate for a > slight > bit of "dit shortening" with the K3. The dit shortening is less > problematic > in the "Old QSK" versus the "New QSK" menu mode. I would love to see > variable K compensation added to the K3 that would function on both the > internal keyer as well as an external keyer. Adjustable rise/fall CW > would > be a very welcome addition at say 4 ms to 8 ms in 2 ms increments. > > Part of the issue is in determining how to calculate the rise & fall time > of > the keyed envelope. This becomes more critical as CW rise/fall times > lengthen. Myself, I would calculate the keyed element length by > referencing > the mid-point of the slope. K compensation would then be added or > subtracted from there. > > If you calculate the keyed element length at the point where the CW RF > waveform just begins to rise and continuing all the way to the point where > it has completed falling to zero, then the K3 is dead-on when referencing > an > external keyed closure. But, that's not a practical method of determining > keyed waveform duration with a raised cosine slope. Again, referencing > the > rise/fall points mid-slope is probably the best compromise with ramped > up/down keying. If we had that control, we could then put our keyers back > to K = 0 where they really belong. > > Paul, W9AC > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
