On Sun,8/30/2015 8:22 PM, Scott Manthe wrote:
Again, the Sherwood TX IMD test that is the basis of the eHam thread is almost 7 years old.
Study k9yc.com/TXNoise.pdf which is a comparison of ARRL LAb testing of popular transceivers, including the K3. Occupied bandwidth of a CW signal is an excellent test of IMD, because CW is 100% modulation of a carrier by a square wave, whose infinite harmonics excite IMD. The K3 is the cleanest of all rigs tested, and it isn't close.
IMD in a K3 is highest at its highest power setting, and is also highest with low DC power supply voltage. Unlike many other popular rigs, IMD in the K3 gets even better at reduced output power. Most of the better power amps require drive power in the range of 30-50 watts, and having a clean signal matters most when you're loud in the other guy's RX. :)
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 arch...@mail-archive.com
