On 6/8/2020 7:59 AM, Jeff Blaine wrote:
Don't stop there Jim, maybe you could provide a supplemental list that
specifically calls out the rigs that are acceptable in this respect. And
perhaps your objective metric that provides the dividing line between
good and bad.
With what funding? Isn't that the job of our organizations like ARRL and
RSGB?
So far, you state the FT2K as belonging in the "bad" (replace) category,
On the basis of 6 msec being the slowest possible rise time. That's not
one of the rigs in my 2014 analysis of ARRL Lab data. The radios I chose
to compare were those used at the recent WRTC and then popular at lower
cost.
and from prior statements on the topic, the K3 falls in the "good"
category. Lot of other radios out there needing your judgement and
owners needing your advice.
All of the Elecraft rigs since 2008 are "good" from a keying bandwidth
point of view. They achieve rise time of about 2.5 msec, but without the
clicks of the simpler "time-constant" keying of the other rigs, and
they've said that the new K4 uses the same technique. Although I haven't
been able to get one to measure, it's my understanding that Flex
6000-series adopted shaping inspired by the Elecraft method, but not
before ARRL Labs tested one that wasn't at all good. There are a lot of
those radios in use by contesters, and I've yet to hear clicks from them.
73, Jim K9YC
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