Thanks for the data, Jim (and Victor) - Even though it significantly pre-dates the IC-7300, I respect your work and will assume it has relevance.
So I am resetting the CW Rise Time to 8ms ... its slowest setting. That being said, I so seldom use CW it's pretty much a non-issue for me. 73 Lyn, WØLEN -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Thursday, July 28, 2022 2:55 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA-500 timing settings IC-7300 On 7/27/2022 12:08 PM, Lyn Norstad wrote: > CW Rise Time set to the default, 4ms (range 2ms - 8ms). This is MUCH too fast, very clicky. Even the slowest is much too clicky. See my analysis of ARRL Lab Test results done in 2014. This is all THEIR data, that they sent me in electronic form. http://k9yc.com/TXNoise.pdf Kenwood is the cleanest of the JA transceivers, but the cleanest ones by a lot are Elecraft K3 and later, where they developed non-adjustable keying which Wayne has describes as "sigmoidal" or "raised cosine" shaping. He introduced it in 2007; Flex 6000 series when tested by ARRL (after my report) was pretty nasty, but they subsequently followed Elecraft's lead and got a LOT cleaner. What we CALL CW is really 100% amplitude modulation of a carrier by a rectangular wave train, and the harmonics from the transition excite IMD that is heard as clicks. I demonstrated this in another report presented using Power Point, but not intented as a Power Point talk. It's simply a convenient way of presenting the data. http://k9yc.com/FTDX5000_Report.pdf Slide 13 shows the unmodulated carrier, slide 14 shows an FTDX5000 sending dits at roughly 30 wpm. I purposely leaked an early version of this report to someone I suspected would make sure that Yaesu saw it. Within days of my publishing it, Yaesu released the firmware update documented by later slides. The only reason for giving hams adjustable rise time is MARKETING! BTW -- there are other very slick elements of Wayne's designs that drastically reduce their transmitted and received phase noise, most of which date back to 2007 in the earliest K3. You can see my earlier measurements of a neighbor's 7600 as he varied rise time. He's a GOOD neighbor; I have another with a 7600 who, for years, chewed up 10-20 kHz of the band on CW; K6XX and I, both running a K3 legal limit, 3 miles apart, can work within 500 Hz of each other and hear each other as simply another loud signal. These data are with the original K3, long before the improved synth board. 73, Jim K9YC 73, Jim K9YC 73, Jim K9YC ______________________________________________________________ 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 Message delivered to l...@lnainc.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
