[Elecraft] Scope Pic - K2 Keying Envelope

Tue Feb 4 15:04:01 2003

I'll add that I get frequent comments regarding the keying of my K2, all 
favorable, indeed ecstatic.  Many people claim they can tell a K2 from its 
keying.  I've never heard that the break required a smooth (i.e., twice 
continuously differentiable) shaping to avoid clicks, merely that it not be 
too abrupt.  The shaping on make is more important.  Anyway, I'm more than 
happy.  Meanwhile, that sure was an impressive pic of the wave shape, John. 
Thanks.

best wishes,

dave belsley, w1euy

--On Tuesday, February 4, 2003 11:06 AM -0800 Eric Swartz WA6HHQ - Elecraft 
<[email protected]> wrote:

> Hi Steve,
>
> We actually did extensive testing on the K2's TX bandwidth versus keying
> wave shape during the design of the K2. The trailing edge as shown does
> not cause any noticeable key clicks. Wayne and I are both active CW ops
> and we -hate- key clicks :^). We control the wave shape in firmware and
> in hardware, so any user modification is likely to cause a degradation in
> performance.
>
> In addition to our excellent CW wave shape we made sure the PLL is
> totally stable before enabling or disabling the transmit path. Many other
> rigs are still stabilizing when their circuitry transitions to/from TX,
> causing additional transmit artifacts. The K2 is very clean in this
> regard.
>
> 73, Eric   WA6HHQ
> Elecraft
>
> ======
> Steven Gibbs wrote:
>> WD1V has posted a fine image of the K2 keying envelope.
>>
>> The K2 is good on the leading edge (rise), but less
>> than perfect on the trailing edge (fall) when there is
>> an abrupt transition when the power is still high.
>
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----------------------------------
David A. Belsley
Professor of Economics