On Thu,12/22/2016 3:59 AM, Bill W4ZV wrote:
Another reason to run higher voltage is improved IMD performance on SSB
transmit. Lots of info available from previous threads. I've been running
14.5 at the K3 terminals on multiple units for over 5 years with no
problems.
Bill,
IMD also affects CW. What we call CW is not "continuous wave," it is a
continuous wave that is 100% modulated by a rectangular wave. That
rectangular wave is rich in harmonics, and excites IMD. We hear it as
clicks. This can be clearly seen on slides 8-16 of
http://k9yc.com/P3_Spectrum_Measurements.pdf Slides 8, 9,and11 show the
spectrum of a real "continuous wave" -- that is, a steady, unkeyed
carrier. Slides 14-16 show the spectrum of dits at about 30 wpm. The
difference is the keying sidebands, and those humps down below -50 dBC
are IMD.
73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
