++++++++++++++++++++ Date: Tue, 4 Feb 2003 09:58:59 -0500 To: elecraft at mailman.qth.net From: John Seney Subject: [Elecraft] Scope Pic - K2 Keying Envelope Everyone knows K2 rigs hear great and sound great. It should come as no surprise that on scope screens, K2s also look great! Here is a link to a really gorgeous K2 Keying Envelope created with a high performance digital scope using deep (24 Million Sample) deep memory. http://www.qsl.net/wd1v/LECROY.JPEG 72/73 John Seney, WD1V [FN42] QRP ARCI 10345 K2 #1388 FIST #5014 CC: 1151 http://www.qsl.net/wd1v HP Velo Recumbent Biker ++++++++++++++++++++ Date: Tue, 04 Feb 2003 15:01:47 -0500 From: "David A. Belsley" To: Eric Swartz WA6HHQ - Elecraft , Steven Gibbs Cc: elecraft at mailman.qth.net, John Seney Subject: Re: [Elecraft] Scope Pic - K2 Keying Envelope 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 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. ++++++++++++++++++