[Elecraft] [K3] Help with K3, TenTec TITAN amp, and QSK

[Steve Ellington]

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
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Paul Christensen" <w9ac at arrl.net>
To: <elecraft at 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
>
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