[CQ-Contest] WPX CW Signal Quality Concerns
k9yc at audiosystemsgroup.com
Mon Jun 8 16:12:09 EDT 2020
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
> 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
> 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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