So now we have a 2 ms claim for the K3. I know I measured it to 5 ms but this was something like 2 years ago.
What is it? Can Elecraft please tell. And yes dynamic testing of SSB IMD is the only way to go when dealing with a ALC/AGC controlled TX. Jim SM2EKM ---------------- On 2010-12-03 15:08, Paul Christensen wrote: > 4 ms. Given that the FTdx5K rise/fall is roughly double the time of the > K3 -- and that the K3 at 2 ms consumes significantly less bandwidth than the > FTdx5K at 4 ms, the CW transmit quality of the K3 is far superior. I would > like to hear QSK on the Yaesu, compare it with the K3's QRQ mode, and note > any audible artifacts in the headphones -- especially for signs of clicks > and DC thumps. > > Referring to the December, 2010 QST Product Review on p.45, take a look at > the leading edge of the second pulse (lower trace) in Figure 1. The sharp > rise and sharp edge at the top of the waveform is what is consuming the > bandwidth. Based on that waveform, it was absolutely generating clicks at > some distance from the Fc. That pattern is characteristic of a deficient > ALC system. > > A deficiency in the ALC system then takes us into SSB Tx IMD. The published > FTdx5K Tx IMD numbers look great with the ARRL's steady tone method but > arguably, that's probably more relevant to data modes. The question is > "what is the FTdx5K's ALC doing to undermine the rig's otherwise excellent > SSB Tx IMD numbers, especially in Class A?" Really, the published Tx IMD > figures are meaningless unless dynamic testing is conducted to simulate > rapid changes in power associated with voice modes. > > Paul, W9AC > > ----- Original Message ----- > From: "Jan Erik Holm"<sm2...@telia.com> > To:<elecraft@mailman.qth.net> > Sent: Friday, December 03, 2010 8:27 AM > Subject: Re: [Elecraft] Fwd: New Sherwood report > > >> Yes but to what rise/fall time was the radio set? AFAIK in >> the FT5000 it can be changed. >> >> /Jim SM2EKM > > ______________________________________________________________ > 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
